From xen-announce-bounces@lists.xen.org Thu Oct 12 12:17:48 2017 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Thu, 12 Oct 2017 12:17:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPr-0007PP-79; Thu, 12 Oct 2017 12:16:43 +0000 Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPo-0007Mu-Pc; Thu, 12 Oct 2017 12:16:41 +0000 Received: from [193.109.254.147] by server-2.bemta-6.messagelabs.com id 29/0C-16487-72D5FD95; Thu, 12 Oct 2017 12:16:39 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpml+JIrShJLcpLzFFi42LJaLquqqsWez/ SYMolbotbN1uZLZZ8XMxiserqAVYHZo+ju38zBTBGsWbmJeVXJLBmdL/+x1Lw+ClPRfuWS8wN jCuP8nQxcnEICVxhlPh+7BgzhLOIUeL0xruMXYycHMwCrhI39m1mg7AVJS7ca2ABsXkFBCVOz nwCZksIaErcebOKHcQWESiS2HnuJZjNJqAnMffsJCaIXkuJ+RNPgc0RFgiXOP3hMdQcM4mpjR /AbBYBVYk7C/8yT2DkmYVk9Swkq2chWT2LkQMorimxfpc+hCktsfwfB0S1vMT2t3OYIWwribU r5jFB2OYSiw/9Y4KZOKX7ITtEa41E2y1FiHClxLebDxhRlUDEp97vhDqmTGLf6mPMmGrKJX50 bIQaXyJxa0UzFjUlErOenGSFsAslVvRMYMdmztLV/5lh6o+/es6CzZxz/xuZYOZs/fIXi5vLJ Xr27WCFqX+4aT8TNnO+9T1lhARDoUTHAYUFjLqrGDWKU4vKUot0Dc31kooy0zNKchMzc3QNDc z0clOLixPTU3MSk4r1kvNzNzECEyEDEOxgvL0x4BCjJAeTkihvRuD9SCG+pPyUyozE4oz4otK c1OJDjDIcHEoSvPeigXKCRanpqRVpmTnAlAyTluDgURLhfQeS5i0uSMwtzkyHSJ1itOQ4tuLi HyaONfOuA8mOm3f/MAmx5OXnpUqJ884GaRAAacgozYMbB8sblxhlpYR5GYEOFOIpSC3KzSxBl X/FKM7BqCTMexlkCk9mXgnc1ldABzEBHSSadgfkoJJEhJRUA+O0A1OzT5s1ZChouO5aoXRFMd h6e5TKqphe4ZcZ7vM5dx67zRNdIBggvLvwF09p9ru+eY7rZ9R0vMqLdPcVbYu4f/18nuGJtCP 13xw2KEsKfmx3rmlfwVk9acH+z5Xlfg7yq34vlVq9eYFH36sc8cZ3a9arCirFHNPISuCP89jz MeeN/INvq5RYijMSDbWYi4oTAUVraLkWBAAA X-Env-Sender: aliasfile-bounces@xenproject.org X-Msg-Ref: server-12.tower-27.messagelabs.com!1507810596!109893695!1 X-Originating-IP: [104.130.215.37] X-SpamReason: No, hits=0.0 required=7.0 tests= X-StarScan-Received: X-StarScan-Version: 9.4.45; banners=-,-,- X-VirusChecked: Checked Received: (qmail 35985 invoked from network); 12 Oct 2017 12:16:37 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-12.tower-27.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 12 Oct 2017 12:16:37 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPc-0000fS-Vg; Thu, 12 Oct 2017 12:16:28 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e2cPc-00079i-UW; Thu, 12 Oct 2017 12:16:28 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 12 Oct 2017 12:16:28 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 240 - Unlimited recursion in linear pagetable de-typing X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-240 version 3 Unlimited recursion in linear pagetable de-typing UPDATES IN VERSION 3 ==================== Re-base unstable patch to avoid it applying only with fuzz. Public release. ISSUE DESCRIPTION ================= x86 PV guests are permitted to set up certain forms of what is often called "linear page tables", where pagetables contain references to other pagetables at the same level or higher. Certain restrictions apply in order to fit into Xen's page type handling system. An important restriction was missed, however: Stacking multiple layers of page tables of the same level on top of one another is not very useful, and the tearing down of such an arrangement involves recursion. With sufficiently many layers such recursion will result in a stack overflow, commonly resulting in Xen to crash. IMPACT ====== A malicious or buggy PV guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Privilege escalation and information leaks cannot be excluded. VULNERABLE SYSTEMS ================== All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been checked. Only x86 systems are affected. ARM systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM guests cannot leverage the vulnerability. MITIGATION ========== Running only HVM guests will avoid this vulnerability. For PV guests, the vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Jann Horn of Google Project Zero. RESOLUTION ========== Applying the appropriate attached patch series resolves this issue. The first patch fixes this known issue. The second patch in each series disables the `linear pagetable` option by default. It can be re-enabled by adding "pv-linear-pt=true' on the Xen command-line. Note that neither Linux nor MiniOS use linear pagetables; NetBSD and Novell Netware, however, do use this feature when running in PV mode. xsa240-unstable/*.patch xen-unstable xsa240-4.9/*.patch Xen 4.9.x xsa240-4.8/*.patch Xen 4.8.x xsa240-4.7/*.patch Xen 4.7.x xsa240-4.6/*.patch Xen 4.6.x xsa240-4.5/*.patch Xen 4.5.x $ sha256sum xsa240* xsa240*/* 6ad3f6c7817496d11d846ac551d8b37fc73daf488eaa1cda614eb3b5a34f858d xsa240.meta e227126ea204d6049c8bfb694e3d2bcac10382733ca4ece1f0f7dc36c625ac1d xsa240-unstable/0001-x86-limit-linear-page-table-use-to-a-single-level.patch c6bb1f47754bf4f57bb9205509c525336ff55da8bcae8ae95415bdf1bba70209 xsa240-unstable/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch 2e8168449f8594c5faa50feb311eaa7e74b38c726853b1cfbaf2fbd4cbbdb476 xsa240-4.5/0001-x86-limit-linear-page-table-use-to-a-single-level.patch ea95ed56a5f85753a41ca1abbb4abd5ea791d7596c8a9d20ceaa53862ee5ce15 xsa240-4.5/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch f7556cc4a13cd4334d79e73861f15dd619dfd6041a3ad89865b358035d2fcff8 xsa240-4.6/0001-x86-limit-linear-page-table-use-to-a-single-level.patch 24ad9f92938c112a6fcf46177d44597c49dc213a3644ce4fd59d4df507b072d3 xsa240-4.6/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch 5a9b8e0a4e55482826e6cf820ea01fbf6674fecf19b101f4578396e3fa98a8fd xsa240-4.7/0001-x86-limit-linear-page-table-use-to-a-single-level.patch acf9744b853c1c6ac071bcf5776d8d9463781bbdf658c2fecc59ee338c094750 xsa240-4.7/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch c0c624f51fb1bd9e31a2c120343164d545ab6e709ed4bb9e5dd89b5c4c4e49f8 xsa240-4.8/0001-x86-limit-linear-page-table-use-to-a-single-level.patch 7e3c2c4a4d0ee0a29abaa7aceffbb774b1f92aa81dfa4c5d1c5c5156b6bb0a3a xsa240-4.8/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch 7769866805e47b7a2109ba1778f263ddfa126bcb0b116612f76dfaca9bf70995 xsa240-4.9/0001-x86-limit-linear-page-table-use-to-a-single-level.patch 1053cb348dc8536cb12b4aca556ddc4c015810f8f0fd21a80dff37433ec082ea xsa240-4.9/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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server-5.tower-21.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 12 Oct 2017 12:16:54 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPk-0000h0-QU; Thu, 12 Oct 2017 12:16:36 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e2cPk-0007GA-Pi; Thu, 12 Oct 2017 12:16:36 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 12 Oct 2017 12:16:36 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 244 - x86: Incorrect handling of IST settings during CPU hotplug X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-244 version 2 x86: Incorrect handling of IST settings during CPU hotplug UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= The x86-64 architecture allows interrupts to be run on distinct stacks. The choice of stack is encoded in a field of the corresponding interrupt descriptor in the Interrupt Descriptor Table (IDT). That field selects an entry from the active Task State Segment (TSS). Since, on AMD hardware, Xen switches to an HVM guest's TSS before actually entering the guest, with the Global Interrupt Flag still set, the selectors in the IDT entry are switched when guest context is loaded/unloaded. When a new CPU is brought online, its IDT is copied from CPU0's IDT, including those selector fields. If CPU0 happens at that moment to be in HVM context, wrong values for those IDT fields would be installed for the new CPU. If the first guest vCPU to be run on that CPU belongs to a PV guest, it will then have the ability to escalate its privilege or crash the hypervisor. IMPACT ====== A malicious or buggy x86 PV guest could escalate its privileges or crash the hypervisor. VULNERABLE SYSTEMS ================== All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been checked. Only PV guests can exploit the vulnerability. HVM guests cannot exploit the vulnerability, but their presence is necessary for the exposure of the vulnerability to PV guests. Only x86 systems using SVM (AMD virtualisation extensions) rather than VMX (Intel virtualisation extensions) are vulnerable. Therefore AMD x86 hardware is vulnerable; Intel hardware is not vulnerable. ARM systems are not vulnerable. MITIGATION ========== Avoiding to online CPUs at runtime will avoid this vulnerability. Running only HVM or only PV guests on any individual host will also avoid this vulnerability. CREDITS ======= This issue was discovered by Andrew Cooper of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa244.patch xen-unstable, Xen 4.9.x, Xen 4.8.x xsa244-4.7.patch Xen 4.7.x xsa244-4.6.patch Xen 4.6.x xsa244-4.5.patch Xen 4.5.x $ sha256sum xsa244* 5b663620a1b0d5f07e7ae4d1d3506d925515d5f85830ca49dda75cab1218506f xsa244.meta bcf22b332bf3f6fe8c86e4de67f82628c9b8e257d9513c3bf5c7f5dd71d86c33 xsa244.patch 4c4543fdfd25b4a8ea7d53f3f45011ec137798e7d4e690d8f3ea58d77afb5f06 xsa244-4.5.patch eaa3ba303980d783813db7aee948a9cb2723328da5fa5650ffca7b825c21bab6 xsa244-4.6.patch 4d8cf754f760ef05488e9fb25a7ebd9a7e46f3742e91eee1a8385fd1e611ea8c xsa244-4.7.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 23955 invoked from network); 12 Oct 2017 12:16:42 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-14.tower-31.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 12 Oct 2017 12:16:42 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPi-0000ga-SA; Thu, 12 Oct 2017 12:16:34 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e2cPi-0007Ea-RQ; Thu, 12 Oct 2017 12:16:34 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 12 Oct 2017 12:16:34 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 243 - x86: Incorrect handling of self-linear shadow mappings with translated guests X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-243 version 3 x86: Incorrect handling of self-linear shadow mappings with translated guests UPDATES IN VERSION 3 ==================== Public release. ISSUE DESCRIPTION ================= The shadow pagetable code uses linear mappings to inspect and modify the shadow pagetables. A linear mapping which points back to itself is known as self-linear. For translated guests, the shadow linear mappings (being in a separate address space) are not intended to be self-linear. For non-translated guests, the shadow linear mappings (being the same address space) are intended to be self-linear. When constructing a monitor pagetable for Xen to run on a vcpu with, the shadow linear slot is filled with a self-linear mapping, and for translated guests, shortly thereafter replaced with a non-self-linear mapping, when the guest's %cr3 is shadowed. However when writeable heuristics are used, the shadow mappings are used as part of shadowing %cr3, causing the heuristics to be applied to Xen's pagetables, not the guest shadow pagetables. While investigating, it was also identified that PV auto-translate mode was insecure. This mode was removed in Xen 4.7 due to being unused, unmaintained and presumed broken. We are not aware of any guest implementation of PV auto-translate mode. IMPACT ====== A malicious or buggy HVM guest may cause a hypervisor crash, resulting in a Denial of Service (DoS) affecting the entire host, or cause hypervisor memory corruption. We cannot rule out a guest being able to escalate its privilege. VULNERABLE SYSTEMS ================== All versions of Xen are vulnerable. HVM guests using shadow mode paging can exploit this vulnerability. HVM guests using Hardware Assisted Paging (HAP) as well as PV guests cannot exploit this vulnerability. ARM systems are not vulnerable. MITIGATION ========== Running only PV guests will avoid this vulnerability. Where the HVM guest is explicitly configured to use shadow paging (eg via the `hap=0' xl domain configuration file parameter), changing to HAP (eg by setting `hap=1') will avoid exposing the vulnerability to those guests. HAP is the default (in upstream Xen), where the hardware supports it; so this mitigation is only applicable if HAP has been disabled by configuration. CREDITS ======= This issue was discovered by Andrew Cooper of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa243.patch xen-unstable, Xen 4.9.x xsa243-4.8.patch Xen 4.8.x xsa243-4.7.patch Xen 4.7.x xsa243-4.6-[1,2].patch Xen 4.6.x xsa243-4.{6-1,5-2}.patch Xen 4.5.x $ sha256sum xsa243* 61b05e2d6655f5d18cd53b16e03499152c603162584f64d68fad31b088cc5cd2 xsa243.meta a5b484db80346f7e75c7921ee4780567f04b9f9b4620c0cde4bfa1df3ac0f87f xsa243.patch 79e1c5e088eee8e78aa67895a29d611352c64251854e4c5129e33c85988a47a5 xsa243-4.5-2.patch 722073aad1e734e24b0b79d03a1957e491f3616fe6e244a89050f7a50f8f356b xsa243-4.6-1.patch 94cb346c486f88f2f4f701564017e1997e518a5a14218f0e38ff882c60fb382c xsa243-4.6-2.patch 465ba9e3293591a3c84c122ffd73474fe96483f5e21565440d5fbc207fa4c4a9 xsa243-4.7.patch f8e471b42502905a442d43934ac339663a6124118c9762b31f2ad930fd532e64 xsa243-4.8.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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tests= X-StarScan-Received: X-StarScan-Version: 9.4.45; banners=-,-,- X-VirusChecked: Checked Received: (qmail 65305 invoked from network); 12 Oct 2017 12:16:44 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-14.tower-27.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 12 Oct 2017 12:16:44 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPg-0000g7-S5; Thu, 12 Oct 2017 12:16:32 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e2cPg-0007Ct-RO; Thu, 12 Oct 2017 12:16:32 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 12 Oct 2017 12:16:32 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 242 - page type reference leak on x86 X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-242 version 2 page type reference leak on x86 UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= The page type system of Xen requires cleanup when the last reference for a given page is being dropped. In order to exclude simultaneous updates to a given page by multiple parties, pages which are updated are locked beforehand. This locking includes temporarily increasing the type reference count by one. When the page is later unlocked, the context precludes cleanup, so the reference that is then dropped must not be the last one. This was not properly enforced. IMPACT ====== A malicious or buggy PV guest may cause a memory leak upon shutdown of the guest, ultimately perhaps resulting in Denial of Service (DoS) affecting the entire host. VULNERABLE SYSTEMS ================== All Xen versions from 3.4 onwards are vulnerable. Xen versions 3.3 and earlier are not vulnerable. Only x86 systems are affected. ARM systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM guests cannot leverage the vulnerability. MITIGATION ========== Running only HVM guests will avoid this vulnerability. For PV guests, the vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Jan Beulich of SUSE. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa242.patch xen-unstable xsa242-4.9.patch Xen 4.9.x, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x, Xen 4.5.x $ sha256sum xsa242* 168db3aef00806025afa255dee35cd0c042706a27a0256744e4d63f3ee86a2e8 xsa242.meta 16848f71311c2fd6a38afd7602e59211c89a3daf29b874097dba0b1e31ba6eec xsa242.patch 5e66b6b1d1cd400905d3abd3478144539c3afa24f5a744a11809d9c5eb517b98 xsa242-4.9.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 4027 invoked from network); 12 Oct 2017 12:16:41 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-10.tower-27.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 12 Oct 2017 12:16:41 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPe-0000fp-UQ; Thu, 12 Oct 2017 12:16:30 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e2cPe-0007BF-Tb; Thu, 12 Oct 2017 12:16:30 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 12 Oct 2017 12:16:30 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 241 - Stale TLB entry due to page type release race X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-241 version 3 Stale TLB entry due to page type release race UPDATES IN VERSION 3 ==================== Fix ARM build issue in patches. Public release. ISSUE DESCRIPTION ================= x86 PV guests effect TLB flushes by way of a hypercall. Xen tries to reduce the number of TLB flushes by delaying them as much as possible. When the last type reference of a page is dropped, the need for a TLB flush (before the page is re-used) is recorded. If a guest TLB flush request involves an Inter Processor Interrupt (IPI) to a CPU in which is the process of dropping the last type reference of some page, and if that IPI arrives at exactly the right instruction boundary, a stale time stamp may be recorded, possibly resulting in the later omission of the necessary TLB flush for that page. IMPACT ====== A malicious x86 PV guest may be able to access all of system memory, allowing for all of privilege escalation, host crashes, and information leaks. VULNERABLE SYSTEMS ================== All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been checked. Only x86 systems are affected. ARM systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM guests cannot leverage the vulnerability. RISK ASSESSMENT =============== A successful attack would require introducing an extended delay between two adjacent operations on one cpu -- long enough for two hypercalls to complete on another cpu. The security team currently has no proof-of-concept for this vulnerability. However, techniques for these sorts of timing-based attacks are continually advancing, so we still recommend users potentially affected by this issue apply the patch as soon as reasonably possible. MITIGATION ========== Running only HVM guests will avoid this vulnerability. For PV guests, the vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Jann Horn of Google Project Zero. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa241.patch xen-unstable xsa241-4.9.patch Xen 4.9.x xsa241-4.8.patch Xen 4.8.x, Xen 4.7.x, Xen 4.6.x, Xen 4.5.x $ sha256sum xsa241* 5e239ba4dbd74fd61e59a27f9abc8ea6ba32532bdf81eeb2d7e66f0fd53e40b4 xsa241.meta b8db933d53e7e289652ffda6c46ce284a0254a9f8bc9e1be6793e388009f49ce xsa241.patch 443a5b0818045ada44fad0370ac01af0c96181be5a4078ae3b2575799e4a4e5b xsa241-4.8.patch 927ef14d875556481c38d4065f501211a78eec1c2396a954a4a4abfb9255960f xsa241-4.9.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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xen-announce-bounces@lists.xen.org Thu Oct 12 12:17:48 2017 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Thu, 12 Oct 2017 12:17:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cQk-00009d-VM; Thu, 12 Oct 2017 12:17:38 +0000 Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cQk-00008c-5T; Thu, 12 Oct 2017 12:17:38 +0000 Received: from [85.158.143.35] by server-9.bemta-6.messagelabs.com id FE/CE-30115-16D5FD95; Thu, 12 Oct 2017 12:17:37 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrPKsWRWlGSWpSXmKPExsWS0XRdVTch9n6 kwafJXBa3brYyWyz5uJjFYtXVA6wOzB5Hd/9mCmCMYs3MS8qvSGDNOHP5IGvB0rSKlz92Mjcw bk7oYuTiEBK4wiixqPEvC4SziFHix9nZQA4nB7OAq8SNfZvZIGxFiQv3GsDivAKCEidnPgGzJ QQ0Je68WcUOYosIFEnsPPcSzGYT0JOYe3YSE0SvpcT8iafA5ggLeEvsuP2OsYuRA2iOmcTt+w 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invoked from network); 12 Oct 2017 12:17:35 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-5.tower-21.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 12 Oct 2017 12:17:35 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPY-0000ep-7X; Thu, 12 Oct 2017 12:16:24 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e2cPY-000765-3B; Thu, 12 Oct 2017 12:16:24 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 12 Oct 2017 12:16:24 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 238 - DMOP map/unmap missing argument checks X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-238 version 2 DMOP map/unmap missing argument checks UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= DMOPs (which were a subgroup of HVMOPs in older releases) allow guests to control and drive other guests. The I/O request server page mapping interface uses range sets to represent I/O resources the emulation of which is provided by a given I/O request server. The internals of the range set implementation require that ranges have a starting value no lower than the ending one. Checks for this fact were missing. IMPACT ====== Malicious or buggy stub domain kernels or tool stacks otherwise living outside of Domain0 can mount a denial of service attack which, if successful, can affect the whole system. Only domains controlling HVM guests can exploit this vulnerability. (This includes domains providing hardware emulation services to HVM guests.) VULNERABLE SYSTEMS ================== Xen versions 4.5 and later are vulnerable. Xen versions 4.4 and earlier are not vulnerable. Only x86 systems are affected. ARM systems are not affected. This vulnerability is only applicable to Xen systems using stub domains or other forms of disaggregation of control domains for HVM guests. MITIGATION ========== Running only PV guests will avoid this issue. (The security of a Xen system using stub domains is still better than with a qemu-dm running as an unrestricted dom0 process. Therefore users with these configurations should not switch to an unrestricted dom0 qemu-dm.) CREDITS ======= This issue was discovered by Vitaly Kuznetsov of RedHat. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa238.patch xen-unstable, Xen 4.9.x, Xen 4.8.x, Xen 4.7.x xsa238-4.6.patch Xen 4.6.x xsa238-4.5.patch Xen 4.5.x $ sha256sum xsa238* 3cced09a1fb2936644d654c568f38580952328b84e28601b019ea74122228c36 xsa238.meta 85d3f9713bef1bc86c682857dbd7388a1d1f20089363ddfc4cb9ecbd88eaffec xsa238.patch 034e91c234f6831dbaa1aaf29f4f90de2e822f99301424f7f3527f9da883ff68 xsa238-4.5.patch 29255a81729b24866e594426167de5fbef70de21ef62a95ba95de191d2a7fd54 xsa238-4.6.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 40052 invoked from network); 12 Oct 2017 12:16:37 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-12.tower-206.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 12 Oct 2017 12:16:37 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2cPS-0000eZ-RW; Thu, 12 Oct 2017 12:16:18 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e2cPS-00073d-OP; Thu, 12 Oct 2017 12:16:18 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 12 Oct 2017 12:16:18 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 237 - multiple MSI mapping issues on x86 X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-237 version 2 multiple MSI mapping issues on x86 UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Multiple issues exist with the setup of PCI MSI interrupts: - - unprivileged guests were permitted access to devices not owned by them, in particular allowing them to disable MSI or MSI-X on any device - - HVM guests can trigger a codepath intended only for PV guests - - some failure paths partially tear down previously configured interrupts, leaving inconsistent state - - with XSM enabled, caller and callee of a hook disagreed about the data structure pointed to by a type-less argument IMPACT ====== A malicious or buggy guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Privilege escalation and information leaks cannot be excluded. VULNERABLE SYSTEMS ================== All Xen versions from at 3.3 onwards are vulnerable. Xen versions 3.2 and earlier are not vulnerable. Only x86 systems are affected. ARM systems are not affected. Only guests which have a physical device assigned to them can exploit the vulnerability. MITIGATION ========== Not passing through physical devices to untrusted guests will avoid the vulnerability. The vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Simon Gaiser of Qubes OS Project. RESOLUTION ========== Applying the appropriate attached set of patches resolves this issue. xsa237-unstable/*.patch xen-unstable xsa237-4.9/*.patch Xen 4.9.x xsa237-4.8/*.patch Xen 4.8.x, Xen 4.7.x xsa237-4.6/*.patch Xen 4.6.x xsa237-4.5/*.patch Xen 4.5.x $ sha256sum xsa237* xsa237*/* 1d4d3fa452e91d235fd688761d695752bde2f2e91fd9b17f566c4cee23ae26d0 xsa237.meta 3259cd514ea80e3cbac5b72376b4e964afb3b2cabee347440ec2bdd6e585c513 xsa237-unstable/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch 7ef53f6a5f3fc6952cb8411e31e0a670de5a78ab2c8176037db32cf147438aa6 xsa237-unstable/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 494a79332fc5f854f0dc7606669201717a41e5b89b44db2fb30607a326930bfb xsa237-unstable/0003-x86-MSI-disallow-redundant-enabling.patch 503b58512c5336aff9692c0d0768f38ee956c0988fa3fad4d439f13814736e06 xsa237-unstable/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch dc5f27245e44582db682ac53f24007685ea2f8cb104bad9b4d6afeaa7c4e73d2 xsa237-unstable/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch cd9cd248c4564552bbe847462d247b78ff6af1052198e6b6529178a8a624e1f6 xsa237-4.5/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch 87bbb240323b3cce9767da73961d58436c436db6da614c62ade7640f87f748dd xsa237-4.5/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 6a2e6772fa7b7a1683f7b1041f06757562622228635aedb8c760ebcd9ad0ff7a xsa237-4.5/0003-x86-MSI-disallow-redundant-enabling.patch c558ca347b6df9b430fbdaf9c9b8e3b203c273be1e2bb01aa3424773b88df91d xsa237-4.5/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch 60169e2016451e1c479c4f873ee6798b6abc46e3223a60a4b83bac20a7a3d27c xsa237-4.5/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch cd9cd248c4564552bbe847462d247b78ff6af1052198e6b6529178a8a624e1f6 xsa237-4.6/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch d39d1c0eaf2ba169b6596520b05930d280721c397fafa3414b6da6168e8b73ca xsa237-4.6/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 494a79332fc5f854f0dc7606669201717a41e5b89b44db2fb30607a326930bfb xsa237-4.6/0003-x86-MSI-disallow-redundant-enabling.patch c558ca347b6df9b430fbdaf9c9b8e3b203c273be1e2bb01aa3424773b88df91d xsa237-4.6/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch 4cdcd71758d9e5b392c38aeafc9960a4f3ef5c109508e69b2218a8d8394edf0b xsa237-4.6/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch 1ae6aefb86ba0c48a45ecc14ff56ea0bc3d9d354937668bcacadaed1225017a8 xsa237-4.8/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch bf2ca9cb99ee64d7db77d628cec1a84684c360fd36de433cbc78fbcde8095319 xsa237-4.8/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 494a79332fc5f854f0dc7606669201717a41e5b89b44db2fb30607a326930bfb xsa237-4.8/0003-x86-MSI-disallow-redundant-enabling.patch 9a38899afd728d504382954de28657aa82af7da352eb4e45a5e615bd646834c5 xsa237-4.8/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch fef5c77f19e2c6229912f1fd19cbcb41c1ce554ff53be22198b2f34ea7a27314 xsa237-4.8/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch c97819cdf567c9bb2c38083a941995f836d7dabe3c8bbedf2205e3996cfbce68 xsa237-4.9/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch d31a2d1053d377e7159060f24a7dbf1d5fd9ebd1f4e4556c4c16b3f409a81130 xsa237-4.9/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 494a79332fc5f854f0dc7606669201717a41e5b89b44db2fb30607a326930bfb xsa237-4.9/0003-x86-MSI-disallow-redundant-enabling.patch f8d8c9f70b22d735960393bce042f39caaaf12e42344394e6078461437fa39aa xsa237-4.9/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch 7f3955a8218850ee2cc9ddd9d11fdc25f526d32e80e189d063e3e779d448af40 xsa237-4.9/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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(Exim 4.84_2) (envelope-from ) id 1e2cPa-00077n-Fi; Thu, 12 Oct 2017 12:16:26 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Thu, 12 Oct 2017 12:16:26 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 239 - hypervisor stack leak in x86 I/O intercept code X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-239 version 2 hypervisor stack leak in x86 I/O intercept code UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Intercepted I/O operations may deal with less than a full machine word's worth of data. While read paths had been the subject of earlier XSAs (and hence have been fixed), at least one write path was found where the data stored into an internal structure could contain bits from an uninitialized hypervisor stack slot. A subsequent emulated read would then be able to retrieve these bits. IMPACT ====== A malicious unprivileged x86 HVM guest may be able to obtain sensitive information from the host or other guests. VULNERABLE SYSTEMS ================== All Xen versions are vulnerable. Only x86 systems are affected. ARM systems are not affected. Only HVM guests can leverage this vulnerability. PV guests cannot leverage this vulnerability. MITIGATION ========== Running only PV guests will avoid this issue. CREDITS ======= This issue was discovered by Roger Pau Monné of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa239.patch xen-unstable, Xen 4.9.x, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x xsa239-4.5.patch Xen 4.5.x $ sha256sum xsa239* eb7971be89199eb3ff510f4f5650fd5a8ec588b9fcb8f89230216fac4214ef21 xsa239.meta 087a8b3cf7ecbdbde593033c127cbcf6c37f532bf33d90f72c19e493970a799c xsa239.patch b91a68fe67240f2a5bb9460c5b650e9595364afa180f8702aef783815e3d7dcd xsa239-4.5.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 19053 invoked from network); 18 Oct 2017 12:08:41 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-12.tower-206.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 18 Oct 2017 12:08:41 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n96-00062H-Jo; Wed, 18 Oct 2017 12:08:24 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e4n96-0001EB-Gx; Wed, 18 Oct 2017 12:08:24 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Wed, 18 Oct 2017 12:08:24 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 237 (CVE-2017-15590) - multiple MSI mapping issues on x86 X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15590 / XSA-237 version 3 multiple MSI mapping issues on x86 UPDATES IN VERSION 3 ==================== CVE assigned. ISSUE DESCRIPTION ================= Multiple issues exist with the setup of PCI MSI interrupts: - - unprivileged guests were permitted access to devices not owned by them, in particular allowing them to disable MSI or MSI-X on any device - - HVM guests can trigger a codepath intended only for PV guests - - some failure paths partially tear down previously configured interrupts, leaving inconsistent state - - with XSM enabled, caller and callee of a hook disagreed about the data structure pointed to by a type-less argument IMPACT ====== A malicious or buggy guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Privilege escalation and information leaks cannot be excluded. VULNERABLE SYSTEMS ================== All Xen versions from at 3.3 onwards are vulnerable. Xen versions 3.2 and earlier are not vulnerable. Only x86 systems are affected. ARM systems are not affected. Only guests which have a physical device assigned to them can exploit the vulnerability. MITIGATION ========== Not passing through physical devices to untrusted guests will avoid the vulnerability. The vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Simon Gaiser of Qubes OS Project. RESOLUTION ========== Applying the appropriate attached set of patches resolves this issue. xsa237-unstable/*.patch xen-unstable xsa237-4.9/*.patch Xen 4.9.x xsa237-4.8/*.patch Xen 4.8.x, Xen 4.7.x xsa237-4.6/*.patch Xen 4.6.x xsa237-4.5/*.patch Xen 4.5.x $ sha256sum xsa237* xsa237*/* 1d4d3fa452e91d235fd688761d695752bde2f2e91fd9b17f566c4cee23ae26d0 xsa237.meta 3259cd514ea80e3cbac5b72376b4e964afb3b2cabee347440ec2bdd6e585c513 xsa237-unstable/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch 7ef53f6a5f3fc6952cb8411e31e0a670de5a78ab2c8176037db32cf147438aa6 xsa237-unstable/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 494a79332fc5f854f0dc7606669201717a41e5b89b44db2fb30607a326930bfb xsa237-unstable/0003-x86-MSI-disallow-redundant-enabling.patch 503b58512c5336aff9692c0d0768f38ee956c0988fa3fad4d439f13814736e06 xsa237-unstable/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch dc5f27245e44582db682ac53f24007685ea2f8cb104bad9b4d6afeaa7c4e73d2 xsa237-unstable/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch cd9cd248c4564552bbe847462d247b78ff6af1052198e6b6529178a8a624e1f6 xsa237-4.5/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch 87bbb240323b3cce9767da73961d58436c436db6da614c62ade7640f87f748dd xsa237-4.5/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 6a2e6772fa7b7a1683f7b1041f06757562622228635aedb8c760ebcd9ad0ff7a xsa237-4.5/0003-x86-MSI-disallow-redundant-enabling.patch c558ca347b6df9b430fbdaf9c9b8e3b203c273be1e2bb01aa3424773b88df91d xsa237-4.5/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch 60169e2016451e1c479c4f873ee6798b6abc46e3223a60a4b83bac20a7a3d27c xsa237-4.5/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch cd9cd248c4564552bbe847462d247b78ff6af1052198e6b6529178a8a624e1f6 xsa237-4.6/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch d39d1c0eaf2ba169b6596520b05930d280721c397fafa3414b6da6168e8b73ca xsa237-4.6/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 494a79332fc5f854f0dc7606669201717a41e5b89b44db2fb30607a326930bfb xsa237-4.6/0003-x86-MSI-disallow-redundant-enabling.patch c558ca347b6df9b430fbdaf9c9b8e3b203c273be1e2bb01aa3424773b88df91d xsa237-4.6/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch 4cdcd71758d9e5b392c38aeafc9960a4f3ef5c109508e69b2218a8d8394edf0b xsa237-4.6/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch 1ae6aefb86ba0c48a45ecc14ff56ea0bc3d9d354937668bcacadaed1225017a8 xsa237-4.8/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch bf2ca9cb99ee64d7db77d628cec1a84684c360fd36de433cbc78fbcde8095319 xsa237-4.8/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 494a79332fc5f854f0dc7606669201717a41e5b89b44db2fb30607a326930bfb xsa237-4.8/0003-x86-MSI-disallow-redundant-enabling.patch 9a38899afd728d504382954de28657aa82af7da352eb4e45a5e615bd646834c5 xsa237-4.8/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch fef5c77f19e2c6229912f1fd19cbcb41c1ce554ff53be22198b2f34ea7a27314 xsa237-4.8/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch c97819cdf567c9bb2c38083a941995f836d7dabe3c8bbedf2205e3996cfbce68 xsa237-4.9/0001-x86-dont-allow-MSI-pIRQ-mapping-on-unowned-device.patch d31a2d1053d377e7159060f24a7dbf1d5fd9ebd1f4e4556c4c16b3f409a81130 xsa237-4.9/0002-x86-enforce-proper-privilege-when-mapping-pIRQ-s.patch 494a79332fc5f854f0dc7606669201717a41e5b89b44db2fb30607a326930bfb xsa237-4.9/0003-x86-MSI-disallow-redundant-enabling.patch f8d8c9f70b22d735960393bce042f39caaaf12e42344394e6078461437fa39aa xsa237-4.9/0004-x86-IRQ-conditionally-preserve-irq-pirq-mapping-on-error.patch 7f3955a8218850ee2cc9ddd9d11fdc25f526d32e80e189d063e3e779d448af40 xsa237-4.9/0005-x86-FLASK-fix-unmap-domain-IRQ-XSM-hook.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e4n9G-0001KT-1X; Wed, 18 Oct 2017 12:08:34 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Wed, 18 Oct 2017 12:08:34 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 241 (CVE-2017-15588) - Stale TLB entry due to page type release race X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15588 / XSA-241 version 4 Stale TLB entry due to page type release race UPDATES IN VERSION 4 ==================== CVE assigned. ISSUE DESCRIPTION ================= x86 PV guests effect TLB flushes by way of a hypercall. Xen tries to reduce the number of TLB flushes by delaying them as much as possible. When the last type reference of a page is dropped, the need for a TLB flush (before the page is re-used) is recorded. If a guest TLB flush request involves an Inter Processor Interrupt (IPI) to a CPU in which is the process of dropping the last type reference of some page, and if that IPI arrives at exactly the right instruction boundary, a stale time stamp may be recorded, possibly resulting in the later omission of the necessary TLB flush for that page. IMPACT ====== A malicious x86 PV guest may be able to access all of system memory, allowing for all of privilege escalation, host crashes, and information leaks. VULNERABLE SYSTEMS ================== All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been checked. Only x86 systems are affected. ARM systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM guests cannot leverage the vulnerability. RISK ASSESSMENT =============== A successful attack would require introducing an extended delay between two adjacent operations on one cpu -- long enough for two hypercalls to complete on another cpu. The security team currently has no proof-of-concept for this vulnerability. However, techniques for these sorts of timing-based attacks are continually advancing, so we still recommend users potentially affected by this issue apply the patch as soon as reasonably possible. MITIGATION ========== Running only HVM guests will avoid this vulnerability. For PV guests, the vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Jann Horn of Google Project Zero. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa241.patch xen-unstable xsa241-4.9.patch Xen 4.9.x xsa241-4.8.patch Xen 4.8.x, Xen 4.7.x, Xen 4.6.x, Xen 4.5.x $ sha256sum xsa241* 5e239ba4dbd74fd61e59a27f9abc8ea6ba32532bdf81eeb2d7e66f0fd53e40b4 xsa241.meta b8db933d53e7e289652ffda6c46ce284a0254a9f8bc9e1be6793e388009f49ce xsa241.patch 443a5b0818045ada44fad0370ac01af0c96181be5a4078ae3b2575799e4a4e5b xsa241-4.8.patch 927ef14d875556481c38d4065f501211a78eec1c2396a954a4a4abfb9255960f xsa241-4.9.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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xen-announce-bounces@lists.xen.org Wed Oct 18 12:09:26 2017 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Wed, 18 Oct 2017 12:09:26 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n9s-0008Cm-2Q; Wed, 18 Oct 2017 12:09:12 +0000 Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n9q-00088k-LW; Wed, 18 Oct 2017 12:09:11 +0000 Received: from [85.158.143.35] by server-4.bemta-6.messagelabs.com id D6/EA-31244-66447E95; Wed, 18 Oct 2017 12:09:10 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpml+JIrShJLcpLzFFi42LJaLquqpvi8jz S4PBFJotbN1uZLZZ8XMxiserqAVYHZo+ju38zBTBGsWbmJeVXJLBmPLzexlpw9ylPRfvWOewN jGuO8nQxcnEICVxhlFj9p5MVwlnEKNHft5Spi5GTg1nAVeLGvs1sELaixIV7DSwgNq+AoMTJm U/AbAkBTYk7b1axg9giAkUSO8+9BLPZBPQk5p6dBDXHUmL+xFNgc4QFMiT2/7kINcdMYtLEX8 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X-StarScan-Version: 9.4.45; banners=-,-,- X-VirusChecked: Checked Received: (qmail 31957 invoked from network); 18 Oct 2017 12:09:07 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-10.tower-21.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 18 Oct 2017 12:09:07 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n9D-00062z-V2; Wed, 18 Oct 2017 12:08:31 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e4n9D-0001Ii-Tq; Wed, 18 Oct 2017 12:08:31 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Wed, 18 Oct 2017 12:08:31 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 240 (CVE-2017-15595) - Unlimited recursion in linear pagetable de-typing X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15595 / XSA-240 version 4 Unlimited recursion in linear pagetable de-typing UPDATES IN VERSION 4 ==================== Mention that 2nd patch is optional. CVE assigned. ISSUE DESCRIPTION ================= x86 PV guests are permitted to set up certain forms of what is often called "linear page tables", where pagetables contain references to other pagetables at the same level or higher. Certain restrictions apply in order to fit into Xen's page type handling system. An important restriction was missed, however: Stacking multiple layers of page tables of the same level on top of one another is not very useful, and the tearing down of such an arrangement involves recursion. With sufficiently many layers such recursion will result in a stack overflow, commonly resulting in Xen to crash. IMPACT ====== A malicious or buggy PV guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Privilege escalation and information leaks cannot be excluded. VULNERABLE SYSTEMS ================== All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been checked. Only x86 systems are affected. ARM systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM guests cannot leverage the vulnerability. MITIGATION ========== Running only HVM guests will avoid this vulnerability. For PV guests, the vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Jann Horn of Google Project Zero. RESOLUTION ========== Applying the appropriate attached patch series resolves this issue. The first patch fixes this known issue. The second, optional, patch in each series disables the `linear pagetable` option by default. It can be re-enabled by adding "pv-linear-pt=true' on the Xen command-line. Note that neither Linux nor MiniOS use linear pagetables; NetBSD and Novell Netware, however, do use this feature when running in PV mode. xsa240-unstable/*.patch xen-unstable xsa240-4.9/*.patch Xen 4.9.x xsa240-4.8/*.patch Xen 4.8.x xsa240-4.7/*.patch Xen 4.7.x xsa240-4.6/*.patch Xen 4.6.x xsa240-4.5/*.patch Xen 4.5.x $ sha256sum xsa240* xsa240*/* 6ad3f6c7817496d11d846ac551d8b37fc73daf488eaa1cda614eb3b5a34f858d xsa240.meta e227126ea204d6049c8bfb694e3d2bcac10382733ca4ece1f0f7dc36c625ac1d xsa240-unstable/0001-x86-limit-linear-page-table-use-to-a-single-level.patch c6bb1f47754bf4f57bb9205509c525336ff55da8bcae8ae95415bdf1bba70209 xsa240-unstable/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch 2e8168449f8594c5faa50feb311eaa7e74b38c726853b1cfbaf2fbd4cbbdb476 xsa240-4.5/0001-x86-limit-linear-page-table-use-to-a-single-level.patch ea95ed56a5f85753a41ca1abbb4abd5ea791d7596c8a9d20ceaa53862ee5ce15 xsa240-4.5/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch f7556cc4a13cd4334d79e73861f15dd619dfd6041a3ad89865b358035d2fcff8 xsa240-4.6/0001-x86-limit-linear-page-table-use-to-a-single-level.patch 24ad9f92938c112a6fcf46177d44597c49dc213a3644ce4fd59d4df507b072d3 xsa240-4.6/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch 5a9b8e0a4e55482826e6cf820ea01fbf6674fecf19b101f4578396e3fa98a8fd xsa240-4.7/0001-x86-limit-linear-page-table-use-to-a-single-level.patch acf9744b853c1c6ac071bcf5776d8d9463781bbdf658c2fecc59ee338c094750 xsa240-4.7/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch c0c624f51fb1bd9e31a2c120343164d545ab6e709ed4bb9e5dd89b5c4c4e49f8 xsa240-4.8/0001-x86-limit-linear-page-table-use-to-a-single-level.patch 7e3c2c4a4d0ee0a29abaa7aceffbb774b1f92aa81dfa4c5d1c5c5156b6bb0a3a xsa240-4.8/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch 7769866805e47b7a2109ba1778f263ddfa126bcb0b116612f76dfaca9bf70995 xsa240-4.9/0001-x86-limit-linear-page-table-use-to-a-single-level.patch 1053cb348dc8536cb12b4aca556ddc4c015810f8f0fd21a80dff37433ec082ea xsa240-4.9/0002-x86-mm-Disable-PV-linear-pagetables-by-default.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n9i-00080F-2Q; Wed, 18 Oct 2017 12:09:02 +0000 Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n9g-0007yc-S4; Wed, 18 Oct 2017 12:09:01 +0000 Received: from [85.158.139.211] by server-2.bemta-5.messagelabs.com id 04/6A-23269-B5447E95; Wed, 18 Oct 2017 12:08:59 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCJsWRWlGSWpSXmKPExsWS0XRdVTfK5Xm kwd7Dyha3brYyWyz5uJjFYtXVA6wOzB5Hd/9mCmCMYs3MS8qvSGDNOD95J3PBz01MFb33p7I0 MN5fwdTFyMUhJHCFUWLejy4oZxGjxKZX+1m7GDk5mAVcJW7s28wGYStKXLjXwAJi8woISpyc+ QTMlhDQlLjzZhU7iC0iUCSx89xLMJtNQE9i7tlJTBC9lhLzJ55iA1kgLNDCKLF6yx9miEFmEo cWzAGzWQRUJW7N3sU2gZFnFpLds5DsnoVk9yxGDqC4psT6XfoQprTE8n8cENXyEtvfzmGGsK0 kpn38CFVtLnF4FhPMwCndD9khbGuJTe1tUIssJPa8XcuKqcZRYv36c1Aj7SQ29zeyYVOzq+00 E0zN1fsvsdjlKPF78glGmJo3XfsYMdXYS1z5uRwqbiNx8MhjLO6xlzj5ZSojxFs2En3TqpCVL 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server-2.tower-206.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 18 Oct 2017 12:08:58 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n9M-000645-UB; Wed, 18 Oct 2017 12:08:40 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e4n9M-0001QD-Rn; Wed, 18 Oct 2017 12:08:40 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Wed, 18 Oct 2017 12:08:40 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 243 (CVE-2017-15592) - x86: Incorrect handling of self-linear shadow mappings with translated guests X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15592 / XSA-243 version 4 x86: Incorrect handling of self-linear shadow mappings with translated guests UPDATES IN VERSION 4 ==================== CVE assigned. ISSUE DESCRIPTION ================= The shadow pagetable code uses linear mappings to inspect and modify the shadow pagetables. A linear mapping which points back to itself is known as self-linear. For translated guests, the shadow linear mappings (being in a separate address space) are not intended to be self-linear. For non-translated guests, the shadow linear mappings (being the same address space) are intended to be self-linear. When constructing a monitor pagetable for Xen to run on a vcpu with, the shadow linear slot is filled with a self-linear mapping, and for translated guests, shortly thereafter replaced with a non-self-linear mapping, when the guest's %cr3 is shadowed. However when writeable heuristics are used, the shadow mappings are used as part of shadowing %cr3, causing the heuristics to be applied to Xen's pagetables, not the guest shadow pagetables. While investigating, it was also identified that PV auto-translate mode was insecure. This mode was removed in Xen 4.7 due to being unused, unmaintained and presumed broken. We are not aware of any guest implementation of PV auto-translate mode. IMPACT ====== A malicious or buggy HVM guest may cause a hypervisor crash, resulting in a Denial of Service (DoS) affecting the entire host, or cause hypervisor memory corruption. We cannot rule out a guest being able to escalate its privilege. VULNERABLE SYSTEMS ================== All versions of Xen are vulnerable. HVM guests using shadow mode paging can exploit this vulnerability. HVM guests using Hardware Assisted Paging (HAP) as well as PV guests cannot exploit this vulnerability. ARM systems are not vulnerable. MITIGATION ========== Running only PV guests will avoid this vulnerability. Where the HVM guest is explicitly configured to use shadow paging (eg via the `hap=0' xl domain configuration file parameter), changing to HAP (eg by setting `hap=1') will avoid exposing the vulnerability to those guests. HAP is the default (in upstream Xen), where the hardware supports it; so this mitigation is only applicable if HAP has been disabled by configuration. CREDITS ======= This issue was discovered by Andrew Cooper of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa243.patch xen-unstable, Xen 4.9.x xsa243-4.8.patch Xen 4.8.x xsa243-4.7.patch Xen 4.7.x xsa243-4.6-[1,2].patch Xen 4.6.x xsa243-4.{6-1,5-2}.patch Xen 4.5.x $ sha256sum xsa243* 61b05e2d6655f5d18cd53b16e03499152c603162584f64d68fad31b088cc5cd2 xsa243.meta a5b484db80346f7e75c7921ee4780567f04b9f9b4620c0cde4bfa1df3ac0f87f xsa243.patch 79e1c5e088eee8e78aa67895a29d611352c64251854e4c5129e33c85988a47a5 xsa243-4.5-2.patch 722073aad1e734e24b0b79d03a1957e491f3616fe6e244a89050f7a50f8f356b xsa243-4.6-1.patch 94cb346c486f88f2f4f701564017e1997e518a5a14218f0e38ff882c60fb382c xsa243-4.6-2.patch 465ba9e3293591a3c84c122ffd73474fe96483f5e21565440d5fbc207fa4c4a9 xsa243-4.7.patch f8e471b42502905a442d43934ac339663a6124118c9762b31f2ad930fd532e64 xsa243-4.8.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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From: Xen.org security team Message-Id: Date: Wed, 18 Oct 2017 12:08:43 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 244 (CVE-2017-15594) - x86: Incorrect handling of IST settings during CPU hotplug X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15594 / XSA-244 version 3 x86: Incorrect handling of IST settings during CPU hotplug UPDATES IN VERSION 3 ==================== CVE assigned. ISSUE DESCRIPTION ================= The x86-64 architecture allows interrupts to be run on distinct stacks. The choice of stack is encoded in a field of the corresponding interrupt descriptor in the Interrupt Descriptor Table (IDT). That field selects an entry from the active Task State Segment (TSS). Since, on AMD hardware, Xen switches to an HVM guest's TSS before actually entering the guest, with the Global Interrupt Flag still set, the selectors in the IDT entry are switched when guest context is loaded/unloaded. When a new CPU is brought online, its IDT is copied from CPU0's IDT, including those selector fields. If CPU0 happens at that moment to be in HVM context, wrong values for those IDT fields would be installed for the new CPU. If the first guest vCPU to be run on that CPU belongs to a PV guest, it will then have the ability to escalate its privilege or crash the hypervisor. IMPACT ====== A malicious or buggy x86 PV guest could escalate its privileges or crash the hypervisor. VULNERABLE SYSTEMS ================== All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been checked. Only PV guests can exploit the vulnerability. HVM guests cannot exploit the vulnerability, but their presence is necessary for the exposure of the vulnerability to PV guests. Only x86 systems using SVM (AMD virtualisation extensions) rather than VMX (Intel virtualisation extensions) are vulnerable. Therefore AMD x86 hardware is vulnerable; Intel hardware is not vulnerable. ARM systems are not vulnerable. MITIGATION ========== Avoiding to online CPUs at runtime will avoid this vulnerability. Running only HVM or only PV guests on any individual host will also avoid this vulnerability. CREDITS ======= This issue was discovered by Andrew Cooper of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa244.patch xen-unstable, Xen 4.9.x, Xen 4.8.x xsa244-4.7.patch Xen 4.7.x xsa244-4.6.patch Xen 4.6.x xsa244-4.5.patch Xen 4.5.x $ sha256sum xsa244* 5b663620a1b0d5f07e7ae4d1d3506d925515d5f85830ca49dda75cab1218506f xsa244.meta bcf22b332bf3f6fe8c86e4de67f82628c9b8e257d9513c3bf5c7f5dd71d86c33 xsa244.patch 4c4543fdfd25b4a8ea7d53f3f45011ec137798e7d4e690d8f3ea58d77afb5f06 xsa244-4.5.patch eaa3ba303980d783813db7aee948a9cb2723328da5fa5650ffca7b825c21bab6 xsa244-4.6.patch 4d8cf754f760ef05488e9fb25a7ebd9a7e46f3742e91eee1a8385fd1e611ea8c xsa244-4.7.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 60571 invoked from network); 18 Oct 2017 12:08:30 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-7.tower-21.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 18 Oct 2017 12:08:30 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n92-000620-Bi; Wed, 18 Oct 2017 12:08:20 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e4n92-0001A0-8j; Wed, 18 Oct 2017 12:08:20 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Wed, 18 Oct 2017 12:08:20 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 235 (CVE-2017-15596) - add-to-physmap error paths fail to release lock on ARM X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15596 / XSA-235 version 2 add-to-physmap error paths fail to release lock on ARM UPDATES IN VERSION 2 ==================== CVE assigned. ISSUE DESCRIPTION ================= When dealing with the grant map space of add-to-physmap operations, ARM specific code recognizes a number of error conditions, but fails to release a lock being held on the respective exit paths. IMPACT ====== A malicious guest administrator can cause a denial of service. Specifically, prevent use of a physical CPU for an indefinite period of time. VULNERABLE SYSTEMS ================== Xen versions 4.4 and later are vulnerable. Xen versions 4.3 and earlier are not vulnerable. Only ARM systems are affected. X86 systems are not affected. MITIGATION ========== On systems where the guest kernel is controlled by the host rather than guest administrator, running only kernels which only issue sane hypercalls will prevent untrusted guest users from exploiting this issue. However untrusted guest administrators can still trigger it unless further steps are taken to prevent them from loading code into the kernel (e.g by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Wei Liu of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa235.patch xen-unstable xsa235-4.9.patch Xen 4.9.x, Xen 4.8.x xsa235-4.7.patch Xen 4.7.x xsa235-4.6.patch Xen 4.6.x xsa235-4.5.patch Xen 4.5.x $ sha256sum xsa235* 6ec8bf9462de65fee3896246f52c00941b2d83c759b3f7b28a440eb977fcbc37 xsa235.meta c81f534e96fe38b9f77794bb143d104d66ce2d7177bda43f872642616e23df65 xsa235.patch 3c21cb1a53f5979b069568c6cd6df3aad00c19e0e459e37625d6a3c0f4f360cc xsa235-4.5.patch 47cda4f32b65f3543af368c324a2e5b308b698a1c7d8bc84fc274eb2cdb45c0e xsa235-4.6.patch f30848eee71e66687b421b87be1d8e3f454c0eb395422546c62a689153d1e31c xsa235-4.7.patch d8f012734fbf6019c1ff864744e308c41dfb9c7804ca3be2771c2c972cdf4bd5 xsa235-4.9.patch $ NOTE REGARDING LACK OF EMBARGO ============================== The issue was discussed publicly before being recognized as a security issue. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBCAAGBQJZ50QUAAoJEIP+FMlX6CvZR0QH/RdlZ9q8CcqWVVF+De8dlKwk HtgYWWGK/gYgfiwhnYT1fJlW3XZOvbf/fZDUTnuFYL6izJtpcEPuEb3tWM5Nzcs/ u85wyYQmzmDPRCJVuONamWFc0vnSBvb1NqKVqwQEBo3WVbPS5YwIaFgA/z8lZaT9 NV90FLOBjjRyh9ktxqtGQQvt1JcxVxNWLbV974PwFuURMC5kTt2eNvU2vOmgWV5V gmlBcJyMEzAaZKCmotkt1Tla82ydXG1F+obaLhSVRWp0JFugvVJX9I3cqZk4rovv HKqLm1bmzloWPo2wvjSnRJIVu9us3MD4VqjxWOwQQq1nrTdDdlMcC6sfn93PaVo= =R0BH -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 62037 invoked from network); 18 Oct 2017 12:08:43 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-7.tower-27.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 18 Oct 2017 12:08:43 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n9I-00063V-0r; Wed, 18 Oct 2017 12:08:36 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e4n9I-0001M6-06; Wed, 18 Oct 2017 12:08:36 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Wed, 18 Oct 2017 12:08:35 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 242 (CVE-2017-15593) - page type reference leak on x86 X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15593 / XSA-242 version 3 page type reference leak on x86 UPDATES IN VERSION 3 ==================== CVE assigned. ISSUE DESCRIPTION ================= The page type system of Xen requires cleanup when the last reference for a given page is being dropped. In order to exclude simultaneous updates to a given page by multiple parties, pages which are updated are locked beforehand. This locking includes temporarily increasing the type reference count by one. When the page is later unlocked, the context precludes cleanup, so the reference that is then dropped must not be the last one. This was not properly enforced. IMPACT ====== A malicious or buggy PV guest may cause a memory leak upon shutdown of the guest, ultimately perhaps resulting in Denial of Service (DoS) affecting the entire host. VULNERABLE SYSTEMS ================== All Xen versions from 3.4 onwards are vulnerable. Xen versions 3.3 and earlier are not vulnerable. Only x86 systems are affected. ARM systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM guests cannot leverage the vulnerability. MITIGATION ========== Running only HVM guests will avoid this vulnerability. For PV guests, the vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. CREDITS ======= This issue was discovered by Jan Beulich of SUSE. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa242.patch xen-unstable xsa242-4.9.patch Xen 4.9.x, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x, Xen 4.5.x $ sha256sum xsa242* 168db3aef00806025afa255dee35cd0c042706a27a0256744e4d63f3ee86a2e8 xsa242.meta 16848f71311c2fd6a38afd7602e59211c89a3daf29b874097dba0b1e31ba6eec xsa242.patch 5e66b6b1d1cd400905d3abd3478144539c3afa24f5a744a11809d9c5eb517b98 xsa242-4.9.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 4967 invoked from network); 18 Oct 2017 12:09:46 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-13.tower-21.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 18 Oct 2017 12:09:46 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4n99-00062Y-RS; Wed, 18 Oct 2017 12:08:27 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e4n99-0001G3-P0; Wed, 18 Oct 2017 12:08:27 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Wed, 18 Oct 2017 12:08:27 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 239 (CVE-2017-15589) - hypervisor stack leak in x86 I/O intercept code X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15589 / XSA-239 version 3 hypervisor stack leak in x86 I/O intercept code UPDATES IN VERSION 3 ==================== CVE assigned. ISSUE DESCRIPTION ================= Intercepted I/O operations may deal with less than a full machine word's worth of data. While read paths had been the subject of earlier XSAs (and hence have been fixed), at least one write path was found where the data stored into an internal structure could contain bits from an uninitialized hypervisor stack slot. A subsequent emulated read would then be able to retrieve these bits. IMPACT ====== A malicious unprivileged x86 HVM guest may be able to obtain sensitive information from the host or other guests. VULNERABLE SYSTEMS ================== All Xen versions are vulnerable. Only x86 systems are affected. ARM systems are not affected. Only HVM guests can leverage this vulnerability. PV guests cannot leverage this vulnerability. MITIGATION ========== Running only PV guests will avoid this issue. CREDITS ======= This issue was discovered by Roger Pau Monné of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa239.patch xen-unstable, Xen 4.9.x, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x xsa239-4.5.patch Xen 4.5.x $ sha256sum xsa239* eb7971be89199eb3ff510f4f5650fd5a8ec588b9fcb8f89230216fac4214ef21 xsa239.meta 087a8b3cf7ecbdbde593033c127cbcf6c37f532bf33d90f72c19e493970a799c xsa239.patch b91a68fe67240f2a5bb9460c5b650e9595364afa180f8702aef783815e3d7dcd xsa239-4.5.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 25959 invoked from network); 24 Oct 2017 13:56:04 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-12.tower-31.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 24 Oct 2017 13:56:04 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e6zgQ-0007OW-RS; Tue, 24 Oct 2017 13:55:54 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1e6zgQ-0007u1-QN; Tue, 24 Oct 2017 13:55:54 +0000 Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team Message-Id: Date: Tue, 24 Oct 2017 13:55:54 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 236 (CVE-2017-15597) - pin count / page reference race in grant table code X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2017-15597 / XSA-236 version 3 pin count / page reference race in grant table code UPDATES IN VERSION 3 ==================== We now once again think that only Xen 4.2 and newer are vulnerable. Fix grammar typo. Public release. ISSUE DESCRIPTION ================= Grant copying code made an implication that any grant pin would be accompanied by a suitable page reference. Other portions of code, however, did not match up with that assumption. When such a grant copy operation is being done on a grant of a dying domain, the assumption turns out wrong. IMPACT ====== A malicious guest administrator can cause hypervisor memory corruption, most likely resulting in host crash and a Denial of Service. Privilege escalation and information leaks cannot be ruled out. VULNERABLE SYSTEMS ================== Xen versions from 4.2 onwards are vulnerable. Xen versions 4.1 and earlier are not vulnerable. Both x86 and ARM are vulnerable, and on x86 both PV and HVM guests can trigger the vulnerability. MITIGATION ========== Running only guests without para-virtual drivers, and known not to issue grant table operations can avoid the vulnerability. CREDITS ======= This issue was discovered by Pawel Wieczorkiewicz of Amazon. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa236.patch xen-unstable xsa236-4.9.patch Xen 4.9.x, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x xsa236-4.5.patch Xen 4.5.x $ sha256sum xsa236* 2f7736c43b6da7d983cf3edbc10024c4cba9d6d3e5b2b758a07de726a804617d xsa236.meta f06f01fb4ffcfc7938a2fc6ab73559ebbaac2d448bd36ca538bb07ba510eeb4a xsa236.patch c98a4b50d021414626cd68002643e9aa0cc6067b98cd5dd995c0140a7933d1ea xsa236-4.5.patch b6fe5604af26e93184f30127ebbb644f127ecc7116b093c161ca3044b44d2fe9 xsa236-4.9.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) For more information about permissible uses of embargoed information, consult the Xen Project community's agreed Security Policy: http://www.xenproject.org/security-policy.html -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBCAAGBQJZ70ZiAAoJEIP+FMlX6CvZlBgH/0cwYrP3/zvc3dNJRtpxyn1J BkigYP8JBIYW85M7KdZDFBhgXIpuw6x45XZ4qfq6rrz3GOp5oZgZVFIoggHZBzRe eVCIpjOAXInM7ThsE6pV1Qr/JKe8V6RJumXEgqr5zznWpGmcFChWmobA+BBq64P6 87ALWjXBcuqOyjJnJQwEjk+kHJMnIpocVZk6NqcDeoHoJvRh/Zk4YYc78qm4Lucw d0yHq5azA9bgt5iJgxUvF74B4r8JxTLmA8sn7Kx280UJGEAkqM7jj1QVQ6sb8fgO q6RSzBVnuVqLh4E1Dji9KaxcRRVnbrp2FFpBUUWHAVVO4O0GYlu5NxERnnye9v0= =zI77 -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; name="xsa236.meta" Content-Disposition: attachment; filename="xsa236.meta" Content-Transfer-Encoding: base64 ewogICJYU0EiOiAyMzYsCiAgIlN1cHBvcnRlZFZlcnNpb25zIjogWwogICAg Im1hc3RlciIsCiAgICAiNC45IiwKICAgICI0LjgiLAogICAgIjQuNyIsCiAg ICAiNC42IiwKICAgICI0LjUiCiAgXSwKICAiVHJlZXMiOiBbCiAgICAieGVu IgogIF0sCiAgIlJlY2lwZXMiOiB7CiAgICAiNC41IjogewogICAgICAiWGVu VmVyc2lvbiI6ICI0LjUiLAogICAgICAiUmVjaXBlcyI6IHsKICAgICAgICAi eGVuIjogewogICAgICAgICAgIlN0YWJsZVJlZiI6ICI4MzcyNGQ5ZjNhZTIx YTNiOTYzNjI3NDJlMmYwNTJiMTlkOWY1NTlhIiwKICAgICAgICAgICJQcmVy ZXFzIjogWwogICAgICAgICAgICAyMzcsCiAgICAgICAgICAgIDIzOCwKICAg ICAgICAgICAgMjM5LAogICAgICAgICAgICAyNDAsCiAgICAgICAgICAgIDI0 MSwKICAgICAgICAgICAgMjQyLAogICAgICAgICAgICAyNDMsCiAgICAgICAg ICAgIDI0NCwKICAgICAgICAgICAgMjQ1CiAgICAgICAgICBdLAogICAgICAg ICAgIlBhdGNoZXMiOiBbCiAgICAgICAgICAgICJ4c2EyMzYtNC41LnBhdGNo IgogICAgICAgICAgXQogICAgICAgIH0KICAgICAgfQogICAgfSwKICAgICI0 LjYiOiB7CiAgICAgICJYZW5WZXJzaW9uIjogIjQuNiIsCiAgICAgICJSZWNp cGVzIjogewogICAgICAgICJ4ZW4iOiB7CiAgICAgICAgICAiU3RhYmxlUmVm IjogIjE2NThhODc2OTBhYzgzOWU4NWRiMTJiYmY0MDliZTYyYmI5Mzg2NDAi LAogICAgICAgICAgIlByZXJlcXMiOiBbCiAgICAgICAgICAgIDIzNywKICAg ICAgICAgICAgMjM4LAogICAgICAgICAgICAyMzksCiAgICAgICAgICAgIDI0 MCwKICAgICAgICAgICAgMjQxLAogICAgICAgICAgICAyNDIsCiAgICAgICAg ICAgIDI0MywKICAgICAgICAgICAgMjQ0LAogICAgICAgICAgICAyNDUKICAg ICAgICAgIF0sCiAgICAgICAgICAiUGF0Y2hlcyI6IFsKICAgICAgICAgICAg InhzYTIzNi00LjkucGF0Y2giCiAgICAgICAgICBdCiAgICAgICAgfQogICAg ICB9CiAgICB9LAogICAgIjQuNyI6IHsKICAgICAgIlhlblZlcnNpb24iOiAi NC43IiwKICAgICAgIlJlY2lwZXMiOiB7CiAgICAgICAgInhlbiI6IHsKICAg ICAgICAgICJTdGFibGVSZWYiOiAiYzc3ODNkOWMyNmZjMTkxODYyZDk4ODNk YTIyMzg3MzQwYjFmYWIxOCIsCiAgICAgICAgICAiUHJlcmVxcyI6IFsKICAg ICAgICAgICAgMjM3LAogICAgICAgICAgICAyMzgsCiAgICAgICAgICAgIDIz OSwKICAgICAgICAgICAgMjQwLAogICAgICAgICAgICAyNDEsCiAgICAgICAg ICAgIDI0MiwKICAgICAgICAgICAgMjQzLAogICAgICAgICAgICAyNDQsCiAg ICAgICAgICAgIDI0NQogICAgICAgICAgXSwKICAgICAgICAgICJQYXRjaGVz IjogWwogICAgICAgICAgICAieHNhMjM2LTQuOS5wYXRjaCIKICAgICAgICAg IF0KICAgICAgICB9CiAgICAgIH0KICAgIH0sCiAgICAiNC44IjogewogICAg ICAiWGVuVmVyc2lvbiI6ICI0LjgiLAogICAgICAiUmVjaXBlcyI6IHsKICAg ICAgICAieGVuIjogewogICAgICAgICAgIlN0YWJsZVJlZiI6ICIzNjg5OGVi MTI1NzJmMGExZjg1Y2I1NGQ0YTllOTBhZmNiNmY3MDQ1IiwKICAgICAgICAg ICJQcmVyZXFzIjogWwogICAgICAgICAgICAyMzcsCiAgICAgICAgICAgIDIz OCwKICAgICAgICAgICAgMjM5LAogICAgICAgICAgICAyNDAsCiAgICAgICAg ICAgIDI0MSwKICAgICAgICAgICAgMjQyLAogICAgICAgICAgICAyNDMsCiAg ICAgICAgICAgIDI0NCwKICAgICAgICAgICAgMjQ1CiAgICAgICAgICBdLAog ICAgICAgICAgIlBhdGNoZXMiOiBbCiAgICAgICAgICAgICJ4c2EyMzYtNC45 LnBhdGNoIgogICAgICAgICAgXQogICAgICAgIH0KICAgICAgfQogICAgfSwK ICAgICI0LjkiOiB7CiAgICAgICJYZW5WZXJzaW9uIjogIjQuOSIsCiAgICAg ICJSZWNpcGVzIjogewogICAgICAgICJ4ZW4iOiB7CiAgICAgICAgICAiU3Rh YmxlUmVmIjogIjJjYzNkMzJmNDBjNzFjYjI0MjQ3N2EzZjg5MzgwNzRkNGZj MzY4MjkiLAogICAgICAgICAgIlByZXJlcXMiOiBbCiAgICAgICAgICAgIDIz NywKICAgICAgICAgICAgMjM4LAogICAgICAgICAgICAyMzksCiAgICAgICAg ICAgIDI0MCwKICAgICAgICAgICAgMjQxLAogICAgICAgICAgICAyNDIsCiAg ICAgICAgICAgIDI0MywKICAgICAgICAgICAgMjQ0LAogICAgICAgICAgICAy NDUKICAgICAgICAgIF0sCiAgICAgICAgICAiUGF0Y2hlcyI6IFsKICAgICAg ICAgICAgInhzYTIzNi00LjkucGF0Y2giCiAgICAgICAgICBdCiAgICAgICAg fQogICAgICB9CiAgICB9LAogICAgIm1hc3RlciI6IHsKICAgICAgIlhlblZl cnNpb24iOiAibWFzdGVyIiwKICAgICAgIlJlY2lwZXMiOiB7CiAgICAgICAg InhlbiI6IHsKICAgICAgICAgICJTdGFibGVSZWYiOiAiYThlYTZlMjY4ODEx OGEzZTE5ZTI5YjM5ZTMxNmZhYTVmOTZhYjlkMSIsCiAgICAgICAgICAiUHJl cmVxcyI6IFsKICAgICAgICAgICAgMjM3LAogICAgICAgICAgICAyMzgsCiAg ICAgICAgICAgIDIzOSwKICAgICAgICAgICAgMjQwLAogICAgICAgICAgICAy NDEsCiAgICAgICAgICAgIDI0MiwKICAgICAgICAgICAgMjQzLAogICAgICAg ICAgICAyNDQsCiAgICAgICAgICAgIDI0NQogICAgICAgICAgXSwKICAgICAg ICAgICJQYXRjaGVzIjogWwogICAgICAgICAgICAieHNhMjM2LnBhdGNoIgog ICAgICAgICAgXQogICAgICAgIH0KICAgICAgfQogICAgfQogIH0KfQ== --=separator Content-Type: application/octet-stream; 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([2a02:c7f:ac18:da00:1524:3548:6fd4:aa91]) by smtp.gmail.com with ESMTPSA id k130sm4130878wmg.12.2017.10.30.05.57.02 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Oct 2017 05:57:02 -0700 (PDT) From: Lars Kurth Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Date: Mon, 30 Oct 2017 12:57:01 +0000 Message-Id: To: xen-announce@lists.xenproject.org X-Mailer: Apple Mail (2.3273) X-Mailman-Approved-At: Mon, 30 Oct 2017 12:57:16 +0000 Subject: [Xen-announce] Announcing the Xen Project 4.10 RC and Test Day Schedules X-BeenThere: xen-announce@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" RGVhciBjb21tdW5pdHkgbWVtYmVycywKCnR3byB3ZWVrcyBhZ28sIHdlIGNyZWF0ZWQgWGVuIDQu MTAgUkMxIGFuZCB3aWxsIHJlbGVhc2UgYSBuZXcgcmVsZWFzZSBjYW5kaWRhdGUgZXZlcnkgTU9O REFZLCB1bnRpbCB3ZSBkZWNsYXJlIGEgcmVsZWFzZSBjYW5kaWRhdGUgYXMgdGhlIGZpbmFsIGNh bmRpZGF0ZSBhbmQgY3V0IHRoZSBYZW4gNC4xMCByZWxlYXNlLiAKCldlIHdpbGwgYWxzbyBob2xk IGEgVGVzdCBEYXkgZXZlcnkgV0VETkVTREFZIGZvciB0aGUgcmVsZWFzZSBjYW5kaWRhdGUgdGhh dCB3YXMgcmVsZWFzZWQgdGhlIHdlZWsgcHJpb3IgdG8gdGhlIFRlc3QgRGF5IHN0YXJ0aW5nIGZy b20gUkMyICh3aGljaCB3YXMgcmVsZWFzZWQgbGFzdCBNb25kYXkpLiBOb3RlIHRoYXQgUkPigJlz IGFyZSBhbm5vdW5jZWQgb24gdGhlIGZvbGxvd2luZyBtYWlsaW5nIGxpc3RzOiB4ZW4tYW5ub3Vu Y2UsIHhlbi1kZXZlbCBhbmQgeGVuLXVzZXJzLiBUaGlzIG1lYW5zIHdlIHdpbGwgaGF2ZSBUZXN0 IERheXMgY29taW5nIHVwIG9uIE5vdiAxc3QsIDh0aCwgMTV0aCBhbmQgMjJuZC4gWW91ciB0ZXN0 aW5nIGlzIHN0aWxsIHZhbHVhYmxlIG9uIG90aGVyIGRheXMsIHNvIHBsZWFzZSBmZWVsIGZyZWUg dG8gc2VuZCBUZXN0IFJlcG9ydHMgYXMgb3V0bGluZWQgYmVsb3cgYXQgYW55IHRpbWUuCgo9PSBH ZXR0aW5nLCBCdWlsZGluZyBhbmQgSW5zdGFsbGluZyBhIFJlbGVhc2UgQ2FuZGlkYXRlID09CgpS ZWxlYXNlIGNhbmRpZGF0ZXMgYXJlIGF2YWlsYWJsZSBmcm9tIG91ciBnaXQgcmVwb3NpdG9yeSBh dAoKZ2l0Oi8veGVuYml0cy54ZW5wcm9qZWN0Lm9yZy94ZW4uZ2l0ICh0YWcgNC4xMC4wLTxyYz4p Cgp3aGVyZSA8cmM+IGlzIHJjMSwgcmMyLCByYzMsIGV0Yy4gYW5kIGFzIHRhcmJhbGwgZnJvbQoK aHR0cHM6Ly9kb3dubG9hZHMueGVucHJvamVjdC5vcmcvcmVsZWFzZS94ZW4vNC4xMC4wLTxyYz4v eGVuLTQuMTAuMC08cmM+LnRhci5neiAKaHR0cHM6Ly9kb3dubG9hZHMueGVucHJvamVjdC5vcmcv cmVsZWFzZS94ZW4vNC4xMC4wLTxyYz4veGVuLTQuMTAuMC08cmM+LnRhci5nei5zaWcgCgpEZXRh aWxlZCBidWlsZCBhbmQgSW5zdGFsbCBpbnN0cnVjdGlvbnMgY2FuIGJlIGZvdW5kIG9uIHRoZSBU ZXN0IERheSBXaWtpLiBNYWtlIHN1cmUgeW91IGNoZWNrIHRoZSBrbm93biBpc3N1ZXMgc2VjdGlv biBvZiB0aGUgaW5zdHJ1Y3Rpb25zIGJlZm9yZSB0cnlpbmcgdG8gZG93bmxvYWQgYW4gUkMuCgo9 PSBUZXN0aW5nIG5ldyBGZWF0dXJlcywgVGVzdCBhbmQgQnVnIFJlcG9ydHMgPT0KCllvdSBjYW4g ZmluZCBUZXN0IEluc3RydWN0aW9ucyBmb3IgbmV3IGZlYXR1cmVzIG9uIG91ciBUZXN0IERheSBX aWtpIGFuZCBpbnN0cnVjdGlvbnMgZm9yIGdlbmVyYWwgdGVzdHMgb24gVGVzdGluZyBYZW4uIFRo ZSBmb2xsb3dpbmcgcGFnZXMgcHJvdmlkZSBpbmZvcm1hdGlvbiBvbiBob3cgdG8gcmVwb3J0IHN1 Y2Nlc3NmdWwgdGVzdHMgYW5kIGhvdyB0byByZXBvcnQgYnVncyBhbmQgaXNzdWVzLgoKSGFwcHkg VGVzdGluZyEKCj09IFJlc291cmNlcyA9PQoqIFRlc3QgRGF5IFdpa2k6IGh0dHBzOi8vd2lraS54 ZW5wcm9qZWN0Lm9yZy93aWtpL1hlbl80LjEwX1JDX3Rlc3RfaW5zdHJ1Y3Rpb25zCiogS25vd24g SXNzdWVzOiBodHRwczovL3dpa2kueGVucHJvamVjdC5vcmcvd2lraS9YZW5fNC4xMF9SQ190ZXN0 X2luc3RydWN0aW9ucyNLbm93bl9pc3N1ZXMKCkJlc3QgUmVnYXJkcwpMYXJzCl9fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1hbm5vdW5jZSBtYWlsaW5n IGxpc3QKWGVuLWFubm91bmNlQGxpc3RzLnhlbi5vcmcKaHR0cHM6Ly9saXN0cy54ZW4ub3JnL3hl bi1hbm5vdW5jZQ==