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([2001:41d0:1:6c23::1]) by smtp.gmail.com with ESMTPSA id o135sm8587650wmg.1.2017.11.13.03.43.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 Nov 2017 03:43:31 -0800 (PST) To: xen-announce@lists.xenproject.org, xen-users@lists.xenproject.org, xen-devel From: Julien Grall Message-ID: <28bbfdba-3d79-1836-40f0-dfd2da8b9041@linaro.org> Date: Mon, 13 Nov 2017 11:43:29 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 Content-Language: en-US X-Mailman-Approved-At: Mon, 13 Nov 2017 11:45:35 +0000 Cc: Lars Kurth Subject: [Xen-announce] Xen 4.10 RC4 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-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: xen-announce-bounces@lists.xen.org Sender: "Xen-announce" SGkgYWxsLAoKWGVuIDQuMTAgUkM0IGlzIHRhZ2dlZC4gWW91IGNhbiBjaGVjayB0aGF0IG91dCBm cm9tIHhlbi5naXQ6CgogICBnaXQ6Ly94ZW5iaXRzLnhlbi5vcmcveGVuLmdpdCA0LjEwLjAtcmM0 CgpGb3IgeW91ciBjb252ZW5pZW5jZSB0aGVyZSBpcyBhbHNvIGEgdGFyYmFsbCBhdDoKaHR0cHM6 Ly9kb3dubG9hZHMueGVucHJvamVjdC5vcmcvcmVsZWFzZS94ZW4vNC4xMC4wLXJjNC94ZW4tNC4x MC4wLXJjNC50YXIuZ3oKCkFuZCB0aGUgc2lnbmF0dXJlIGlzIGF0OgpodHRwczovL2Rvd25sb2Fk cy54ZW5wcm9qZWN0Lm9yZy9yZWxlYXNlL3hlbi80LjEwLjAtcmM0L3hlbi00LjEwLjAtcmM0LnRh ci5nei5zaWcKClBsZWFzZSBzZW5kIGJ1ZyByZXBvcnRzIGFuZCB0ZXN0IHJlcG9ydHMgdG8KeGVu LWRldmVsQGxpc3RzLnhlbnByb2plY3Qub3JnLiBXaGVuIHNlbmRpbmcgYnVnIHJlcG9ydHMsIHBs ZWFzZSBDQwpyZWxldmFudCBtYWludGFpbmVycyBhbmQgbWUgKGp1bGllbi5ncmFsbEBsaW5hcm8u b3JnKS4KClRoYW5rcywKCi0tIApKdWxpZW4gR3JhbGwKCl9fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fClhlbi1hbm5vdW5jZSBtYWlsaW5nIGxpc3QKWGVuLWFu bm91bmNlQGxpc3RzLnhlbi5vcmcKaHR0cHM6Ly9saXN0cy54ZW4ub3JnL3hlbi1hbm5vdW5jZQ== From xen-announce-bounces@lists.xen.org Wed Nov 15 17:14:35 2017 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Wed, 15 Nov 2017 17:14:35 +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 1eF1Fw-0003bt-PG; 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 1917 invoked from network); 15 Nov 2017 17:13:40 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-6.tower-21.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 15 Nov 2017 17:13:40 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eF1Fd-00078w-Ac; Wed, 15 Nov 2017 17:13:25 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1eF1Fd-0002My-86; Wed, 15 Nov 2017 17:13:25 +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, 15 Nov 2017 17:13:25 +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 5 x86: Incorrect handling of self-linear shadow mappings with translated guests UPDATES IN VERSION 5 ==================== New final patch, addressing a hypervisor crash the original fix caused, which by itself represents another security issue (DoS). 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 set of patches resolves this issue. xsa243-[12].patch xen-unstable, Xen 4.9.x xsa243-{4.8-1,2}.patch Xen 4.8.x xsa243-{4.7-1,2}.patch Xen 4.7.x xsa243-{4.6-[12],2}.patch Xen 4.6.x xsa243-4.{6-1,5-[23]}.patch Xen 4.5.x $ sha256sum xsa243* a5b484db80346f7e75c7921ee4780567f04b9f9b4620c0cde4bfa1df3ac0f87f xsa243-1.patch 013cff90312305b7f4ce6818a25760bcfca61bfadd860b694afa04d56e60c563 xsa243-2.patch 79e1c5e088eee8e78aa67895a29d611352c64251854e4c5129e33c85988a47a5 xsa243-4.5-2.patch b838f387747c6e45314f44202c018ad907a8119bb7d8330fc875dc4243626e78 xsa243-4.5-3.patch 722073aad1e734e24b0b79d03a1957e491f3616fe6e244a89050f7a50f8f356b xsa243-4.6-1.patch 94cb346c486f88f2f4f701564017e1997e518a5a14218f0e38ff882c60fb382c xsa243-4.6-2.patch 465ba9e3293591a3c84c122ffd73474fe96483f5e21565440d5fbc207fa4c4a9 xsa243-4.7-1.patch f8e471b42502905a442d43934ac339663a6124118c9762b31f2ad930fd532e64 xsa243-4.8-1.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 iQEcBAEBCAAGBQJaDHWmAAoJEIP+FMlX6CvZbKgH/RsntzKBpEJQfElzpN15+eMM Kakfq3Mzad4JuaOb5dVy4fhE88gHgE344mmiUqu/h+pwRKofC/a3DvS4GPO8NJAI Zdu1CCkuZ3/L3IpbtdGsLMw1EZGQLXNsQGWCgDB3sNAT6Ue+FvmJbiP0RkIO+qXw 7KSCfs2NtMvkj17jt5ZYj2Y43d0IvWirR3LHkJIDR0ZPYkX5WagAmuOom3bj57lt 0Q/GC40x+kO9lQSw299CZxuHTi34zu0V4/HRtfSSVph5Gbcb+4kxMqv8e3wRfgg9 kBF6FD12oLJkArIeb/J72m13RTiIJDiG3VltS9B2Vmm9+LZOhBvbsfILrePk0qE= =6RHQ -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; name="xsa243-1.patch" Content-Disposition: attachment; filename="xsa243-1.patch" Content-Transfer-Encoding: base64 RnJvbTogQW5kcmV3IENvb3BlciA8YW5kcmV3LmNvb3BlcjNAY2l0cml4LmNv bT4KU3ViamVjdDogeDg2L3NoYWRvdzogRG9uJ3QgY3JlYXRlIHNlbGYtbGlu ZWFyIHNoYWRvdyBtYXBwaW5ncyBmb3IgNC1sZXZlbCB0cmFuc2xhdGVkIGd1 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(104.130.215.37) by server-6.tower-27.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 15 Nov 2017 17:13:41 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eF1Fa-00078m-PT; Wed, 15 Nov 2017 17:13:22 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1eF1Fa-0002LF-Kg; Wed, 15 Nov 2017 17:13:22 +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, 15 Nov 2017 17:13:22 +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 5 Unlimited recursion in linear pagetable de-typing UPDATES IN VERSION 5 ==================== New final patch, addressing an issue found with the original fix, which cannot be excluded to be by itself another security issue (not fully addressing the original issue); crashes (assertion failures) have been observed with custom debug builds of patched hypervisors. 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*/* 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 549f56c7a3eacd1fc308a46ac5db32f2191d67e7e25aff501fb2ba26cc979feb xsa240-unstable/0003-x86-dont-wrongly-trigger-linear-page-table-assertion.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 76ba9206fbab686cc8c3b8b21945532b7029cc4725ee1cc38666035152ba87ad xsa240-4.5/0003-x86-dont-wrongly-trigger-linear-page-table-assertion.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 2fe49415a8925dda416fd2594f935ec03c8070bea4a049c1ad242c646fef01e1 xsa240-4.6/0003-x86-dont-wrongly-trigger-linear-page-table-assertion.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 637ef53ca2d6633104abff47be208d87836042af79082666cb818f0ad53b6452 xsa240-4.7/0003-x86-dont-wrongly-trigger-linear-page-table-assertion.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 f174ee608a7f7f0601ae46edafbf443c90a87632609c1b4145fb0e2e5c4b1b51 xsa240-4.8/0003-x86-dont-wrongly-trigger-linear-page-table-assertion.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 4b312010962a294660b2e78a9a5bfd9d537000ceda11e587f88fc49da560c0ff xsa240-4.9/0003-x86-dont-wrongly-trigger-linear-page-table-assertion.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 iQEcBAEBCAAGBQJaDHWkAAoJEIP+FMlX6CvZzoIH/A+QwWwCj2ZFY1XyTpVlRemk oBSRnZiKNin1L8a76gd0pmOUw4oN/bbsZyYIB3A7KvOiVQJ1SlQEyX1oQaDtRj4a VEssmyKQ5tT6c0OWB2MWI5Pgzfr6fjFEtjlK+5sXx2I9ZlgZH1rzkaBZVDpWfDXD Ts6+gBGA8UmmTsRGhOBhXYql+y6kZe+V1ug8hrOUAj21Hx6D7qZXBp8FztflOOa6 9gMcckRQN/7LZYaVCA2knivD33xohveR3XRpIbtRTZ6jy69xBlvk3gxfKc8jrLnd 6Uzhhn0Wbomz+v1ePD0ZsdQkbDTTZ4IdotWdYSSEAgw7xuRS46Q+YOs9ZCytsLI= =NMKG -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; name="xsa240-unstable/0001-x86-limit-linear-page-table-use-to-a-single-level.patch" Content-Disposition: attachment; filename="xsa240-unstable/0001-x86-limit-linear-page-table-use-to-a-single-level.patch" Content-Transfer-Encoding: base64 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 60705 invoked from network); 23 Nov 2017 07:49:24 -0000 Received: from prv-mh.provo.novell.com (HELO prv-mh.provo.novell.com) (137.65.248.74) by server-9.tower-27.messagelabs.com with DHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 23 Nov 2017 07:49:24 -0000 Received: from INET-PRV-MTA by prv-mh.provo.novell.com with Novell_GroupWise; Thu, 23 Nov 2017 00:49:22 -0700 Message-Id: <5A168B9202000078001913D1@prv-mh.provo.novell.com> X-Mailer: Novell GroupWise Internet Agent 14.2.2 Date: Thu, 23 Nov 2017 00:49:22 -0700 From: "Jan Beulich" To: Mime-Version: 1.0 Content-Disposition: inline X-Mailman-Approved-At: Thu, 23 Nov 2017 13:13:26 +0000 Cc: xen-devel Subject: [Xen-announce] Xen 4.7.4 released X-BeenThere: xen-announce@lists.xenproject.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.xenproject.org Sender: "Xen-announce" QWxsLAoKSSBhbSBwbGVhc2VkIHRvIGFubm91bmNlIHRoZSByZWxlYXNlIG9mIFhlbiA0LjcuNC4g VGhpcyBpcwphdmFpbGFibGUgaW1tZWRpYXRlbHkgZnJvbSBpdHMgZ2l0IHJlcG9zaXRvcnkKaHR0 cDovL3hlbmJpdHMueGVuLm9yZy9naXR3ZWIvP3A9eGVuLmdpdDthPXNob3J0bG9nO2g9cmVmcy9o ZWFkcy9zdGFibGUtNC43IAoodGFnIFJFTEVBU0UtNC43LjQpIG9yIGZyb20gdGhlIFhlblByb2pl Y3QgZG93bmxvYWQgcGFnZQpodHRwczovL3hlbnByb2plY3Qub3JnL2Rvd25sb2Fkcy94ZW4tYXJj aGl2ZXMveGVuLXByb2plY3QtNDctc2VyaWVzL3hlbi00NzQuaHRtbCAKKHdoZXJlIGEgbGlzdCBv ZiBjaGFuZ2VzIGNhbiBhbHNvIGJlIGZvdW5kKS4KCldlIHJlY29tbWVuZCBhbGwgdXNlcnMgb2Yg dGhlIDQuNyBzdGFibGUgc2VyaWVzIHRvIHVwZGF0ZSB0byB0aGlzCmxhdGVzdCBwb2ludCByZWxl YXNlLgoKUmVnYXJkcywgSmFuCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KWGVuLWFubm91bmNlIG1haWxpbmcgbGlzdApYZW4tYW5ub3VuY2VAbGlzdHMu eGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3Rp bmZvL3hlbi1hbm5vdW5jZQ== From xen-announce-bounces@lists.xenproject.org Thu Nov 23 13:14:40 2017 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Thu, 23 Nov 2017 13:14:40 +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 1eHrJo-00059u-54; 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 55664 invoked from network); 28 Nov 2017 12:00:33 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-2.tower-206.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 28 Nov 2017 12:00:33 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eJeYn-0001r8-AJ; Tue, 28 Nov 2017 12:00:21 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1eJeYm-0000Mn-Mq; Tue, 28 Nov 2017 12:00:20 +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: Tue, 28 Nov 2017 12:00:20 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 246 - x86: infinite loop due to missing PoD error checking X-BeenThere: xen-announce@lists.xenproject.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.xenproject.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-246 version 2 x86: infinite loop due to missing PoD error checking UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Failure to recognize errors being returned from low level functions in Populate on Demand (PoD) code may result in higher level code entering an infinite loop. IMPACT ====== A malicious HVM guest can cause one pcpu to permanently hang. This normally cascades into the whole system freezing, resulting in a a host Denial of Service (DoS). VULNERABLE SYSTEMS ================== Xen versions from 3.4.x onwards are affected. Only x86 systems are vulnerable. ARM is not vulnerable. x86 PV VMs cannot leverage the vulnerability. Only systems with 2MiB or 1GiB HAP pages enabled are vulnerable. The vulnerability is largely restricted to HVM guests which have been constructed in Populate-on-Demand mode (i.e. with memory < maxmem): x86 HVM domains without PoD (i.e. started with memory == maxmem, or without mentioning "maxmem" in the guest config file) also cannot leverage the vulnerability, in recent enough Xen versions: 4.8.x and later: all versions safe if PoD not configured 4.7.x: 4.7.1 and later safe if PoD not configured 4.6.x: 4.6.4 and later safe if PoD not configured 4.5.x: 4.5.4 and later safe if PoD not configured 4.4.x and earlier: all versions vulnerable even if PoD not configured The commit required to prevent this vulnerability when PoD not configured is 2a99aa99fc84a45f505f84802af56b006d14c52e xen/physmap: Do not permit a guest to populate PoD pages for itself and the corresponding backports. MITIGATION ========== Running only PV guests will avoid this issue. Running HVM guests only in non-PoD mode (maxmem == memory) will also avoid this issue. NOTE: In older releases of Xen, an HVM guest can create PoD entries itself; so this mitigation will not be effective. Specifying "hap_1gb=0 hap_2mb=0" on the hypervisor command line will avoid the vulnerability. Alternatively, running all x86 HVM guests in shadow mode will also avoid this vulnerability. (For example, by specifying "hap=0" in the xl domain configuration file.) CREDITS ======= This issue was discovered by Julien Grall of Linaro. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa246.patch xen-unstable xsa246-4.9.patch Xen 4.9.x, Xen 4.8.x xsa246-4.7.patch Xen 4.7.x, Xen 4.6.x, Xen 4.5.x $ sha256sum xsa246* df08a3be419f2384b495dc52c3e6ebef1eb67d8b562afe85fb6fe6a723334472 xsa246.patch b41550688e88a2a7a22349a07168f3a3ddf6fad8b3389fa27de44ae6731b6a8b xsa246-4.7.patch ea591542774c22db65dcb340120cebf58e759670b5a9fbde42ee93ed594650c8 xsa246-4.9.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, with ONE exception: Removing the ability to boot in populate-on-demand mode is NOT permitted during the embargo on public cloud systems. This is because doing so might alert attackers to the nature of the vulnerability. Deployment of this mitigation is permitted only AFTER the embargo ends. 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 14515 invoked from network); 28 Nov 2017 12:00:35 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-9.tower-206.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 28 Nov 2017 12:00:35 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eJeYq-0001rM-9z; Tue, 28 Nov 2017 12:00:24 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1eJeYq-0000OT-94; Tue, 28 Nov 2017 12:00:24 +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: Tue, 28 Nov 2017 12:00:24 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 247 - Missing p2m error checking in PoD code X-BeenThere: xen-announce@lists.xenproject.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.xenproject.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-247 version 2 Missing p2m error checking in PoD code UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Certain actions require modification of entries in a guest's P2M (Physical-to-Machine) table. When large pages are in use for this table, such an operation may incur a memory allocation (to replace a large mapping with individual smaller ones). If this allocation fails, the p2m_set_entry() function will return an error. Unfortunately, several places in the populate-on-demand code don't check the return value of p2m_set_entry() to see if it succeeded. In some cases, the operation was meant to remove an entry from the p2m table. If this removal fails, a malicious guest may engineer that the page be returned to the Xen free list, making it available to be allocated to another domain, while it retains a writable mapping to the page. In other cases, the operation was meant to remove special populate-on-demand entries; if this removal fails, the internal accounting becomes inconsistent and may eventually hit a BUG(). The allocation involved comes from a separate pool of memory created when the domain is created; under normal operating conditions it never fails, but a malicious guest may be able to engineer situations where this pool is exhausted. IMPACT ====== An unprivileged guest can retain a writable mapping of freed memory. Depending on how this page is used, it could result in either an information leak, or full privilege escalation. Alternatively, an unprivileged guest can cause Xen to hit a BUG(), causing a clean crash - ie, host-wide denial-of-service (DoS). VULNERABLE SYSTEMS ================== All systems from Xen 3.4 are vulnerable. Only x86 systems are vulnerable. ARM is not vulnerable. x86 PV VMs cannot leverage the vulnerability. Only systems with 2MiB or 1GiB HAP pages enabled are vulnerable. The vulnerability is largely restricted to HVM guests which have been constructed in Populate-on-Demand mode (i.e. with memory < maxmem): x86 HVM domains without PoD (i.e. started with memory == maxmem, or without mentioning "maxmem" in the guest config file) also cannot leverage the vulnerability, in recent enough Xen versions: 4.8.x and later: all versions safe if PoD not configured 4.7.x: 4.7.1 and later safe if PoD not configured 4.6.x: 4.6.4 and later safe if PoD not configured 4.5.x: 4.5.4 and later safe if PoD not configured 4.4.x and earlier: all versions vulnerable even if PoD not configured The commit required to prevent this vulnerability when PoD not configured is 2a99aa99fc84a45f505f84802af56b006d14c52e xen/physmap: Do not permit a guest to populate PoD pages for itself and the corresponding backports. MITIGATION ========== Running only PV guests will avoid this issue. Running HVM guests only in non-PoD mode (maxmem == memory) will also avoid this issue. NOTE: In older releases of Xen, an HVM guest can create PoD entries itself; so this mitigation will not be effective. Specifying "hap_1gb=0 hap_2mb=0" on the hypervisor command line will also avoid the vulnerability. Alternatively, running all x86 HVM guests in shadow mode will also avoid this vulnerability. (For example, by specifying "hap=0" in the xl domain configuration file.) CREDITS ======= This issue was discovered by George Dunlap of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa247/*.patch xen-unstable xsa247-4.9/*.patch Xen 4.9.x xsa247-4.8/*.patch Xen 4.8.x xsa247-4.7/*.patch Xen 4.7.x xsa247-4.6/*.patch Xen 4.6.x xsa247-4.5/*.patch Xen 4.5.x $ sha256sum xsa247* xsa247*/* e8fc454c35f429ab60b94c0e812f86fd2b3b37edfff2bfdcc13a7e13ebc2efbe xsa247.meta 59e977d81ad85c25572b79db48d62b4f040026e88f51fe61051b7d30e97fad06 xsa247-4.5/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 6221f5fc7899253888a1711e83436f1b8ddc51046ec920d83b7ea2f4266d13f7 xsa247-4.5/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch f54c4984731f9138e522685e98359a0bb409146091fedb8b7beaac48b3460c22 xsa247-4.6/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 258aaa76e164d70fbfead9de1370577c328dff78c09b81ac7b708fd5c530859a xsa247-4.6/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch 85f0d5f3940bb27f84867b9ac227636a786519dfc1b35ad82f402f9c044ecac9 xsa247-4.7/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 8f0d45b617e0b4c0c1ff490e84c6415f1444696d2afce09eeaa970fbedb8f4c3 xsa247-4.7/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch 580771a125aa577ff4c7607679ef5d8d6c668446f4573bf11e4fe6829d02d157 xsa247-4.8/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch f88d252305d8229374f3fe25bae3c9ea165acab28be9908a1a9a816ae85170ac xsa247-4.8/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch 5fe123448b8ea63f96495462a274d986016264acef4a81e555848ae0d38bd035 xsa247-4.9/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch f6e061be4c6355a8d949d258bf1180ff607ce95ca40213cc0e2ee112db435ebd xsa247-4.9/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch 4cfa8a89f0d2c4a7bf09f31df1e3050b3cce685efd01a17196e991e02d8dd61d xsa247/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 37d7f639af2c857d5232ab69aa9c576c37e6a46a7b246d0cd1cc6d05a93360ba xsa247/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.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, with ONE exception: Removing the ability to boot in populate-on-demand mode is NOT permitted during the embargo on public cloud systems. This is because doing so might alert attackers to the nature of the vulnerability. Deployment of this mitigation is permitted only AFTER the embargo ends. 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 4484 invoked from network); 30 Nov 2017 11:59:54 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-13.tower-27.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 30 Nov 2017 11:59:54 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eKNVJ-0003rP-53; Thu, 30 Nov 2017 11:59:45 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1eKNVJ-0008CT-2J; Thu, 30 Nov 2017 11:59:45 +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, 30 Nov 2017 11:59:45 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 245 (CVE-2017-17046) - ARM: Some memory not scrubbed at boot X-BeenThere: xen-announce@lists.xenproject.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.xenproject.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-2017-17046 / XSA-245 version 2 ARM: Some memory not scrubbed at boot UPDATES IN VERSION 2 ==================== CVE assigned. NOTE REGARDING LACK OF EMBARGO ============================== This bug was discussed publicly before it was realised that it was a security vulnerability. ISSUE DESCRIPTION ================= Data can remain readable in DRAM across soft and even hard reboots. To ensure that sensitive data is not leaked from one domain to another after a reboot, Xen must "scrub" all memory on boot (write it with zeroes). Unfortunately, it was discovered that when memory was in disjoint blocks, or when the first block didn't begin at physical address 0, arithmetic errors meant that some memory was not scrubbed. IMPACT ====== Sensitive information from one domain before a reboot might be visible to another domain after a reboot. VULNERABLE SYSTEMS ================== Only ARM systems are vulnerable. All versions of Xen since 4.5 are vulnerable. Only hardware with disjoint blocks, or physical addresses not starting at 0 are vulnerable; this includes the majority of ARM systems. MITIGATION ========== None. RESOLUTION ========== Applying the appropriate attached patches resolves this issue. xsa245/*.patch All versions of Xen $ sha256sum xsa245* xsa245*/* 121829263b85fcb5eac8e38fb44e77d3aab1dd7ae6ef665bf84bb49e5e161d24 xsa245.meta 526f9e1b127fbb316762ce8e8f4563bc9de0c55a1db581456a3017d570d35bdd xsa245/0001-xen-page_alloc-Cover-memory-unreserved-after-boot-in.patch 7164010112fcccd9cd88e72ace2eeabdb364dd6f4d05c434686267d18067f420 xsa245/0002-xen-arm-Correctly-report-the-memory-region-in-the-du.patch $ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBCAAGBQJaH/KMAAoJEIP+FMlX6CvZMfgH/j86RZD7z55Lt7ITlLWZwucP uTDw8gjJRtB/8mgrJq97Q37rWBHvvfITUYHW7wxA+LJQAje2X7y+3kV4EWpF0hFI BMU3QfeyTCgYbmTb0NOaULGzhDtN/QKjFq48fccnRYfg7MisIEy5dVqDWnbUQfIn STP/w63rpjx2mpZVSBuWC+yA0mjcaCyezR6xJoN1rQjVe/FrnzoJwCYBmpR3JY9+ AIeRvLLpK/vbREZZxOpBioL9KQxH+zahIwQJkS56Jbt8uC1Fq0UFe809Xt+8I4d+ yOJiflkHKgFBW1KUL1Pirq+koad1p66Ciz9c8j88Wop0fhDTQdn10mbteizOM64= =PRKQ -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 7331 invoked from network); 30 Nov 2017 12:00:00 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-14.tower-206.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 30 Nov 2017 12:00:00 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eKNVP-0003rh-Bd; Thu, 30 Nov 2017 11:59:51 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1eKNVP-0008EZ-Au; Thu, 30 Nov 2017 11:59:51 +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, 30 Nov 2017 11:59:51 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 246 (CVE-2017-17044) - x86: infinite loop due to missing PoD error checking X-BeenThere: xen-announce@lists.xenproject.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.xenproject.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-2017-17044 / XSA-246 version 3 x86: infinite loop due to missing PoD error checking UPDATES IN VERSION 3 ==================== CVE assigned. ISSUE DESCRIPTION ================= Failure to recognize errors being returned from low level functions in Populate on Demand (PoD) code may result in higher level code entering an infinite loop. IMPACT ====== A malicious HVM guest can cause one pcpu to permanently hang. This normally cascades into the whole system freezing, resulting in a a host Denial of Service (DoS). VULNERABLE SYSTEMS ================== Xen versions from 3.4.x onwards are affected. Only x86 systems are vulnerable. ARM is not vulnerable. x86 PV VMs cannot leverage the vulnerability. Only systems with 2MiB or 1GiB HAP pages enabled are vulnerable. The vulnerability is largely restricted to HVM guests which have been constructed in Populate-on-Demand mode (i.e. with memory < maxmem): x86 HVM domains without PoD (i.e. started with memory == maxmem, or without mentioning "maxmem" in the guest config file) also cannot leverage the vulnerability, in recent enough Xen versions: 4.8.x and later: all versions safe if PoD not configured 4.7.x: 4.7.1 and later safe if PoD not configured 4.6.x: 4.6.4 and later safe if PoD not configured 4.5.x: 4.5.4 and later safe if PoD not configured 4.4.x and earlier: all versions vulnerable even if PoD not configured The commit required to prevent this vulnerability when PoD not configured is 2a99aa99fc84a45f505f84802af56b006d14c52e xen/physmap: Do not permit a guest to populate PoD pages for itself and the corresponding backports. MITIGATION ========== Running only PV guests will avoid this issue. Running HVM guests only in non-PoD mode (maxmem == memory) will also avoid this issue. NOTE: In older releases of Xen, an HVM guest can create PoD entries itself; so this mitigation will not be effective. Specifying "hap_1gb=0 hap_2mb=0" on the hypervisor command line will avoid the vulnerability. Alternatively, running all x86 HVM guests in shadow mode will also avoid this vulnerability. (For example, by specifying "hap=0" in the xl domain configuration file.) CREDITS ======= This issue was discovered by Julien Grall of Linaro. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa246.patch xen-unstable xsa246-4.9.patch Xen 4.9.x, Xen 4.8.x xsa246-4.7.patch Xen 4.7.x, Xen 4.6.x, Xen 4.5.x $ sha256sum xsa246* df08a3be419f2384b495dc52c3e6ebef1eb67d8b562afe85fb6fe6a723334472 xsa246.patch b41550688e88a2a7a22349a07168f3a3ddf6fad8b3389fa27de44ae6731b6a8b xsa246-4.7.patch ea591542774c22db65dcb340120cebf58e759670b5a9fbde42ee93ed594650c8 xsa246-4.9.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, with ONE exception: Removing the ability to boot in populate-on-demand mode is NOT permitted during the embargo on public cloud systems. This is because doing so might alert attackers to the nature of the vulnerability. Deployment of this mitigation is permitted only AFTER the embargo ends. 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 12560 invoked from network); 30 Nov 2017 12:00:03 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-5.tower-31.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 30 Nov 2017 12:00:03 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eKNVR-0003s1-Tr; Thu, 30 Nov 2017 11:59:53 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1eKNVR-0008GI-Sv; Thu, 30 Nov 2017 11:59:53 +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, 30 Nov 2017 11:59:53 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 247 (CVE-2017-17045) - Missing p2m error checking in PoD code X-BeenThere: xen-announce@lists.xenproject.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.xenproject.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-2017-17045 / XSA-247 version 3 Missing p2m error checking in PoD code UPDATES IN VERSION 3 ==================== CVE assigned. Fixed "Reported-by" tags in patch commit messages. ISSUE DESCRIPTION ================= Certain actions require modification of entries in a guest's P2M (Physical-to-Machine) table. When large pages are in use for this table, such an operation may incur a memory allocation (to replace a large mapping with individual smaller ones). If this allocation fails, the p2m_set_entry() function will return an error. Unfortunately, several places in the populate-on-demand code don't check the return value of p2m_set_entry() to see if it succeeded. In some cases, the operation was meant to remove an entry from the p2m table. If this removal fails, a malicious guest may engineer that the page be returned to the Xen free list, making it available to be allocated to another domain, while it retains a writable mapping to the page. In other cases, the operation was meant to remove special populate-on-demand entries; if this removal fails, the internal accounting becomes inconsistent and may eventually hit a BUG(). The allocation involved comes from a separate pool of memory created when the domain is created; under normal operating conditions it never fails, but a malicious guest may be able to engineer situations where this pool is exhausted. IMPACT ====== An unprivileged guest can retain a writable mapping of freed memory. Depending on how this page is used, it could result in either an information leak, or full privilege escalation. Alternatively, an unprivileged guest can cause Xen to hit a BUG(), causing a clean crash - ie, host-wide denial-of-service (DoS). VULNERABLE SYSTEMS ================== All systems from Xen 3.4 are vulnerable. Only x86 systems are vulnerable. ARM is not vulnerable. x86 PV VMs cannot leverage the vulnerability. Only systems with 2MiB or 1GiB HAP pages enabled are vulnerable. The vulnerability is largely restricted to HVM guests which have been constructed in Populate-on-Demand mode (i.e. with memory < maxmem): x86 HVM domains without PoD (i.e. started with memory == maxmem, or without mentioning "maxmem" in the guest config file) also cannot leverage the vulnerability, in recent enough Xen versions: 4.8.x and later: all versions safe if PoD not configured 4.7.x: 4.7.1 and later safe if PoD not configured 4.6.x: 4.6.4 and later safe if PoD not configured 4.5.x: 4.5.4 and later safe if PoD not configured 4.4.x and earlier: all versions vulnerable even if PoD not configured The commit required to prevent this vulnerability when PoD not configured is 2a99aa99fc84a45f505f84802af56b006d14c52e xen/physmap: Do not permit a guest to populate PoD pages for itself and the corresponding backports. MITIGATION ========== Running only PV guests will avoid this issue. Running HVM guests only in non-PoD mode (maxmem == memory) will also avoid this issue. NOTE: In older releases of Xen, an HVM guest can create PoD entries itself; so this mitigation will not be effective. Specifying "hap_1gb=0 hap_2mb=0" on the hypervisor command line will also avoid the vulnerability. Alternatively, running all x86 HVM guests in shadow mode will also avoid this vulnerability. (For example, by specifying "hap=0" in the xl domain configuration file.) CREDITS ======= This issue was discovered by George Dunlap of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa247/*.patch xen-unstable xsa247-4.9/*.patch Xen 4.9.x xsa247-4.8/*.patch Xen 4.8.x xsa247-4.7/*.patch Xen 4.7.x xsa247-4.6/*.patch Xen 4.6.x xsa247-4.5/*.patch Xen 4.5.x $ sha256sum xsa247* xsa247*/* e8fc454c35f429ab60b94c0e812f86fd2b3b37edfff2bfdcc13a7e13ebc2efbe xsa247.meta 3a8c0e02e9c94f68119f21a334ef70c409b71270c7de223d7d9163dbc1cfa286 xsa247-4.5/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 6851ec78da2e91b03c8f3016311d32354a4dacf99ad20ea4f5dc1ed493d42a60 xsa247-4.5/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch dce7e6c1961a85f59d20a3a98ea02d677a4956c3caf5273ea0b890d977cda3e5 xsa247-4.6/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 110de2762531654b77fc38e4f2ee0bae76233e59557c6f6190e839065f9563cc xsa247-4.6/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch d149342e4d40dfb550f8af6d05cd20a34889d64fb33f967fe77cf89b4ea8504a xsa247-4.7/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 3c8a7bfdb408af0224cf6f5471b0fd9dd1a9a1ded7207e427b02268ca2906aa6 xsa247-4.7/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch 7ddbd99a30dcddc9a4e0dc7e2f4cfa63abb6237c6d9a706b729cf9df5f34b869 xsa247-4.8/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 4574e27bb76d6dbb357b4dd8efa5fbbbffa69d17ea9c8f8330d3ef19f6cb3fce xsa247-4.8/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch 2d0656e84be3b8eb828c199463c5532bddd16cf6e1159ce512a304ef85359422 xsa247-4.9/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch f7429ae9fc9934d3a91aa6f3b9d2dc7a7e464128e4e2a8a71e7c8f26affdb731 xsa247-4.9/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.patch 024bce64257936048dff6cd66a0ba3212985cad42e78357a1c3513873099ebe2 xsa247/0001-p2m-Always-check-to-see-if-removing-a-p2m-entry-actu.patch 32bb016003d7c37452222cacf22e74b4d29a227d6a808ae89c83293a2bd12f40 xsa247/0002-p2m-Check-return-value-of-p2m_set_entry-when-decreas.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, with ONE exception: Removing the ability to boot in populate-on-demand mode is NOT permitted during the embargo on public cloud systems. This is because doing so might alert attackers to the nature of the vulnerability. Deployment of this mitigation is permitted only AFTER the embargo ends. 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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542fc804-d5ed-11e7-b4a6-bc764e045a96; Thu, 30 Nov 2017 17:41:36 +0100 (CET) X-IronPort-AV: E=Sophos;i="5.45,341,1508803200"; d="scan'208";a="461079361" From: Ian Jackson MIME-Version: 1.0 Message-ID: <23072.13165.165395.930719@mariner.uk.xensource.com> Date: Thu, 30 Nov 2017 16:35:57 +0000 To: X-Mailer: VM 8.2.0b under 24.4.1 (i586-pc-linux-gnu) Subject: [Xen-announce] Xen Project incoming email domains, spamfiltering X-BeenThere: xen-announce@lists.xenproject.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.xenproject.org Sender: "Xen-announce" V2UgaGF2ZSBqdXN0IGNoYW5nZWQgb3VyIG91dHNvdXJjZWQgc3BhbWZpbHRlcmluZyBwcm92aWRl ciwgZm9yCmluYm91bmQgbWFpbCBzZW50IHRvIGFkZHJlc3NlcyBAeGVucHJvamVjdC5vcmcsIEBs aXN0cy54ZW5wcm9qZWN0Lm9yZwphbmQgdmFyaW91cyBsZWdhY3kgZG9tYWlucyBsaWtlIEB4ZW4u 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