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banners=-,-,- X-VirusChecked: Checked Received: (qmail 7233 invoked from network); 2 Jun 2017 16:15:53 -0000 Received: from foss.arm.com (HELO foss.arm.com) (217.140.101.70) by server-13.tower-206.messagelabs.com with SMTP; 2 Jun 2017 16:15:53 -0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1FBDA15A2; Fri, 2 Jun 2017 09:15:52 -0700 (PDT) Received: from [10.37.12.100] (unknown [10.37.12.100]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 036E43F58B; Fri, 2 Jun 2017 09:15:50 -0700 (PDT) To: "committers@xenproject.org" , xen-announce@lists.xenproject.org, xen-users@lists.xenproject.org, xen-devel From: Julien Grall Message-ID: <1b03c28c-42c7-fc47-4e76-a4179eeffce5@arm.com> Date: Fri, 2 Jun 2017 17:15:49 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 Content-Language: en-US X-Mailman-Approved-At: Fri, 02 Jun 2017 16:17:33 +0000 Cc: Lars Kurth Subject: [Xen-announce] Xen 4.9: Release date 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; 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 64033 invoked from network); 6 Jun 2017 16:10:29 -0000 Received: from foss.arm.com (HELO foss.arm.com) (217.140.101.70) by server-15.tower-27.messagelabs.com with SMTP; 6 Jun 2017 16:10:29 -0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id DE31E1596; Tue, 6 Jun 2017 09:10:28 -0700 (PDT) Received: from [10.1.206.53] (e108454-lin.cambridge.arm.com [10.1.206.53]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1C1C73F578; Tue, 6 Jun 2017 09:10:27 -0700 (PDT) To: xen-devel , xen-announce@lists.xenproject.org, "xen-users@lists.xen.org" From: Julien Grall Message-ID: <1c81f6aa-3f03-bbc9-27eb-84ace18a258d@arm.com> Date: Tue, 6 Jun 2017 17:10:26 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 X-Mailman-Approved-At: Tue, 06 Jun 2017 16:11:37 +0000 Cc: "lars.kurth@citrix.com" Subject: [Xen-announce] Xen 4.9 rc8 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; 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 41629 invoked from network); 13 Jun 2017 15:54:28 -0000 Received: from smtp.citrix.com (HELO SMTP.CITRIX.COM) (66.165.176.89) by server-9.tower-21.messagelabs.com with RC4-SHA encrypted SMTP; 13 Jun 2017 15:54:28 -0000 X-IronPort-AV: E=Sophos;i="5.39,338,1493683200"; d="scan'208";a="427689184" From: Ian Jackson MIME-Version: 1.0 Message-ID: <22848.2736.991895.281689@mariner.uk.xensource.com> Date: Tue, 13 Jun 2017 16:54:24 +0100 To: In-Reply-To: <22803.6113.486674.72765@mariner.uk.xensource.com> References: <22803.6113.486674.72765@mariner.uk.xensource.com> X-Mailer: VM 8.2.0b under 24.4.1 (i586-pc-linux-gnu) Cc: security-team-members@xenproject.org Subject: [Xen-announce] Reminder: Vulnerability embargo dates - add your public holidays 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; 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banners=-,-,- X-VirusChecked: Checked Received: (qmail 13068 invoked from network); 20 Jun 2017 12:00:21 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-10.tower-206.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 20 Jun 2017 12:00:21 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNHpH-0004EM-O8; Tue, 20 Jun 2017 12:00:07 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1dNHpH-000643-NI; Tue, 20 Jun 2017 12:00:07 +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, 20 Jun 2017 12:00:07 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 220 - x86: PKRU and BND* leakage between vCPU-s 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-220 version 2 x86: PKRU and BND* leakage between vCPU-s UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Memory Protection Extensions (MPX) and Protection Key (PKU) are features in newer processors, whose state is intended to be per-thread and context switched along with all other XSAVE state. Xen's vCPU context switch code would save and restore the state only if the guest had set the relevant XSTATE enable bits. However, surprisingly, the use of these features is not dependent (PKU) or may not be dependent (MPX) on having the relevant XSTATE bits enabled. VMs which use MPX or PKU, and context switch the state manually rather than via XSAVE, will have the state leak between vCPUs (possibly, between vCPUs in different guests). This in turn corrupts state in the destination vCPU, and hence may lead to weakened protections Experimentally, MPX appears not to make any interaction with BND* state if BNDCFGS.EN is set but XCR0.BND{CSR,REGS} are clear. However, the SDM is not clear in this case; therefore MPX is included in this advisory as a precaution. IMPACT ====== There is an information leak, of control information mentioning pointers into guest address space; this may weaken address space randomisation and make other attacks easier. When an innocent guest acquires leaked state, it will run with incorrect protection state. This could weaken the protection intended by the MPX or PKU features, making other attacks easier which would otherwise be excluded; and the incorrect state could also cause a denial of service by preventing legitimate accesses. VULNERABLE SYSTEMS ================== Xen 4.4 and earlier are not vulnerable, as they do not use or expose MPX or PKU to guests. Xen 4.5 and later expose MPX to guests. Xen 4.7 and later expose PKU to guests. Therefore, Xen 4.5 and later are vulnerable. Only x86 hardware implementing the MPX or PKU features is vulnerable. At the time of writing, these are Intel Skylake (and later) processors for MPX, and Intel Skylake Server (and later) processors for PKU. ARM hardware is not vulnerable. The vulnerability is only exposed to HVM guests. PV guests cannot exploit the vulnerability. Vulnerable guest operating systems - ---------------------------------- Guests which use XSAVE for context switching PKU and MPX state are not vulnerable to inbound corruption caused by another malicious domain. With respect to PKU, the remaining outbound information leak is of no conceivable consequence. And, experimentally, MPX does not appear to have a real vulnerability, even though the CPU documentation is not clear. Therefore we think that these guests (those which use XSAVE) are not vulnerable. Linux uses XSAVE, so is therefore not vulnerable. MITIGATION ========== Passing "pku=0" on the hypervisor command line will avoid the PKU vulnerability (by not advertising the feature to guests). There is no corresponding option for the probably-theoretical MPX vulnerability. CREDITS ======= This issue was discovered by Andrew Cooper of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa220.patch xen-unstable xsa220-4.8.patch Xen 4.8 xsa220-4.7.patch Xen 4.7 xsa220-4.6.patch Xen 4.6 xsa220-4.5.patch Xen 4.5 $ sha256sum xsa220* 8b86d9a284c0b14717467e672e63aebfc2bce201658493a54c64fb7c1863ce49 xsa220.patch 4b53ad5748313fb92c68eac1160b00d1bf7310019657028122a455855334252b xsa220-4.5.patch befe5ca5321d903428fc496abeee3a3b5eb0cee27a382e20d3caf8cc7bdfced2 xsa220-4.6.patch 555fa741348909943393aaf73571bc7817b30eafcff73dbfcd73911113db5d7f xsa220-4.7.patch 7a41ad9c6f9d46536abae051c517456bdfa3564278e98f80222a904df749fb0c xsa220-4.8.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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([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNHpJ-0004FA-HC; Tue, 20 Jun 2017 12:00:09 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1dNHpJ-00069v-G6; Tue, 20 Jun 2017 12:00:09 +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, 20 Jun 2017 12:00:09 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 224 - grant table operations mishandle reference counts 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-224 version 4 grant table operations mishandle reference counts UPDATES IN VERSION 4 ==================== Correct 4.5 backports (first patch had an issue which then was corrected by last one). Public release. ISSUE DESCRIPTION ================= We have discovered a number of bugs in the code mapping and unmapping grant references. * If a grant is mapped with both the GNTMAP_device_map and GNTMAP_host_map flags, but unmapped only with host_map, the device_map portion remains but the page reference counts are lowered as though it had been removed. This bug can be leveraged cause a page's reference counts and type counts to fall to zero while retaining writeable mappings to the page. * Under some specific conditions, if a grant is mapped with both the GNTMAP_device_map and GNTMAP_host_map flags, the operation may not grab sufficient type counts. When the grant is then unmapped, the type count will be erroneously reduced. This bug can be leveraged cause a page's reference counts and type counts to fall to zero while retaining writeable mappings to the page. * When a grant reference is given to an MMIO region (as opposed to a normal guest page), if the grant is mapped with only the GNTMAP_device_map flag set, a mapping is created at host_addr anyway. This does *not* cause reference counts to change, but there will be no record of this mapping, so it will not be considered when reporting whether the grant is still in use. IMPACT ====== For the worst issue, a PV guest could gain a writeable mapping of its own pagetable, allowing it to escalate its privileges to that of the host. VULNERABLE SYSTEMS ================== All versions of Xen are vulnerable. Only x86 systems are vulnerable. Any system running untrusted PV guests is vulnerable. Systems with untrusted HVM guests are only vulnerable if those guests are served by a trusted PV backend which is vulnerable: Namely, one which calls grant_map() with both the GNTMAP_device_map and GNTMAP_host_map flags. The security team is not aware of any backends which are vulnerable. MITIGATION ========== Running only HVM guests will avoid this vulnerability. CREDITS ======= This issue was discovered by Jan Beulich of SUSE. RESOLUTION ========== Applying the appropriate set of attached patched resolves this issue. Note that these patches are assumed to be applied on top of the XSA-218 ones; not doing so may cause at least mechanical problems of applying the ones here. xsa224-unstable/*.patch xen-unstable xsa224-4.8/*.patch Xen 4.8.x xsa224-4.7/*.patch Xen 4.7.x xsa224-4.6/*.patch Xen 4.6.x xsa224-4.5/*.patch Xen 4.5.x $ sha256sum xsa224*/* db39535185c1879775b62873fbed1e6285300ec1e1bd5d09ac2d96a98ac6443c xsa224-unstable/0001-gnttab-Fix-handling-of-dev_bus_addr-during-unmap.patch 1588257f5b0c7113cd478475014f56fbeb6e79de7acbe67cf6d7a265e2b3fa15 xsa224-unstable/0002-gnttab-never-create-host-mapping-unless-asked-to.patch a7517ca0e253fb9fb5b1ea1e56d04167f32ef87be145462a15241af26e4e0d65 xsa224-unstable/0003-gnttab-correct-logic-to-get-page-references-during-m.patch 951217a88f9c945eb9f7933cd66615aef955206fab955020334ac54da05663fa xsa224-unstable/0004-gnttab-__gnttab_unmap_common_complete-is-all-or-noth.patch 190470fbd77fca58aab89a9bd034732525ce8f7ce7c417a0ca5d25b366639baa xsa224-4.5/0001-gnttab-Fix-handling-of-dev_bus_addr-during-unmap.patch 9374e4dd6666a63fb32e6cfbdc95071b0cc153ff7cb2d2efdd98468e0e079605 xsa224-4.5/0002-gnttab-never-create-host-mapping-unless-asked-to.patch d825e6fa5827e28e3755c92b274044666cc91b6a8cbc16e2081f43e0371991d4 xsa224-4.5/0003-gnttab-correct-logic-to-get-page-references-during-m.patch d3aaffaf487a84e43fe10f7dec5af72b64d1b2315440c36335a0ed8ec1439ca1 xsa224-4.5/0004-gnttab-__gnttab_unmap_common_complete-is-all-or-noth.patch c6cd6b82ef774bec5eaad5f32e767c917bc7ad2a73ee81d3f7eef67aaf1a1330 xsa224-4.6/0001-gnttab-Fix-handling-of-dev_bus_addr-during-unmap.patch db32d15757c9d147c7e89eebd10a16324e59141fbb5ce3feb87fc9bf01864a6a xsa224-4.6/0002-gnttab-never-create-host-mapping-unless-asked-to.patch 6bc9bbcf320d673822bd41545a014bd998294d06c5b38d79a6badf1a154ed0d6 xsa224-4.6/0003-gnttab-correct-logic-to-get-page-references-during-m.patch 088064fec3192928f205b34b808ca40fd685a8ba5037bb665ed0a4f87d6d4035 xsa224-4.6/0004-gnttab-__gnttab_unmap_common_complete-is-all-or-noth.patch cdd93fb950b823cf96fe52685f6394c1b5e0a1e3d7d3c961a5e781da83551a9f xsa224-4.7/0001-gnttab-Fix-handling-of-dev_bus_addr-during-unmap.patch 0583da31891084b2557a9623bc2b11a480e296004a8716b91c79fe28a824a6e0 xsa224-4.7/0002-gnttab-never-create-host-mapping-unless-asked-to.patch 2323bf581a835f152285b98ed2e4b5b503b0f67bd8e3449d33e8fe03b14ce064 xsa224-4.7/0003-gnttab-correct-logic-to-get-page-references-during-m.patch b4f4adb1ea850e0174e51f76da7e97769211977c71809bd62102d33d90444b09 xsa224-4.7/0004-gnttab-__gnttab_unmap_common_complete-is-all-or-noth.patch 88b20e6765f0bfffe7598215f3a8e25c0931dbe3c7223cb3c08f998842cfc14b xsa224-4.8/0001-gnttab-Fix-handling-of-dev_bus_addr-during-unmap.patch ce62c97f470d6fbf557f50be8936051e91592a6330527515b7cdb187a0d633b2 xsa224-4.8/0002-gnttab-never-create-host-mapping-unless-asked-to.patch 5fd8cd67737c6a038d6c47fcf3c5bd2d238f4ac361538d650292ee185bda8000 xsa224-4.8/0003-gnttab-correct-logic-to-get-page-references-during-m.patch f9c65c7f04063872602c609d2fc3caffc44716b3d378569969a7884abe881a19 xsa224-4.8/0004-gnttab-__gnttab_unmap_common_complete-is-all-or-noth.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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X-StarScan-Received: X-StarScan-Version: 9.4.19; banners=-,-,- X-VirusChecked: Checked Received: (qmail 34638 invoked from network); 20 Jun 2017 12:00:14 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-15.tower-21.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 20 Jun 2017 12:00:14 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNHpG-0004Dy-50; Tue, 20 Jun 2017 12:00:06 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1dNHpG-0005zH-0I; Tue, 20 Jun 2017 12:00:06 +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, 20 Jun 2017 12:00:06 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 216 - blkif responses leak backend stack data 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-216 version 3 blkif responses leak backend stack data UPDATES IN VERSION 3 ==================== Public release. Fix a typo ("our" for "or" in Vulnerable Systems). ISSUE DESCRIPTION ================= The block interface response structure has some discontiguous fields. Certain backends populate the structure fields of an otherwise uninitialized instance of this structure on their stacks, leaking data through the (internal or trailing) padding field. IMPACT ====== A malicious unprivileged guest may be able to obtain sensitive information from the host or other guests. VULNERABLE SYSTEMS ================== All Linux versions supporting the xen-blkback, blkback, or blktap drivers are vulnerable. FreeBSD, NetBSD and Windows (with or without PV drivers) are not vulnerable (either because they do not have backends at all, or because they use a different implementation technique which does not suffer from this problem). All qemu versions supporting the Xen block backend are vulnerable. The qemu-xen-traditional code base does not include such code, so is not vulnerable. Note that an instance of qemu will be spawned to provide the backend for most non-raw-format disks; so you may need to apply the patch to qemu even if you use only PV guests. MITIGATION ========== There's no mitigation available for x86 PV and ARM guests. For x86 HVM guests it may be possible to change the guest configuaration such that a fully virtualized disk is being made available instead. However, this would normally entail changes inside the guest itself. CREDITS ======= This issue was discovered by Anthony Perard of Citrix. For patch: Reported by: Anthony Perard RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa216-linux-4.11.patch Linux 4.5 ... 4.11 xsa216-linux-4.4.patch Linux 3.3 ... 4.4 xsa216-qemuu.patch qemu-upstream master, 4.8 xsa216-qemuu-4.7.patch qemu-upstream 4.7, 4.6 xsa216-qemuu-4.5.patch qemu-upstream 4.5 xsa216-linux-2.6.18-xen.patch linux-2.6.18-xen.hg $ sha256sum xsa216* 28beb3d876fa0eee77f4377ef2708d764a5d9a2003dd4f1a4ecb9b8bf60658a4 xsa216-linux-2.6.18-xen.patch 6f6138c0a00df4ed7307ae4e5ee30dbe8594ff05bc1e8fdc7cfd785077d72ddc xsa216-linux-4.4.patch e04da27961cd867f7bbba31677f61e3e425c0e7cc7352a7a2d22b5a35eaf8585 xsa216-linux-4.11.patch 850b0143cfe3c69c62abdad71be9813014d46c380109fc650689a10c90ff39f4 xsa216-qemuu.patch 072270274d2554b71579a529c908d16479f8eba6646d8aed2e3d129495b27716 xsa216-qemuu-4.5.patch 5a64e2c5bb78f1c8fae97354be10fcc63ea39d333d6490e3a422ff30460cdef1 xsa216-qemuu-4.7.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. However, deployment of the mitigation is NOT permitted (except where all the affected systems and VMs are administered and used only by organisations which are members of the Xen Project Security Issues Predisclosure List). Specifically, deployment on public cloud systems is NOT permitted. This is because this produces a guest-visible change which will indicate which component contains the vulnerability. Additionally, 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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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, 20 Jun 2017 12:00:06 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 217 - page transfer may allow PV guest to elevate privilege 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-217 version 2 page transfer may allow PV guest to elevate privilege UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Domains controlling other domains are permitted to map pages owned by the domain being controlled. If the controlling domain unmaps such a page without flushing the TLB, and if soon after the domain being controlled transfers this page to another PV domain (via GNTTABOP_transfer or, indirectly, XENMEM_exchange), and that third domain uses the page as a page table, the controlling domain will have write access to a live page table until the applicable TLB entry is flushed or evicted. Note that the domain being controlled is necessarily HVM, while the controlling domain is PV. IMPACT ====== A malicious pair of guests 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 are vulnerable. Only x86 systems are affected. ARM systems are not vulnerable. Only systems where an attacker can control both a PV and an HVM guest are vulnerable. This must be presumed to include systems containing HVM domains with service domains such as stub domain device models. Systems containing only PV guests are not vulnerable. Systems containing only HVM domains serviced by dom0 device model processes are not vulnerable. Note that with libxl, xl, and libvirt, HVM domains use dom0 device model processes by default. MITIGATION ========== There is no mitigation for this vulnerability. Switching from stub device models to dom0 process device models is not recommended as a mitigation, as in practice the vulnerability is likely to be hard to exploit through this route; whereas dom0 process device models may have unknown vulnerabilities. CREDITS ======= This issue was discovered by Jann Horn of Google Project Zero. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa217.patch xen-unstable, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x xsa217-4.5.patch Xen 4.5.x $ sha256sum xsa217* 3e896412389d8e59e417ea7bb3d5b47a20de27b8eae0420c98071ce4b17d219c xsa217.patch 4e555cf47faf5e8d2bba4ff8a31fbe72fb11a6c0e3b286f23b26e684a1809705 xsa217-4.5.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 12265 invoked from network); 20 Jun 2017 12:00:17 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-4.tower-31.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 20 Jun 2017 12:00:17 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNHpI-0004Ei-KX; Tue, 20 Jun 2017 12:00:08 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1dNHpI-00066n-Jg; Tue, 20 Jun 2017 12:00:08 +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, 20 Jun 2017 12:00:08 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 222 - stale P2M mappings due to insufficient error checking 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-222 version 2 stale P2M mappings due to insufficient error checking UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Certain actions require removing pages from a guest's P2M (Physical-to-Machine) mapping. When large pages are in use to map guest pages in the 2nd-stage page tables, such a removal operation may incur a memory allocation (to replace a large mapping with individual smaller ones). If this allocation fails, these errors are ignored by the callers, which would then continue and (for example) free the referenced page for reuse. This leaves the guest with a mapping to a page it shouldn't have access to. 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 ====== A malicious guest may be able to access memory it doesn't own, potentially allowing privilege escalation, host crashes, or information leakage. VULNERABLE SYSTEMS ================== Xen versions from at least 3.2 onwards are vulnerable. Older versions have not been inspected. Both x86 and ARM systems are vulnerable. On x86 systems, only HVM guests can leverage the vulnerability. MITIGATION ========== On x86, 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.) There is no known mitigation on ARM systems. CREDITS ======= This issue was discovered by Julien Grall of ARM. RESOLUTION ========== Applying the appropriate pair of attached patches resolves this issue. xsa222-[12].patch xen-unstable xsa222-1.patch, xsa222-2-4.8.patch Xen 4.8.x xsa222-[12]-4.7.patch Xen 4.7.x xsa222-[12]-4.6.patch Xen 4.6.x xsa222-1-4.6.patch, xsa222-2-4.5.patch Xen 4.5.x $ sha256sum xsa222* 8bd8807ee1cfe01c86194f5d5be38618ba5e0c1206667bb119ed952e5d155c1a xsa222-1.patch 9288dfcae1f37e6c8f13910046f43ec161710abb7c94a9346b7e0eaba3258ccd xsa222-1-4.6.patch ebc2c070bad8012a196e984b568a72e013ff072bb077870508f09ed053c1a4c2 xsa222-1-4.7.patch ee320b37b365cb3b6660e559902ff8bb50657b2a28ff0fa7ebaf9ffd33fc0942 xsa222-2.patch 97768f4fe564f702de8e4aebd0c4d24858814ebbb7be532b376cfae7ad6834a4 xsa222-2-4.5.patch 4142f76673b996b65301d52216cbf56e27b0c86e5607f6a9eb18dcc7df3f6343 xsa222-2-4.6.patch a640e190b32e82f5ec7ee4968bf8b9f22137e8379314cc9a29556637c3dc8e87 xsa222-2-4.7.patch ab43bd590139bed53957b3b37b854183c69bee26cf7cb00900e3f4a150d067a5 xsa222-2-4.8.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: Tue, 20 Jun 2017 12:00:08 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 221 - NULL pointer deref in event channel poll 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-221 version 2 NULL pointer deref in event channel poll UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= When polling event channels, in general arbitrary port numbers can be specified. Specifically, there is no requirement that a polled event channel ports has ever been created. When the code was generalised from an earlier implementation, introducing some intermediate pointers, a check should have been made that these intermediate pointers are non-NULL. However, that check was omitted. IMPACT ====== A malicious or buggy guest may cause the hypervisor to access addresses it doesn't control, usually leading to a host crash (Denial of Service). Information leaks cannot be excluded. VULNERABLE SYSTEMS ================== Xen versions 4.4 and newer are vulnerable. Xen versions 4.3 and earlier are not affected. Both x86 and ARM systems are vulnerable. While all guest kinds can cause a Denial of Service, only x86 PV guests may be able to leverage the possible information leaks. MITIGATION ========== There is no known mitigation. CREDITS ======= This issue was discovered by Ankur Arora of Oracle. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa221.patch Xen 4.4.x and later, including xen-unstable $ sha256sum xsa221* 2425396a713466808b0f75f91337be4dd20a4dee7733972b04489773c6e97655 xsa221.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 iQEcBAEBCAAGBQJZSQ3TAAoJEIP+FMlX6CvZw20H/jCUm+eX4rPUCQ6CL+Ya/dXH th34nPKQnq60gm3469sDQQMNbuvfgBItAAAjO87NC6P2BSyYPMny5SvqSsmkWow1 8OkAWq5ZZ3L7ksPhkP6aco+ks1a99SxJX4YfjwOFq9ct6/zfrcW1ThEqs9j87JeP 6RGPYgXc0mP9IOk27JnUVgiej7/v4a8v5FcWrG3bHpw2vp9tY3hdvkfc6wJiuplx kkqIVkqTpCNu7QYGv3de1RpDeI5mN8TGY+6ahs9eZFEFmRGWiAahhZRnwGVNE7Tl QcHzaphlzp/etub8sHgZPH90xLaeILJ+9oz29b/SLUVqahRxzTD1bLUElEu2su0= =xR3U -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; name="xsa221.patch" Content-Disposition: attachment; filename="xsa221.patch" Content-Transfer-Encoding: base64 RnJvbTogSmFuIEJldWxpY2ggPGpiZXVsaWNoQHN1c2UuY29tPgpTdWJqZWN0 OiBldnRjaG46IGF2b2lkIE5VTEwgZGVyZWZzCgpDb21taXQgZmJiZDUwMDll NiAoImV2dGNobjogcmVmYWN0b3IgbG93LWxldmVsIGV2ZW50IGNoYW5uZWwg 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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, 20 Jun 2017 12:00:07 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 219 - x86: insufficient reference counts during shadow emulation 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-219 version 2 x86: insufficient reference counts during shadow emulation UPDATES IN VERSION 2 ==================== Public release. Add caveat about exploitability by a single HVM guest, to Impact. ISSUE DESCRIPTION ================= When using shadow paging, writes to guest pagetables must be trapped and emulated, so the shadows can be suitably adjusted as well. When emulating the write, Xen maps the guests pagetable(s) to make the final adjustment and leave the guest's view of its state consistent. However, when mapping the frame, Xen drops the page reference before performing the write. This is a race window where the underlying frame can change ownership. One possible attack scenario is for the frame to change ownership and to be inserted into a PV guest's pagetables. At that point, the emulated write will be an unaudited modification to the PV pagetables whose value is under guest control. IMPACT ====== A malicious pair of guests may be able to elevate their privilege to that of Xen. We have not ruled out the possibility that a single malicious HVM guest may be able to elevate their privilege to that of Xen. VULNERABLE SYSTEMS ================== All versions of Xen are vulnerable. Only x86 systems are affected. ARM systems are not vulnerable. HVM guests using shadow mode paging can exploit this vulnerability. HVM guests using Hardware Assisted Paging (HAP) cannot exploit this vulnerability. To discover whether your HVM guests are using HAP, or shadow page tables: request debug key `q' (from the Xen console, or with `xl debug-keys q'). This will print (to the console, and visible in `xl dmesg'), debug information for every domain, containing something like this: (XEN) General information for domain 2: (XEN) refcnt=1 dying=2 pause_count=2 (XEN) nr_pages=2 xenheap_pages=0 shared_pages=0 paged_pages=0 dirty_cpus={} max_pages=262400 (XEN) handle=ef58ef1a-784d-4e59-8079-42bdee87f219 vm_assist=00000000 (XEN) paging assistance: hap refcounts translate external ^^^ The presence of `hap' here indicates that the host is not vulnerable to this domain. For an HVM domain the presence of `shadow' indicates that the domain can exploit the vulnerability. Xen 4.6 and later have the option to compile-out shadow paging support. (The default is to compile with shadow paging support). If Xen is built without shadow support, it is not vulnerable. Exploiting this race condition requires coordination between an x86 HVM guest using shadow paging, and a PV guest. Running only HVM guests avoids the vulnerability, unless stub device models are in use (since stub device models are PV domains, each controlled by the corresponding guest). Running only PV guests avoids the vulnerability. MITIGATION ========== 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. (This mitigation is not applicable to PV guests.) CREDITS ======= This issue was discovered by Andrew Cooper of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa219.patch xen-unstable xsa219-4.8.patch Xen 4.8, 4.7 xsa219-4.6.patch Xen 4.6 xsa219-4.5.patch Xen 4.5, 4.4 $ sha256sum xsa219* d06759d11dad3b128e65ade9e6afc1c728b65457cc32c34f46690f959c48644f xsa219.patch 0dd27ad66f964ba163dbc72e3a074d171b0e1edf9b322d811feb7f5c1deb4437 xsa219-4.5.patch d5fdd9d75dbad4a2315f48f8aec5dd3a10b92307320b5c141e2c1e69e422510c xsa219-4.6.patch a2023599abbc3b8f46cd430bec154401ef166493fcb5787f2f6fb9802b12f9b4 xsa219-4.8.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.) 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 iQEcBAEBCAAGBQJZSQ3PAAoJEIP+FMlX6CvZI5sIAITAsYzu8vcLGz2erkTQOFQ/ 87MWZ/OPMHZISeG9Y1lEUYNJ0I/pkvEe6HHGpL1JZegtBkuuMnLIb4XfPFvIuVOs pwETinpd+FkmhpfPWDc6vKaS9tYUZFi/h7ORcJTn/j6/JWoaqdbCJC+x1hI5UhsA 6iZHNQuuSIM1WH7pAyywhzovsoTnsI5pBYU69cDO6szo7Ig34BmVpliin2qkp0TV T673fktUoZWcYZK05TvFbAkG7UCQk1Wu46eiHx2SB+dFZ2wXdtxCZnCY5guCrF1i BqAiJj+MrYMZ38yfoY3XgoIcam3pQTai8bYo5xj8Jcuws0cPK9ja2LBwfHv0YTM= =Eoho -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; name="xsa219.patch" Content-Disposition: attachment; filename="xsa219.patch" Content-Transfer-Encoding: base64 RnJvbSBkZTc4MmMwZTEwNmM5ZWUwMTE3M2Q1MDVhMjU0YTVlZGJhZmI4ZTQw IE1vbiBTZXAgMTcgMDA6MDA6MDAgMjAwMQpGcm9tOiBBbmRyZXcgQ29vcGVy IDxhbmRyZXcuY29vcGVyM0BjaXRyaXguY29tPgpEYXRlOiBUaHUsIDExIE1h 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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, 20 Jun 2017 12:00:09 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 225 - arm: vgic: Out-of-bound access when sending SGIs 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-225 version 2 arm: vgic: Out-of-bound access when sending SGIs UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= ARM guests can send SGI (i.e. IPI) targeting a list of vCPUs using the MMIO register GICD_SGIR (GICv2) or System Register ICC_SGI1R (GICv3). However, the emulation code does not sanitize the list and will directly access an array without checking whether the array index is within bounds. IMPACT ====== A guest may cause a hypervisor crash, resulting in a Denial of Service (DoS). VULNERABLE SYSTEMS ================== Xen versions 4.6 and onwards are affected. Xen versions 4.5 and earlier are not affected. 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 send sane IPIs (i.e. targeting valid CPUs) 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 Julien Grall of ARM. RESOLUTION ========== Applying the attached patch resolves this issue. xsa225.patch xen-unstable, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x $ sha256sum xsa225* a52d90a2586b74d6dd0d17390c940bf414c1332a6b4ccb87f10b7d97af3b3877 xsa225.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 16436 invoked from network); 20 Jun 2017 12:01:25 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-2.tower-21.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 20 Jun 2017 12:01:25 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNHpJ-0004Es-1g; Tue, 20 Jun 2017 12:00:09 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1dNHpJ-000683-14; Tue, 20 Jun 2017 12:00:09 +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, 20 Jun 2017 12:00:09 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 223 - ARM guest disabling interrupt may crash Xen 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-223 version 2 ARM guest disabling interrupt may crash Xen UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Virtual interrupt injection could be triggered by a guest when sending an SGI (e.g IPI) to any vCPU or by configuring timers. When the virtual interrupt is masked, a missing check in the injection path may result in reading invalid hardware register or crashing the host. IMPACT ====== A guest may cause a hypervisor crash, resulting in a Denial of Service (DoS). VULNERABLE SYSTEMS ================== All Xen versions which support ARM 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 do not disable SGI and PPI (i.e IRQ < 32) 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 Julien Grall of ARM. RESOLUTION ========== Applying the attached patch resolves this issue. xsa223.patch xen-unstable, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x, Xen 4.5.x $ sha256sum xsa223* b5c8d8e8dac027069bec7dd812cff3f6f99e5949dd4a8ee729255c38274958b1 xsa223.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 60281 invoked from network); 20 Jun 2017 12:03:29 -0000 Received: from mail.xenproject.org (HELO mail.xenproject.org) (104.130.215.37) by server-3.tower-206.messagelabs.com with AES128-GCM-SHA256 encrypted SMTP; 20 Jun 2017 12:03:29 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNHsQ-0004OP-Im; Tue, 20 Jun 2017 12:03:22 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1dNHsQ-0007FF-Hf; Tue, 20 Jun 2017 12:03:22 +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: Tue, 20 Jun 2017 12:03:22 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 218 - Races in the grant table unmap 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-218 version 4 Races in the grant table unmap code UPDATES IN VERSION 4 ==================== Adjust last patch description and add review tag. Public release. ISSUE DESCRIPTION ================= We have discovered two bugs in the code unmapping grant references. * When a grant had been mapped twice by a backend domain, and then unmapped by two concurrent unmap calls, the frontend may be informed that the page had no further mappings when the first call completed rather than when the second call completed. * A race triggerable by an unprivileged guest could cause a grant maptrack entry for grants to be "freed" twice. The ultimate effect of this would be for maptrack entries for a single domain to be re-used. IMPACT ====== For the first issue, for a short window of time, a malicious backend could still read and write memory that the frontend thought was its own again. Depending on the usage, this could be either an information leak, or a backend-to-frontend privilege escalation. The second issue is more difficult to analyze. It can probably cause reference counts to leak, preventing memory from being freed on domain destruction (denial-of-service), but information leakage or host privilege escalation cannot be ruled out. VULNERABLE SYSTEMS ================== All versions of Xen are vulnerable. Both ARM and x86 are vulnerable. On x86, systems with either PV or HVM guests are vulnerable. MITIGATION ========== None. CREDITS ======= This issue was discovered by Jann Horn of Google Project Zero. RESOLUTION ========== Applying the appropriate set of attached patches resolves this issue. xsa218-unstable/*.patch xen-unstable xsa218-4.8/*.patch Xen 4.8.x xsa218-4.7/*.patch Xen 4.7.x xsa218-4.6/*.patch Xen 4.6.x xsa218-4.5/*.patch Xen 4.5.x $ sha256sum xsa218*/* 6f5e588edb6d3f0a37b89235e95cdcc7ca73cdff236d86b65e6f608bd15b03ec xsa218-unstable/0001-gnttab-fix-unmap-pin-accounting-race.patch 5cb85f0aaa19ff343fc51b08addbf37d62352774115acd28eb18a73f67507e21 xsa218-unstable/0002-gnttab-Avoid-potential-double-put-of-maptrack-entry.patch f5f3d27ce2829b3aa5e09b216bf9afcb1dc6b1f9f3b3a0f3ebfe5a68b4948aef xsa218-unstable/0003-gnttab-correct-maptrack-table-accesses.patch fafb8773957bbffb21ab43c7a3559efe15f52d234afba5f2ad2739411946c021 xsa218-4.5/0001-IOMMU-handle-IOMMU-mapping-and-unmapping-failures.patch 4398ad7111421dbf954ede651cb7f9acd83c654c7fa93d54a4e5f9b7b25fe918 xsa218-4.5/0002-gnttab-fix-unmap-pin-accounting-race.patch 9d23946afb96a70c574b8c7ff42ed8b30b72e9a1f751ff617a7578c79645c094 xsa218-4.5/0003-gnttab-Avoid-potential-double-put-of-maptrack-entry.patch 27d92c6f4d89de3fd9e9311337823370303c1ef985cce2bd9bea28f00cd6c184 xsa218-4.5/0004-gnttab-correct-maptrack-table-accesses.patch 99ac090d7955a46c6c9c73ca62b64cef6b8f05439961e52278c662f030a36ee2 xsa218-4.6/0001-IOMMU-handle-IOMMU-mapping-and-unmapping-failures.patch e0f0839336e055c1422cf0f76c37f6d9cc8474b0140ffef2451dca6697a9f20f xsa218-4.6/0002-gnttab-fix-unmap-pin-accounting-race.patch 5f6f63211b18bb6ec157353b9e8b844abe3fd767ef1780e6d28731e935559fbc xsa218-4.6/0003-gnttab-Avoid-potential-double-put-of-maptrack-entry.patch 6a786a8c4b916b6f99092598bd4d60381907cd7e728c98a79e999afeec4f45a6 xsa218-4.6/0004-gnttab-correct-maptrack-table-accesses.patch 58354eec5f4f0b87640c702c6e1ce0eeb57dffbd09394a96e88bd6ff42c53e7e xsa218-4.7/0001-IOMMU-handle-IOMMU-mapping-and-unmapping-failures.patch 0683d7ffdbe60dc8e1d161adeb0c5465df1840e86353b5cbb96dd204f2dbb526 xsa218-4.7/0002-gnttab-fix-unmap-pin-accounting-race.patch 6bfef9e1653a305e49653c5b81acb57ca41ee8410ea085d49c9bc7e4ccd31e54 xsa218-4.7/0003-gnttab-Avoid-potential-double-put-of-maptrack-entry.patch b4ede29e3a94d9e7992c90b8b7c8d489e071764218b28962b5755a444040e1ae xsa218-4.7/0004-gnttab-correct-maptrack-table-accesses.patch c2a1b40e76764333f3ee34dd9bc7d3e34bab91f8b44eaae7aa6f187bbddb358f xsa218-4.8/0001-gnttab-fix-unmap-pin-accounting-race.patch a210ff17a0ca1a81f2c98cce84a104ac7dd2f1a72fa3855ca5f3b3d13e95468c xsa218-4.8/0002-gnttab-Avoid-potential-double-put-of-maptrack-entry.patch 0b8fa3d6a0f3ccb43c8134db2240867d5a850ee0821d4124a1642596b4d6cb5a xsa218-4.8/0003-gnttab-correct-maptrack-table-accesses.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 localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNIMy-0007eh-9T; Tue, 20 Jun 2017 12:34:56 +0000 Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNIMw-0007eV-Nj; Tue, 20 Jun 2017 12:34:55 +0000 Received: from [193.109.254.147] by server-9.bemta-6.messagelabs.com id 87/3E-03557-D6619495; Tue, 20 Jun 2017 12:34:53 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprNJsWRWlGSWpSXmKPExsWS0XRdVTdHzDP SYFO/ocWtm63MFks+LmaxWHX1AKsDs8fR3b+ZAhijWDPzkvIrElgzbqxtYS5oOsZUcfbvVNYG xpO7mboYuTiEBI4zSty7voCti5ETyFnEKPF2owmIzSzgKnFj32Y2CFtR4sK9BhYQm1dAUOLkz CdgtoSApsSdN6vYQWwRgSKJnedegtlsAnoSc89OYoLotZSYP/EU2BxhAR+J1+872CHmmEn83D qbGcRmEVCV+LN/D9sERp5ZSFbPQrJ6FpLVsxg5gOKaEut36UOY0hLL/3FAVMtLbH87hxnC9pF YvusCC4TtKbHt/AEWmIlTuh+yw2w6cGovG8QYJ4lXJxUxlbhJzJj6kxmixFliRrc3phJHiZm9 e1khSuwkDn1XxWbR+4UnoWwniZanZ5iwqel/0M4GUzN13nQ2ZDULGCVWMWoUpxaVpRbpGprpJ 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encrypted SMTP; 20 Jun 2017 12:34:52 -0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNIMo-0005G1-JQ; Tue, 20 Jun 2017 12:34:46 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.84_2) (envelope-from ) id 1dNIMo-0003Gy-Ei; Tue, 20 Jun 2017 12:34:46 +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, 20 Jun 2017 12:34:46 +0000 Cc: "Xen.org security team" Subject: [Xen-announce] Xen Security Advisory 216 - blkif responses leak backend stack data 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-216 version 4 blkif responses leak backend stack data UPDATES IN VERSION 4 ==================== Move "For patch:" Reported-by to patches as intended. ISSUE DESCRIPTION ================= The block interface response structure has some discontiguous fields. Certain backends populate the structure fields of an otherwise uninitialized instance of this structure on their stacks, leaking data through the (internal or trailing) padding field. IMPACT ====== A malicious unprivileged guest may be able to obtain sensitive information from the host or other guests. VULNERABLE SYSTEMS ================== All Linux versions supporting the xen-blkback, blkback, or blktap drivers are vulnerable. FreeBSD, NetBSD and Windows (with or without PV drivers) are not vulnerable (either because they do not have backends at all, or because they use a different implementation technique which does not suffer from this problem). All qemu versions supporting the Xen block backend are vulnerable. The qemu-xen-traditional code base does not include such code, so is not vulnerable. Note that an instance of qemu will be spawned to provide the backend for most non-raw-format disks; so you may need to apply the patch to qemu even if you use only PV guests. MITIGATION ========== There's no mitigation available for x86 PV and ARM guests. For x86 HVM guests it may be possible to change the guest configuaration such that a fully virtualized disk is being made available instead. However, this would normally entail changes inside the guest itself. CREDITS ======= This issue was discovered by Anthony Perard of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa216-linux-4.11.patch Linux 4.5 ... 4.11 xsa216-linux-4.4.patch Linux 3.3 ... 4.4 xsa216-qemuu.patch qemu-upstream master, 4.8 xsa216-qemuu-4.7.patch qemu-upstream 4.7, 4.6 xsa216-qemuu-4.5.patch qemu-upstream 4.5 xsa216-linux-2.6.18-xen.patch linux-2.6.18-xen.hg $ sha256sum xsa216* d316e16f8da2078966e9d7d516dd0a9ed5a29c3bc479974374c8fa778859913d xsa216-linux-2.6.18-xen.patch 4440fe324b61baf0f3f5a73352c4d9ac6f94917e216d8421263a5e67445852db xsa216-linux-4.4.patch eb24bfc0303e13e08fd3710463aea139a92a3f83db7f35119c4d3831154a6453 xsa216-linux-4.11.patch b4b8f68fa05d718c5be7023c84d942e43725bcc563ea15556ee9646f6f9bf7e7 xsa216-qemuu.patch 4fc3665ff07ec79fb31ac66a3fd360a45b7ec546c549c04284f0128ad0c5beba xsa216-qemuu-4.5.patch a0e0dfd5ea2643ae14c220124194388017a3656db3e6ce430913cda800c43aad xsa216-qemuu-4.7.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. However, deployment of the mitigation is NOT permitted (except where all the affected systems and VMs are administered and used only by organisations which are members of the Xen Project Security Issues Predisclosure List). Specifically, deployment on public cloud systems is NOT permitted. This is because this produces a guest-visible change which will indicate which component contains the vulnerability. Additionally, 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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SMTP; 22 Jun 2017 17:42:52 -0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8D91B80D; Thu, 22 Jun 2017 10:42:51 -0700 (PDT) Received: from [10.1.206.53] (e108454-lin.cambridge.arm.com [10.1.206.53]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id CDC733F557; Thu, 22 Jun 2017 10:42:50 -0700 (PDT) To: xen-devel , xen-announce@lists.xenproject.org, "xen-users@lists.xen.org" From: Julien Grall Message-ID: <0662601d-a77b-7d52-4be0-bcb76bea3b12@arm.com> Date: Thu, 22 Jun 2017 18:42:49 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 X-Mailman-Approved-At: Thu, 22 Jun 2017 17:44:21 +0000 Cc: "lars.kurth@citrix.com" Subject: [Xen-announce] Xen 4.9 rc9 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: , 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