Bugzilla – Bug 1186428
VUL-0: CVE-2021-28693: xen: xen/arm: Boot modules are not scrubbed (XSA-372)
Last modified: 2023-12-15 18:10:10 UTC
Xen Security Advisory CVE-2021-28693 / XSA-372 version 3 xen/arm: Boot modules are not scrubbed UPDATES IN VERSION 3 ==================== Public release. ISSUE DESCRIPTION ================= The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must "scrub" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm. IMPACT ====== Sensitive information from the boot modules might be visible to another domain after boot. VULNERABLE SYSTEMS ================== Only Arm systems are vulnerable. System running with "bootscrub=off" (disabling boot scrubbing) are not vulnerable. All versions of Xen since 4.12 are vulnerable. MITIGATION ========== There is no mitigation available. CREDITS ======= This issue was discovered by Julien Grall of Amazon. RESOLUTION ========== Applying the appropriate set of attached patches resolves this issue. Note that patches for released versions are generally prepared to apply to the stable branches, and may not apply cleanly to the most recent release tarball. Downstreams are encouraged to update to the tip of the stable branch before applying these patches. xsa372/*.patch xen-unstable xsa372-4.15/*.patch Xen 4.15.x xsa372-4.14/*.patch Xen 4.14.x - Xen 4.13.x xsa372-4.12/*.patch Xen 4.12.x $ sha256sum xsa372* xsa372*/* 06e43684c2d8a3085d55b8b40f57e1b9f1ee47519fac844dcbc21b57fb039915 xsa372.meta 8f872c7abe6c795dbef2e401f2223fda0dbb9d7c57dfebd8047eef37e1caf952 xsa372-4.12/0001-xen-arm-Create-dom0less-domUs-earlier.patch a43c6c11481cc3f13900908cee79cc6c5401921f6f4e8858c0796cf301cfe923 xsa372-4.12/0002-xen-arm-Boot-modules-should-always-be-scrubbed-if-bo.patch 6d1fad53795ebd251520022b6be901215426ba78ccbbc075841698973b74d2a2 xsa372-4.14/0001-xen-arm-Create-dom0less-domUs-earlier.patch 2ceb5d4d8d4f8a18046721daa3bb29633a620c4794b54e1265f5d4d69a314c3b xsa372-4.14/0002-xen-arm-Boot-modules-should-always-be-scrubbed-if-bo.patch 7feae5f9f7f2df0ec38c0b9358dc32671a9955f966b3120e17bb3fd820ce33ff xsa372-4.15/0001-xen-arm-Create-dom0less-domUs-earlier.patch 0cc73b4751fa49f68c6584b1c7882606c6e1f18561d8a6547017ab068de4eb4b xsa372-4.15/0002-xen-arm-Boot-modules-should-always-be-scrubbed-if-bo.patch 950672405c695ebf6ae59eebeb454bc0738b7afc3efa35ef9680d76eef4d4ec0 xsa372/0001-xen-arm-Create-dom0less-domUs-earlier.patch 9ceccd39c795e7756052a2f00256e043c8dda42e2c691df30e3f8b59190d6e8e xsa372/0002-xen-arm-Boot-modules-should-always-be-scrubbed-if-bo.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
# maintenance_jira_update_notice SUSE-SU-2021:2923-1: An update that solves 11 vulnerabilities and has 7 fixes is now available. Category: security (important) Bug References: 1027519,1176189,1179246,1183243,1183877,1185682,1186428,1186429,1186433,1186434,1187406,1188050,1189373,1189376,1189378,1189380,1189381,1189882 CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700 JIRA References: Sources used: SUSE Linux Enterprise Module for Server Applications 15-SP3 (src): xen-4.14.2_04-3.9.1 SUSE Linux Enterprise Module for Basesystem 15-SP3 (src): xen-4.14.2_04-3.9.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
# maintenance_jira_update_notice SUSE-SU-2021:2922-1: An update that solves 11 vulnerabilities and has 9 fixes is now available. Category: security (important) Bug References: 1027519,1137251,1176189,1179148,1179246,1180491,1181989,1183877,1185682,1186428,1186429,1186433,1186434,1188050,1189373,1189376,1189378,1189380,1189381,1189882 CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700 JIRA References: Sources used: SUSE MicroOS 5.0 (src): xen-4.13.3_02-3.34.1 SUSE Linux Enterprise Module for Server Applications 15-SP2 (src): xen-4.13.3_02-3.34.1 SUSE Linux Enterprise Module for Basesystem 15-SP2 (src): xen-4.13.3_02-3.34.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
# maintenance_jira_update_notice SUSE-SU-2021:2924-1: An update that solves 15 vulnerabilities and has 6 fixes is now available. Category: security (important) Bug References: 1027519,1179246,1180491,1180846,1182654,1183243,1185682,1186428,1186429,1186433,1186434,1187369,1187376,1187378,1188050,1189373,1189376,1189378,1189380,1189381,1189882 CVE References: CVE-2021-0089,CVE-2021-20255,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700,CVE-2021-3592,CVE-2021-3594,CVE-2021-3595 JIRA References: Sources used: SUSE Linux Enterprise Software Development Kit 12-SP5 (src): xen-4.12.4_12-3.49.1 SUSE Linux Enterprise Server 12-SP5 (src): xen-4.12.4_12-3.49.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
# maintenance_jira_update_notice openSUSE-SU-2021:2923-1: An update that solves 11 vulnerabilities and has 7 fixes is now available. Category: security (important) Bug References: 1027519,1176189,1179246,1183243,1183877,1185682,1186428,1186429,1186433,1186434,1187406,1188050,1189373,1189376,1189378,1189380,1189381,1189882 CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700 JIRA References: Sources used: openSUSE Leap 15.3 (src): xen-4.14.2_04-3.9.1
# maintenance_jira_update_notice SUSE-SU-2021:2925-1: An update that solves 11 vulnerabilities and has 7 fixes is now available. Category: security (important) Bug References: 1027519,1179148,1179246,1180491,1180846,1181989,1183243,1186428,1186429,1186433,1186434,1188050,1189373,1189376,1189378,1189380,1189381,1189882 CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700 JIRA References: Sources used: SUSE Manager Server 4.0 (src): xen-4.12.4_12-3.52.1 SUSE Manager Retail Branch Server 4.0 (src): xen-4.12.4_12-3.52.1 SUSE Manager Proxy 4.0 (src): xen-4.12.4_12-3.52.1 SUSE Linux Enterprise Server for SAP 15-SP1 (src): xen-4.12.4_12-3.52.1 SUSE Linux Enterprise Server 15-SP1-LTSS (src): xen-4.12.4_12-3.52.1 SUSE Linux Enterprise Server 15-SP1-BCL (src): xen-4.12.4_12-3.52.1 SUSE Linux Enterprise High Performance Computing 15-SP1-LTSS (src): xen-4.12.4_12-3.52.1 SUSE Linux Enterprise High Performance Computing 15-SP1-ESPOS (src): xen-4.12.4_12-3.52.1 SUSE Enterprise Storage 6 (src): xen-4.12.4_12-3.52.1 SUSE CaaS Platform 4.0 (src): xen-4.12.4_12-3.52.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
# maintenance_jira_update_notice openSUSE-SU-2021:1236-1: An update that solves 11 vulnerabilities and has 9 fixes is now available. Category: security (important) Bug References: 1027519,1137251,1176189,1179148,1179246,1180491,1181989,1183877,1185682,1186428,1186429,1186433,1186434,1188050,1189373,1189376,1189378,1189380,1189381,1189882 CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700 JIRA References: Sources used: openSUSE Leap 15.2 (src): xen-4.13.3_02-lp152.2.27.1
ARM is actually not supported with Xen but we do take the patches for the convenience of backporting later fixes. Xen 4.12 (SLE12-SP5/SLE15-SP1 ->) and newer