Bugzilla – Bug 1181254
VUL-0: CVE-2021-3308: xen: IRQ vector leak on x86 (XSA-360)
Last modified: 2022-06-10 10:07:18 UTC
Xen Security Advisory XSA-360 IRQ vector leak on x86 ISSUE DESCRIPTION ================= A x86 HVM guest with PCI pass through devices can force the allocation of all IDT vectors on the system by rebooting itself with MSI or MSI-X capabilities enabled and entries setup. Such reboots will leak any vectors used by the MSI(-X) entries that the guest might had enabled, and hence will lead to vector exhaustion on the system, not allowing further PCI pass through devices to work properly. IMPACT ====== HVM guests with PCI pass through devices can mount a Denial of Service (DoS) attack affecting the pass through of PCI devices to other guests or the hardware domain. In the latter case this would affect the entire host. VULNERABLE SYSTEMS ================== Xen versions 4.12.3, 4.12.4, and all versions from 4.13.1 onwards are vulnerable. Xen version 4.13.0 and all versions up to 4.12.2 are not affected. Only x86 systems running HVM guests with PCI pass through devices are vulnerable. MITIGATION ========== Not running HVM guests with PCI pass through devices will avoid the vulnerability. Note that even non-malicious guests can trigger this vulnerability as part of normal operation. RESOLUTION ========== Applying the appropriate attached patch 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. xsa360.patch xen-unstable xsa360-4.14.patch Xen 4.14 - 4.12 $ sha256sum xsa360* c874ad2b9edb0791ac975735306d055b1916f4acbc59e6f1550fbf33223d6106 xsa360.meta 592f3afda63777d31844e0e34d85fbe387a62d59fa7903ee19b22a98fba68894 xsa360.patch 809515011efb781a2a8742e9acfd76412d3920c2d4142bb187588cd36f77383e xsa360-4.14.patch $ CREDITS ======= This issue was discovered by James McCoy, debugged in combination with Samuel Verschelde of Vates, and recognised as a security issue by Roger Pau Monné of Citrix. NOTE REGARDING LACK OF EMBARGO ============================== This was reported and debugged publicly, before the security implications were apparent.
Created attachment 845405 [details] patches
This is an autogenerated message for OBS integration: This bug (1181254) was mentioned in https://build.opensuse.org/request/show/866148 Factory / xen
Tracked SLE12-SP5, SLE15-SP1 and SLE15-SP2 as affected.
SUSE-SU-2021:1023-1: An update that solves four vulnerabilities and has 6 fixes is now available. Category: security (important) Bug References: 1027519,1177112,1177204,1178591,1178736,1179148,1181254,1181989,1182846,1183072 CVE References: CVE-2020-28368,CVE-2021-20257,CVE-2021-28687,CVE-2021-3308 JIRA References: Sources used: SUSE Linux Enterprise Software Development Kit 12-SP5 (src): xen-4.12.4_09-3.39.3 SUSE Linux Enterprise Server 12-SP5 (src): xen-4.12.4_09-3.39.3 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.
SUSE-SU-2021:1028-1: An update that solves two vulnerabilities and has 6 fixes is now available. Category: security (important) Bug References: 1027519,1177204,1179148,1180690,1181254,1181989,1182576,1183072 CVE References: CVE-2021-28687,CVE-2021-3308 JIRA References: Sources used: SUSE MicroOS 5.0 (src): xen-4.13.2_08-3.25.3 SUSE Linux Enterprise Module for Server Applications 15-SP2 (src): xen-4.13.2_08-3.25.3 SUSE Linux Enterprise Module for Basesystem 15-SP2 (src): xen-4.13.2_08-3.25.3 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.
This has been released on SLE12-SP5, SLE15-SP2, submitted on SLE15-SP1 (238146), and is part SLE15-SP3 for FCS.
SUSE-SU-2021:1460-1: An update that solves three vulnerabilities and has four fixes is now available. Category: security (important) Bug References: 1027519,1177204,1178591,1179148,1181254,1181989,1183072 CVE References: CVE-2020-28368,CVE-2021-28687,CVE-2021-3308 JIRA References: Sources used: SUSE Manager Server 4.0 (src): xen-4.12.4_08-3.43.3 SUSE Manager Retail Branch Server 4.0 (src): xen-4.12.4_08-3.43.3 SUSE Manager Proxy 4.0 (src): xen-4.12.4_08-3.43.3 SUSE Linux Enterprise Server for SAP 15-SP1 (src): xen-4.12.4_08-3.43.3 SUSE Linux Enterprise Server 15-SP1-LTSS (src): xen-4.12.4_08-3.43.3 SUSE Linux Enterprise Server 15-SP1-BCL (src): xen-4.12.4_08-3.43.3 SUSE Linux Enterprise High Performance Computing 15-SP1-LTSS (src): xen-4.12.4_08-3.43.3 SUSE Linux Enterprise High Performance Computing 15-SP1-ESPOS (src): xen-4.12.4_08-3.43.3 SUSE Enterprise Storage 6 (src): xen-4.12.4_08-3.43.3 SUSE CaaS Platform 4.0 (src): xen-4.12.4_08-3.43.3 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-2021:2955-1: An update that fixes 14 vulnerabilities is now available. Category: security (important) Bug References: 1181254,1182654,1186429,1186433,1186434,1187369,1187376,1187378,1189373,1189376,1189378,1189380,1189882 CVE References: CVE-2021-0089,CVE-2021-20255,CVE-2021-28690,CVE-2021-28692,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-3308,CVE-2021-3592,CVE-2021-3594,CVE-2021-3595 JIRA References: Sources used: SUSE OpenStack Cloud Crowbar 9 (src): xen-4.11.4_20-2.60.1 SUSE OpenStack Cloud 9 (src): xen-4.11.4_20-2.60.1 SUSE Linux Enterprise Server for SAP 12-SP4 (src): xen-4.11.4_20-2.60.1 SUSE Linux Enterprise Server 12-SP4-LTSS (src): xen-4.11.4_20-2.60.1 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.
Done, closing.