Upstream information

CVE-2020-25602 at MITRE

Description

An issue was discovered in Xen through 4.14.x. An x86 PV guest can trigger a host OS crash when handling guest access to MSR_MISC_ENABLE. When a guest accesses certain Model Specific Registers, Xen first reads the value from hardware to use as the basis for auditing the guest access. For the MISC_ENABLE MSR, which is an Intel specific MSR, this MSR read is performed without error handling for a #GP fault, which is the consequence of trying to read this MSR on non-Intel hardware. A buggy or malicious PV guest administrator can crash Xen, resulting in a host Denial of Service. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only Xen versions 4.11 and onwards are vulnerable. 4.10 and earlier are not vulnerable. Only x86 systems that do not implement the MISC_ENABLE MSR (0x1a0) are vulnerable. AMD and Hygon systems do not implement this MSR and are vulnerable. Intel systems do implement this MSR and are not vulnerable. Other manufacturers have not been checked. Only x86 PV guests can exploit the vulnerability. x86 HVM/PVH guests cannot exploit the vulnerability.

SUSE information

Overall state of this security issue: Running

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 4.6
Vector AV:L/AC:L/Au:S/C:N/I:N/A:C
Access Vector Local
Access Complexity Low
Authentication Single
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 6 6.2
Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Access Vector Local Local
Access Complexity Low Low
Privileges Required High None
User Interaction None None
Scope Changed Unchanged
Confidentiality Impact None None
Integrity Impact None None
Availability Impact High High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1176339 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
Image SLES15-SP1-CHOST-BYOS-EC2
  • xen-libs >= 4.12.3_08-3.28.1
  • xen-tools-domU >= 4.12.3_08-3.28.1
Image SLES15-SP2-CHOST-BYOS-Ali
Image SLES15-SP2-CHOST-BYOS-Azure
Image SLES15-SP2-CHOST-BYOS-GCE
Image SLES15-SP2-CHOST-BYOS-OpenStack
  • xen-libs >= 4.13.1_08-3.10.1
Image SLES15-SP2-CHOST-BYOS-EC2
  • xen-libs >= 4.13.1_08-3.10.1
  • xen-tools-domU >= 4.13.1_08-3.10.1
SUSE Linux Enterprise Module for Basesystem 15 SP1
  • xen >= 4.12.3_08-3.28.1
  • xen-libs >= 4.12.3_08-3.28.1
  • xen-tools-domU >= 4.12.3_08-3.28.1
Patchnames:
SUSE-SLE-Module-Basesystem-15-SP1-2020-2790
SUSE Linux Enterprise Module for Basesystem 15 SP2
  • xen >= 4.13.1_08-3.10.1
  • xen-libs >= 4.13.1_08-3.10.1
  • xen-tools-domU >= 4.13.1_08-3.10.1
Patchnames:
SUSE-SLE-Module-Basesystem-15-SP2-2020-2791
SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 SP1
  • xen >= 4.12.3_08-3.28.1
  • xen-devel >= 4.12.3_08-3.28.1
  • xen-doc-html >= 4.12.3_08-3.28.1
  • xen-libs >= 4.12.3_08-3.28.1
  • xen-libs-32bit >= 4.12.3_08-3.28.1
  • xen-tools >= 4.12.3_08-3.28.1
  • xen-tools-domU >= 4.12.3_08-3.28.1
Patchnames:
SUSE-SLE-Module-Development-Tools-OBS-15-SP1-2020-2790
SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 SP2
  • xen >= 4.13.1_08-3.10.1
  • xen-devel >= 4.13.1_08-3.10.1
  • xen-doc-html >= 4.13.1_08-3.10.1
  • xen-libs >= 4.13.1_08-3.10.1
  • xen-libs-32bit >= 4.13.1_08-3.10.1
  • xen-tools >= 4.13.1_08-3.10.1
  • xen-tools-domU >= 4.13.1_08-3.10.1
Patchnames:
SUSE-SLE-Module-Development-Tools-OBS-15-SP2-2020-2791
SUSE Linux Enterprise Module for Server Applications 15 SP1
  • xen >= 4.12.3_08-3.28.1
  • xen-devel >= 4.12.3_08-3.28.1
  • xen-tools >= 4.12.3_08-3.28.1
Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP1-2020-2790
SUSE Linux Enterprise Module for Server Applications 15 SP2
  • xen >= 4.13.1_08-3.10.1
  • xen-devel >= 4.13.1_08-3.10.1
  • xen-tools >= 4.13.1_08-3.10.1
  • xen-tools-xendomains-wait-disk >= 4.13.1_08-3.10.1
Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP2-2020-2791
SUSE Linux Enterprise Server 12 SP4-ESPOS
SUSE Linux Enterprise Server for SAP Applications 12 SP4-ESPOS
  • xen >= 4.11.4_08-2.36.1
  • xen-doc-html >= 4.11.4_08-2.36.1
  • xen-libs >= 4.11.4_08-2.36.1
  • xen-libs-32bit >= 4.11.4_08-2.36.1
  • xen-tools >= 4.11.4_08-2.36.1
  • xen-tools-domU >= 4.11.4_08-2.36.1
Patchnames:
SUSE-SLE-SERVER-12-SP4-ESPOS-2020-2786
SUSE Linux Enterprise Server 12 SP4-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP4-LTSS
  • xen >= 4.11.4_08-2.36.1
  • xen-doc-html >= 4.11.4_08-2.36.1
  • xen-libs >= 4.11.4_08-2.36.1
  • xen-libs-32bit >= 4.11.4_08-2.36.1
  • xen-tools >= 4.11.4_08-2.36.1
  • xen-tools-domU >= 4.11.4_08-2.36.1
Patchnames:
SUSE-SLE-SERVER-12-SP4-LTSS-2020-2786
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 12 SP5
  • xen >= 4.12.3_08-3.24.1
  • xen-doc-html >= 4.12.3_08-3.24.1
  • xen-libs >= 4.12.3_08-3.24.1
  • xen-libs-32bit >= 4.12.3_08-3.24.1
  • xen-tools >= 4.12.3_08-3.24.1
  • xen-tools-domU >= 4.12.3_08-3.24.1
Patchnames:
SUSE-SLE-SERVER-12-SP5-2020-2788
SUSE Linux Enterprise Server for SAP Applications 12 SP4
  • xen >= 4.11.4_08-2.36.1
  • xen-doc-html >= 4.11.4_08-2.36.1
  • xen-libs >= 4.11.4_08-2.36.1
  • xen-libs-32bit >= 4.11.4_08-2.36.1
  • xen-tools >= 4.11.4_08-2.36.1
  • xen-tools-domU >= 4.11.4_08-2.36.1
Patchnames:
SUSE-SLE-SAP-12-SP4-2020-2786
SUSE Linux Enterprise Software Development Kit 12 SP5
  • xen >= 4.12.3_08-3.24.1
  • xen-devel >= 4.12.3_08-3.24.1
Patchnames:
SUSE-SLE-SDK-12-SP5-2020-2788
SUSE OpenStack Cloud 9
  • xen >= 4.11.4_08-2.36.1
  • xen-doc-html >= 4.11.4_08-2.36.1
  • xen-libs >= 4.11.4_08-2.36.1
  • xen-libs-32bit >= 4.11.4_08-2.36.1
  • xen-tools >= 4.11.4_08-2.36.1
  • xen-tools-domU >= 4.11.4_08-2.36.1
Patchnames:
SUSE-OpenStack-Cloud-9-2020-2786
SUSE OpenStack Cloud Crowbar 9
  • xen >= 4.11.4_08-2.36.1
  • xen-doc-html >= 4.11.4_08-2.36.1
  • xen-libs >= 4.11.4_08-2.36.1
  • xen-libs-32bit >= 4.11.4_08-2.36.1
  • xen-tools >= 4.11.4_08-2.36.1
  • xen-tools-domU >= 4.11.4_08-2.36.1
Patchnames:
SUSE-OpenStack-Cloud-Crowbar-9-2020-2786
openSUSE Leap 15.2
  • xen >= 4.13.1_08-lp152.2.9.1
  • xen-debugsource >= 4.13.1_08-lp152.2.9.1
  • xen-devel >= 4.13.1_08-lp152.2.9.1
  • xen-doc-html >= 4.13.1_08-lp152.2.9.1
  • xen-libs >= 4.13.1_08-lp152.2.9.1
  • xen-libs-32bit >= 4.13.1_08-lp152.2.9.1
  • xen-libs-32bit-debuginfo >= 4.13.1_08-lp152.2.9.1
  • xen-libs-debuginfo >= 4.13.1_08-lp152.2.9.1
  • xen-tools >= 4.13.1_08-lp152.2.9.1
  • xen-tools-debuginfo >= 4.13.1_08-lp152.2.9.1
  • xen-tools-domU >= 4.13.1_08-lp152.2.9.1
  • xen-tools-domU-debuginfo >= 4.13.1_08-lp152.2.9.1
  • xen-tools-xendomains-wait-disk >= 4.13.1_08-lp152.2.9.1
Patchnames:
openSUSE-2020-1608


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
SUSE CaaS Platform 3.0 xen Not affected
SUSE Container as a Service Platform 1.0 xen Not affected
SUSE Container as a Service Platform 2.0 xen Not affected
SUSE Linux Enterprise 15-SP1 Module for Basesystem xen Released
SUSE Linux Enterprise 15-SP1 Module for Server Applications xen Released
SUSE Linux Enterprise 15-SP2 Module for Basesystem xen Released
SUSE Linux Enterprise 15-SP2 Module for Server Applications xen Released
SUSE Linux Enterprise High Performance Computing 12 SP4 xen Affected
SUSE Linux Enterprise High Performance Computing 12 SP5 xen Released
SUSE Linux Enterprise High Performance Computing 15 LTSS xen Affected
SUSE Linux Enterprise Server 11 SP4 LTSS xen Not affected
SUSE Linux Enterprise Server 12 SP2 BCL xen Not affected
SUSE Linux Enterprise Server 12 SP2 LTSS xen Not affected
SUSE Linux Enterprise Server 12 SP3 BCL xen Not affected
SUSE Linux Enterprise Server 12 SP3 LTSS xen Not affected
SUSE Linux Enterprise Server 12 SP4 LTSS xen Affected
SUSE Linux Enterprise Server 12 SP5 xen Released
SUSE Linux Enterprise Server ESPOS 15 xen Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP2 xen Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 xen Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 xen Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 xen Released
SUSE Linux Enterprise Software Development Kit 12 SP5 xen Affected