Upstream information

CVE-2020-25600 at MITRE

Description

An issue was discovered in Xen through 4.14.x. Out of bounds event channels are available to 32-bit x86 domains. The so called 2-level event channel model imposes different limits on the number of usable event channels for 32-bit x86 domains vs 64-bit or Arm (either bitness) ones. 32-bit x86 domains can use only 1023 channels, due to limited space in their shared (between guest and Xen) information structure, whereas all other domains can use up to 4095 in this model. The recording of the respective limit during domain initialization, however, has occurred at a time where domains are still deemed to be 64-bit ones, prior to actually honoring respective domain properties. At the point domains get recognized as 32-bit ones, the limit didn't get updated accordingly. Due to this misbehavior in Xen, 32-bit domains (including Domain 0) servicing other domains may observe event channel allocations to succeed when they should really fail. Subsequent use of such event channels would then possibly lead to corruption of other parts of the shared info structure. An unprivileged guest may cause another domain, in particular Domain 0, to misbehave. This may lead to a Denial of Service (DoS) for the entire system. All Xen versions from 4.4 onwards are vulnerable. Xen versions 4.3 and earlier are not vulnerable. Only x86 32-bit domains servicing other domains are vulnerable. Arm systems, as well as x86 64-bit domains, are not vulnerable.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having important severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 4.9
Vector AV:L/AC:L/Au:N/C:N/I:N/A:C
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 5.5 7.1
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Access Vector Local Local
Access Complexity Low Low
Privileges Required Low None
User Interaction None None
Scope Unchanged Changed
Confidentiality Impact None None
Integrity Impact None None
Availability Impact High High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1176348 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
HPE Helion Openstack 8
  • xen >= 4.9.4_12-3.74.1
  • xen-doc-html >= 4.9.4_12-3.74.1
  • xen-libs >= 4.9.4_12-3.74.1
  • xen-libs-32bit >= 4.9.4_12-3.74.1
  • xen-tools >= 4.9.4_12-3.74.1
  • xen-tools-domU >= 4.9.4_12-3.74.1
Patchnames:
HPE-Helion-OpenStack-8-2020-2787
Image SLES15-EC2-CHOST-HVM-BYOS
  • xen-libs >= 4.10.4_16-3.41.1
  • xen-tools-domU >= 4.10.4_16-3.41.1
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 Enterprise Storage 5
  • xen >= 4.9.4_12-3.74.1
  • xen-doc-html >= 4.9.4_12-3.74.1
  • xen-libs >= 4.9.4_12-3.74.1
  • xen-libs-32bit >= 4.9.4_12-3.74.1
  • xen-tools >= 4.9.4_12-3.74.1
  • xen-tools-domU >= 4.9.4_12-3.74.1
Patchnames:
SUSE-Storage-5-2020-2787
SUSE Linux Enterprise High Performance Computing 15-ESPOS
SUSE Linux Enterprise High Performance Computing 15-LTSS
  • xen >= 4.10.4_16-3.41.1
  • xen-devel >= 4.10.4_16-3.41.1
  • xen-libs >= 4.10.4_16-3.41.1
  • xen-tools >= 4.10.4_16-3.41.1
  • xen-tools-domU >= 4.10.4_16-3.41.1
Patchnames:
SUSE-SLE-Product-HPC-15-2020-2789
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 Point of Sale 12 SP2-CLIENT
  • xen >= 4.7.6_10-43.67.1
  • xen-doc-html >= 4.7.6_10-43.67.1
  • xen-libs >= 4.7.6_10-43.67.1
  • xen-libs-32bit >= 4.7.6_10-43.67.1
  • xen-tools >= 4.7.6_10-43.67.1
  • xen-tools-domU >= 4.7.6_10-43.67.1
Patchnames:
SUSE-SLE-POS-12-SP2-CLIENT-2020-2822
SUSE Linux Enterprise Server 11 SP4-LTSS
SUSE Linux Enterprise Server for SAP Applications 11 SP4-LTSS
  • xen >= 4.4.4_44-61.55.1
  • xen-doc-html >= 4.4.4_44-61.55.1
  • xen-kmp-default >= 4.4.4_44_3.0.101_108.117-61.55.1
  • xen-kmp-pae >= 4.4.4_44_3.0.101_108.117-61.55.1
  • xen-libs >= 4.4.4_44-61.55.1
  • xen-libs-32bit >= 4.4.4_44-61.55.1
  • xen-tools >= 4.4.4_44-61.55.1
  • xen-tools-domU >= 4.4.4_44-61.55.1
Patchnames:
slessp4-xen-14521
SUSE Linux Enterprise Server 12 SP2-BCL
SUSE Linux Enterprise Server for SAP Applications 12 SP2-BCL
  • xen >= 4.7.6_10-43.67.1
  • xen-doc-html >= 4.7.6_10-43.67.1
  • xen-libs >= 4.7.6_10-43.67.1
  • xen-libs-32bit >= 4.7.6_10-43.67.1
  • xen-tools >= 4.7.6_10-43.67.1
  • xen-tools-domU >= 4.7.6_10-43.67.1
Patchnames:
SUSE-SLE-SERVER-12-SP2-BCL-2020-2822
SUSE Linux Enterprise Server 12 SP2-ESPOS
SUSE Linux Enterprise Server for SAP Applications 12 SP2-ESPOS
  • xen >= 4.7.6_10-43.67.1
  • xen-doc-html >= 4.7.6_10-43.67.1
  • xen-libs >= 4.7.6_10-43.67.1
  • xen-libs-32bit >= 4.7.6_10-43.67.1
  • xen-tools >= 4.7.6_10-43.67.1
  • xen-tools-domU >= 4.7.6_10-43.67.1
Patchnames:
SUSE-SLE-SERVER-12-SP2-ESPOS-2020-2822
SUSE Linux Enterprise Server 12 SP2-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP2-LTSS
  • xen >= 4.7.6_10-43.67.1
  • xen-doc-html >= 4.7.6_10-43.67.1
  • xen-libs >= 4.7.6_10-43.67.1
  • xen-libs-32bit >= 4.7.6_10-43.67.1
  • xen-tools >= 4.7.6_10-43.67.1
  • xen-tools-domU >= 4.7.6_10-43.67.1
Patchnames:
SUSE-SLE-SERVER-12-SP2-2020-2822
SUSE Linux Enterprise Server 12 SP3-BCL
SUSE Linux Enterprise Server for SAP Applications 12 SP3-BCL
  • xen >= 4.9.4_12-3.74.1
  • xen-doc-html >= 4.9.4_12-3.74.1
  • xen-libs >= 4.9.4_12-3.74.1
  • xen-libs-32bit >= 4.9.4_12-3.74.1
  • xen-tools >= 4.9.4_12-3.74.1
  • xen-tools-domU >= 4.9.4_12-3.74.1
Patchnames:
SUSE-SLE-SERVER-12-SP3-BCL-2020-2787
SUSE Linux Enterprise Server 12 SP3-ESPOS
SUSE Linux Enterprise Server for SAP Applications 12 SP3-ESPOS
  • xen >= 4.9.4_12-3.74.1
  • xen-doc-html >= 4.9.4_12-3.74.1
  • xen-libs >= 4.9.4_12-3.74.1
  • xen-libs-32bit >= 4.9.4_12-3.74.1
  • xen-tools >= 4.9.4_12-3.74.1
  • xen-tools-domU >= 4.9.4_12-3.74.1
Patchnames:
SUSE-SLE-SERVER-12-SP3-ESPOS-2020-2787
SUSE Linux Enterprise Server 12 SP3-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP3-LTSS
  • xen >= 4.9.4_12-3.74.1
  • xen-doc-html >= 4.9.4_12-3.74.1
  • xen-libs >= 4.9.4_12-3.74.1
  • xen-libs-32bit >= 4.9.4_12-3.74.1
  • xen-tools >= 4.9.4_12-3.74.1
  • xen-tools-domU >= 4.9.4_12-3.74.1
Patchnames:
SUSE-SLE-SERVER-12-SP3-2020-2787
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 15-LTSS
  • xen >= 4.10.4_16-3.41.1
  • xen-devel >= 4.10.4_16-3.41.1
  • xen-libs >= 4.10.4_16-3.41.1
  • xen-tools >= 4.10.4_16-3.41.1
  • xen-tools-domU >= 4.10.4_16-3.41.1
Patchnames:
SUSE-SLE-Product-SLES-15-2020-2789
SUSE Linux Enterprise Server for SAP Applications 12 SP2
  • xen >= 4.7.6_10-43.67.1
  • xen-doc-html >= 4.7.6_10-43.67.1
  • xen-libs >= 4.7.6_10-43.67.1
  • xen-libs-32bit >= 4.7.6_10-43.67.1
  • xen-tools >= 4.7.6_10-43.67.1
  • xen-tools-domU >= 4.7.6_10-43.67.1
Patchnames:
SUSE-SLE-SAP-12-SP2-2020-2822
SUSE Linux Enterprise Server for SAP Applications 12 SP3
  • xen >= 4.9.4_12-3.74.1
  • xen-doc-html >= 4.9.4_12-3.74.1
  • xen-libs >= 4.9.4_12-3.74.1
  • xen-libs-32bit >= 4.9.4_12-3.74.1
  • xen-tools >= 4.9.4_12-3.74.1
  • xen-tools-domU >= 4.9.4_12-3.74.1
Patchnames:
SUSE-SLE-SAP-12-SP3-2020-2787
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 Server for SAP Applications 15
  • xen >= 4.10.4_16-3.41.1
  • xen-devel >= 4.10.4_16-3.41.1
  • xen-libs >= 4.10.4_16-3.41.1
  • xen-tools >= 4.10.4_16-3.41.1
  • xen-tools-domU >= 4.10.4_16-3.41.1
Patchnames:
SUSE-SLE-Product-SLES_SAP-15-2020-2789
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 7
  • xen >= 4.7.6_10-43.67.1
  • xen-doc-html >= 4.7.6_10-43.67.1
  • xen-libs >= 4.7.6_10-43.67.1
  • xen-libs-32bit >= 4.7.6_10-43.67.1
  • xen-tools >= 4.7.6_10-43.67.1
  • xen-tools-domU >= 4.7.6_10-43.67.1
Patchnames:
SUSE-OpenStack-Cloud-7-2020-2822
SUSE OpenStack Cloud 8
  • xen >= 4.9.4_12-3.74.1
  • xen-doc-html >= 4.9.4_12-3.74.1
  • xen-libs >= 4.9.4_12-3.74.1
  • xen-libs-32bit >= 4.9.4_12-3.74.1
  • xen-tools >= 4.9.4_12-3.74.1
  • xen-tools-domU >= 4.9.4_12-3.74.1
Patchnames:
SUSE-OpenStack-Cloud-8-2020-2787
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 8
  • xen >= 4.9.4_12-3.74.1
  • xen-doc-html >= 4.9.4_12-3.74.1
  • xen-libs >= 4.9.4_12-3.74.1
  • xen-libs-32bit >= 4.9.4_12-3.74.1
  • xen-tools >= 4.9.4_12-3.74.1
  • xen-tools-domU >= 4.9.4_12-3.74.1
Patchnames:
SUSE-OpenStack-Cloud-Crowbar-8-2020-2787
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 Affected
SUSE Container as a Service Platform 1.0 xen Affected
SUSE Container as a Service Platform 2.0 xen 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 Affected
SUSE Linux Enterprise Server 12 SP2 BCL xen Affected
SUSE Linux Enterprise Server 12 SP2 LTSS xen Affected
SUSE Linux Enterprise Server 12 SP3 BCL xen Affected
SUSE Linux Enterprise Server 12 SP3 LTSS xen 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 Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 xen 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