Upstream information

CVE-2021-28703 at MITRE

Description

grant table v2 status pages may remain accessible after de-allocation (take two) Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes. This bug was fortuitously fixed by code cleanup in Xen 4.14, and backported to security-supported Xen branches as a prerequisite of the fix for XSA-378.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 6.9
Vector AV:L/AC:M/Au:N/C:C/I:C/A:C
Access Vector Local
Access Complexity Medium
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 7 6.3
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
Access Vector Local Local
Access Complexity High High
Privileges Required Low Low
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact High None
Availability Impact High High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1192555 [RESOLVED / FIXED]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Linux Enterprise Server 11 SP4-LTSS
  • xen >= 4.4.4_50-61.67.1
  • xen-doc-html >= 4.4.4_50-61.67.1
  • xen-kmp-default >= 4.4.4_50_3.0.101_108.129-61.67.1
  • xen-kmp-pae >= 4.4.4_50_3.0.101_108.129-61.67.1
  • xen-libs >= 4.4.4_50-61.67.1
  • xen-libs-32bit >= 4.4.4_50-61.67.1
  • xen-tools >= 4.4.4_50-61.67.1
  • xen-tools-domU >= 4.4.4_50-61.67.1
 Patchnames:
slessp4-xen-14848

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Please note that this evaluation state might be work in progress, incomplete or outdated.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
HPE Helion OpenStack 8 xen Already fixed
SUSE CaaS Platform 4.0 xen Already fixed
SUSE CaaS Platform 4.5 xen Not affected
SUSE Enterprise Storage 6 xen Already fixed
SUSE Enterprise Storage 7 xen Not affected
SUSE Linux Enterprise Desktop 15 SP2 xen Not affected
SUSE Linux Enterprise Desktop 15 SP3 xen Not affected
SUSE Linux Enterprise Desktop 15 SP4 xen Not affected
SUSE Linux Enterprise High Performance Computing 12 SP5 xen Already fixed
SUSE Linux Enterprise High Performance Computing 15 LTSS xen Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP1 ESPOS xen Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS xen Already fixed
SUSE Linux Enterprise High Performance Computing 15 SP2 xen Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2 ESPOS xen Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS xen Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3 xen Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4 xen Not affected
SUSE Linux Enterprise Micro 5.0 xen Not affected
SUSE Linux Enterprise Micro 5.1 xen Not affected
SUSE Linux Enterprise Micro 5.2 xen Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 xen Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 xen Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 xen Not affected
SUSE Linux Enterprise Module for Server Applications 15 SP2 xen Not affected
SUSE Linux Enterprise Module for Server Applications 15 SP3 xen Not affected
SUSE Linux Enterprise Module for Server Applications 15 SP4 xen Not affected
SUSE Linux Enterprise Point of Service 11 SP3 xen Unsupported
SUSE Linux Enterprise Real Time 15 SP2 xen Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS xen Released
SUSE Linux Enterprise Server 12 SP2 BCL xen Already fixed
SUSE Linux Enterprise Server 12 SP3 BCL xen Already fixed
SUSE Linux Enterprise Server 12 SP3 ESPOS xen Already fixed
SUSE Linux Enterprise Server 12 SP3 LTSS xen Already fixed
SUSE Linux Enterprise Server 12 SP4 ESPOS xen Already fixed
SUSE Linux Enterprise Server 12 SP4 LTSS xen Already fixed
SUSE Linux Enterprise Server 12 SP5 xen Already fixed
SUSE Linux Enterprise Server 15 ESPOS xen Already fixed
SUSE Linux Enterprise Server 15 LTSS xen Already fixed
SUSE Linux Enterprise Server 15 SP1 LTSS xen Already fixed
SUSE Linux Enterprise Server 15 SP2 xen Not affected
SUSE Linux Enterprise Server 15 SP2 LTSS xen Not affected
SUSE Linux Enterprise Server 15 SP3 xen Not affected
SUSE Linux Enterprise Server 15 SP4 xen Not affected
SUSE Linux Enterprise Server Business Critical Linux 15 SP1 xen Already fixed
SUSE Linux Enterprise Server Business Critical Linux 15 SP2 xen Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 xen Already fixed
SUSE Linux Enterprise Server for SAP Applications 12 SP4 xen Already fixed
SUSE Linux Enterprise Server for SAP Applications 12 SP5 xen Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 xen Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP1 xen Already fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP2 xen Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 xen Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 xen Not affected
SUSE Linux Enterprise Storage 7 xen Not affected
SUSE Linux Enterprise Storage 7.1 xen Not affected
SUSE Manager Proxy 4.1 xen Not affected
SUSE Manager Proxy 4.2 xen Not affected
SUSE Manager Proxy 4.3 xen Not affected
SUSE Manager Retail Branch Server 4.1 xen Not affected
SUSE Manager Retail Branch Server 4.2 xen Not affected
SUSE Manager Retail Branch Server 4.3 xen Not affected
SUSE Manager Server 4.1 xen Not affected
SUSE Manager Server 4.2 xen Not affected
SUSE Manager Server 4.3 xen Not affected
SUSE OpenStack Cloud 8 xen Already fixed
SUSE OpenStack Cloud 9 xen Already fixed
SUSE OpenStack Cloud Crowbar 8 xen Already fixed
SUSE OpenStack Cloud Crowbar 9 xen Already fixed