Security features bypass in Xen - CVE-2023-46836

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Main Vulnerability Database Vulnerabilities #VU83163

Security features bypass in Xen - CVE-2023-46836

Published: November 15, 2023


Vulnerability identifier: #VU83163
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-46836
CWE-ID: CWE-254
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote guest to bypass implemented security restrictions.

The vulnerability exists due to improper implementation of mitigations against BTC/SRSO. A malicious guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen, which can result in memory access to other guests.


Affected software

Xen
Gentoo Linux
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Software Development Kit 12
SUSE CaaS Platform
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
openSUSE Leap Micro
SUSE Enterprise Storage
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS
SUSE Linux Enterprise Server 15 SP1 LTSS
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP3 LTSS
Server Applications Module
Basesystem Module
openSUSE Leap
Fedora
ObjectScale
Dell EMC PowerStore Family Operating System
xen-devel
xen-debugsource
xen
xen-tools-debuginfo
xen-tools-domU
xen-libs
xen-doc-html
xen-tools-domU-debuginfo
xen-libs-32bit
xen-libs-debuginfo-32bit
xen-tools
xen-libs-debuginfo
xen-tools-xendomains-wait-disk
xen-libs-32bit-debuginfo
xen-libs-64bit
xen-libs-64bit-debuginfo
app-emulation/xen

How to mitigate CVE-2023-46836

Install updates from vendor's website.

ObjectScale - update to 1.4.0
Dell EMC PowerStore Family Operating System - update to 4.0.0.0-2284811
xen-devel - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-debugsource - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-tools-debuginfo - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-tools-domU - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-libs - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-doc-html - addressed in versions 4.12.4_42-3.100.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-tools-domU-debuginfo - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-libs-32bit - addressed in versions 4.12.4_42-3.100.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-libs-debuginfo-32bit - update to 4.12.4_42-3.100.1
xen-tools - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-libs-debuginfo - addressed in versions 4.12.4_42-3.100.1, 4.12.4_42-150100.3.98.1, 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-tools-xendomains-wait-disk - addressed in versions 4.13.5_08-150200.3.83.1, 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-libs-32bit-debuginfo - addressed in versions 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-libs-64bit - addressed in versions 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen-libs-64bit-debuginfo - addressed in versions 4.14.6_08-150300.3.60.1, 4.16.5_08-150400.4.40.1, 4.17.2_08-150500.3.15.1, 4.17.3_02-150500.3.18.1
xen - addressed in versions 4.16.5-4.fc37, 4.17.2-5.fc38, 4.17.2-5.fc39
app-emulation/xen - update to 4.17.4

External References

Related Security Bulletins