SB2023010302 - Security restrictions bypass in Xen APIC accesses feature
Published: January 3, 2023
Security Bulletin ID
SB2023010302
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Privilege Management (CVE-ID: CVE-2022-42327)
CWE-ID: CWE-269 - Improper Privilege Management
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/U:Green
The vulnerability allows a malicious guest to escalate privileges on the system.
The vulnerability exists due to improper privilege management. A malicious guest is able to access unintended shared memory page, read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode.
Remediation
Install update from vendor's website.
References
- https://xenbits.xenproject.org/xsa/advisory-412.txt
- http://xenbits.xen.org/xsa/advisory-412.html
- http://www.openwall.com/lists/oss-security/2022/11/01/3
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/