SB2023040654 - Privilege escalation in Linux kernel dm-verity
Published: April 6, 2023
Security Bulletin ID
SB2023040654
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect authorization (CVE-ID: CVE-2022-20572)
CWE-ID: CWE-863 - Incorrect Authorization
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a missing permission check within the verity_target() function in dm-verity-target.c. A local user can modify read-only files and escalate privileges on the system.
Remediation
Install update from vendor's website.