SB2023031719 - Information disclosure in Linux kernel VGA
Published: March 17, 2023
Security Bulletin ID
SB2023031719
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Physical access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2020-28097)
The vulnerability allows an attacker with physical access to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in the Linux kernel’s implementation of the invert video code on VGA consoles. A local user with access to the VGA console can scroll the console, calling an ioctl TIOCL_SCROLLCONSOLE to crash the system, potentially reading random out-of-bound memory on the system.
Remediation
Install update from vendor's website.
References
- https://github.com/torvalds/linux/commit/973c096f6a85e5b5f2a295126ba6928d9a6afd45
- https://seclists.org/oss-sec/2020/q3/176
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.10
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=973c096f6a85e5b5f2a295126ba6928d9a6afd45
- https://security.netapp.com/advisory/ntap-20210805-0001/