SB2020112802 - Security restrictions bypass in Linux kernel
Published: November 28, 2020 Updated: March 18, 2021
Security Bulletin ID
SB2020112802
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Security restrictons bypass (CVE-ID: CVE-2020-29373)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists in fs/io_uring.c in the Linux kernel due to insecure handling of the root directory during path lookups. A process inside a mount namespace can escape to unintended filesystem locations and read sensitive information.
Remediation
Install update from vendor's website.