SB2021040712 - Arbitrary file overwrite in Open Container Initiative umoci
Published: April 7, 2021
Security Bulletin ID
SB2021040712
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) UNIX symbolic link following (CVE-ID: CVE-2021-29136)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a symlink following issue when processing crafted images. A remote attacker can create a specially crafted image with symbolic link to a critical file on the system and overwrite it, when "umoci unpack" or "umoci raw unpack" is used.
Successful exploitation of this vulnerability may result in privilege escalation.
Remediation
Install update from vendor's website.