SB2022021728 - Ubuntu update for libarchive
Published: February 17, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) UNIX symbolic link following (CVE-ID: CVE-2021-23177)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a symlink following issue when extracting files from archive, which can lean to changing ACLs of the target of the link. A local user can create a specially crafted archive, trick the victim into extracting files from it and escalate privileges on the system.
2) UNIX symbolic link following (CVE-ID: CVE-2021-31566)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a symlink following issue when extracting files from the archive. A local user can create a specially crafted symbolic link to a critical file on the system, place it into an archive and modify modes, times, access control lists, and flags of a file outside of the archive.
3) Use-after-free (CVE-ID: CVE-2021-36976)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in copy_string. A remote attacker can cause a denial of service condition on the target system.
Remediation
Install update from vendor's website.