Permissions, Privileges, and Access Controls in Sudo - CVE-2019-19234
Published: December 20, 2019 / Updated: January 30, 2020
Vulnerability identifier: #VU23782
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-19234
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Sudo
Sudo
Software vendor:
Sudo
Sudo
Description
The vulnerability allows a local user to impersonate other users on the system.
The vulnerability exists due to incorrect handling of the blocked users (e.g., by using the ! character in the shadow file instead of a password hash) in sudo. A local user with access to a Runas ALL sudoer account can impersonate blocked users.
Remediation
Install update from vendor's website.