Resource management error in OpenBSD - CVE-2019-19522
Published: December 5, 2019 / Updated: November 21, 2020
Vulnerability identifier: #VU23425
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2019-19522
CWE-ID: CWE-399
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vendor: OpenBSD
Affected software:
OpenBSD
OpenBSD
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to an error in authentication process, where S/Key or YubiKey authentication is enabled. A local user can gain root privileges by leveraging membership in the auth group. This occurs because root's file can be written to /etc/skey or /var/db/yubikey, and need not be owned by root.
How to mitigate CVE-2019-19522
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.