Description
OpenBSD 6.6, in a non-default configuration where S/Key or YubiKey authentication is enabled, allows local users to become root 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.
References (6)
Core 6
Core References
Exploit, Mailing List, Third Party Advisory x_refsource_misc
https://www.openwall.com/lists/oss-security/2019/12/04/5
Vendor Advisory x_refsource_misc
https://www.openbsd.org/errata66.html
Exploit, Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
http://www.openwall.com/lists/oss-security/2019/12/04/5
Exploit, Mailing List, Third Party Advisory mailing-list
x_refsource_bugtraq
https://seclists.org/bugtraq/2019/Dec/8
Third Party Advisory x_refsource_misc
http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
Third Party Advisory mailing-list
x_refsource_fulldisc
http://seclists.org/fulldisclosure/2019/Dec/14
Scores
CVSS v3
7.8
EPSS
0.0020
EPSS Percentile
41.7%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-732
Status
published
Products (1)
openbsd/openbsd
6.6
Published
Dec 05, 2019
Tracked Since
Feb 18, 2026