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.
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.
| Link | Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2019/12/04/5 | mailing list exploit third party advisory |
| https://www.openbsd.org/errata66.html | vendor advisory |
| http://www.openwall.com/lists/oss-security/2019/12/04/5 | mailing list exploit third party advisory |
| https://seclists.org/bugtraq/2019/Dec/8 | mailing list exploit third party advisory |
| http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html | third party advisory |
| http://seclists.org/fulldisclosure/2019/Dec/14 | third party advisory mailing list |