Description
In OpenBSD 6.6, local users can use the su -L option to achieve any login class (often excluding root) because there is a logic error in the main function in su/su.c.
References
- https://www.openwall.com/lists/oss-security/2019/12/04/5
- https://www.openbsd.org/errata66.html
- https://github.com/openbsd/src/blob/2dfc98f42e117c7605b52b5020b630d98601dc22/usr.bin/su/su.c#L210-L211
- [oss-security] 20191204 Authentication vulnerabilities in OpenBSD mailing-list
- 20191205 Authentication vulnerabilities in OpenBSD mailing-list
- http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
- 20191206 Authentication vulnerabilities in OpenBSD mailing-list