libc in OpenBSD 6.6 allows authentication bypass via the -schallenge username, as demonstrated by smtpd, ldapd, or radiusd. This is related to gen/auth_subr.c and gen/authenticate.c in libc (and login/login.c and xenocara/app/xenodm/greeter/verify.c).
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
| Link | Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2019/12/04/5 | mailing list third party advisory exploit |
| https://www.openbsd.org/errata66.html | vendor advisory |
| http://www.openwall.com/lists/oss-security/2019/12/04/6 | mailing list |
| http://www.openwall.com/lists/oss-security/2019/12/04/5 | mailing list third party advisory exploit |
| https://seclists.org/bugtraq/2019/Dec/8 | mailing list third party advisory exploit |
| 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 |