PAM-MySQL: Multiple vulnerabilities

Background

PAM-MySQL is a PAM module used to authenticate users against a MySQL backend.

Description

A flaw in handling the result of pam_get_item() as well as further unspecified flaws were discovered in PAM-MySQL.

Impact

By exploiting the mentioned flaws an attacker can cause a Denial of Service and thus prevent users that authenticate against PAM-MySQL from logging into a machine. There is also a possible additional attack vector with more malicious impact that has not been confirmed yet.

Workaround

There is no known workaround at this time.

Resolution

All PAM-MySQL users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=sys-auth/pam_mysql-0.7_rc1"