Mandriva Linux Security Advisory – A vulnerability was discovered in KDM by Kees Huijgen where under certain circumstances and in particular configurations, KDM could be tricked into allowing users to login without a password.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/59677/MDKSA-2007-190.txt
Source: https://packetstormsecurity.com/files/59677/Mandriva-Linux-Security-Advisory-2007.190.html