Debian Security Advisory DSA 815-1 – Ilja van Sprundel discovered a serious lock file handling error in kcheckpass that can, in some configurations, be used to gain root access.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/40101/dsa-815-1.txt
Source: https://packetstormsecurity.com/files/40101/Debian-Linux-Security-Advisory-815-1.html