Debian Security Advisory 1372-1 – Aaron Plattner discovered a buffer overflow in the Composite extension of the X.org X server, which can lead to local privilege escalation.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/59181/dsa-1372-1.txt
Source: https://packetstormsecurity.com/files/59181/Debian-Linux-Security-Advisory-1372-1.html