Ubuntu Security Notice 963-1 – Robert Swiecki discovered that FreeType did not correctly handle certain malformed font files. If a user were tricked into using a specially crafted font file, a remote attacker could execute arbitrary code with user privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/92002/USN-963-1.txt
Source: https://packetstormsecurity.com/files/92002/Ubuntu-Security-Notice-963-1.html