Ubuntu Security Notice USN-767-1 – Tavis Ormandy discovered that FreeType did not correctly handle certain large values in 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/77063/USN-767-1.txt
Source: https://packetstormsecurity.com/files/77063/Ubuntu-Security-Notice-767-1.html