Ubuntu Security Notice USN-801-1 – Tielei Wang and Tom Lane discovered that the TIFF library did not correctly handle certain malformed TIFF images. If a user or automated system were tricked into processing a malicious image, an attacker could execute arbitrary code with the privileges of the user invoking the program.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/79141/USN-801-1.txt
Source: https://packetstormsecurity.com/files/79141/Ubuntu-Security-Notice-801-1.html