Ubuntu Security Notice USN-797-1 – It was 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, a remote attacker could cause an application linked against libtiff to crash, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/78942/USN-797-1.txt
Source: https://packetstormsecurity.com/files/78942/Ubuntu-Security-Notice-797-1.html