Ubuntu Security Notice USN-681-1 – It was discovered that ImageMagick did not correctly handle certain malformed XCF images. If a user were tricked into opening a specially crafted image with an application that uses ImageMagick, an attacker could cause a denial of service and possibly execute arbitrary code with the user’s privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/72492/USN-681-1.txt
Source: https://packetstormsecurity.com/files/72492/Ubuntu-Security-Notice-681-1.html