Ubuntu Security Notice 4192-1 - It was discovered that
ImageMagick incorrectly handled certain malformed image files. If a
user or automated system using ImageMagick were tricked into
opening a specially crafted image, an attacker could exploit this
to cause a denial of service or possibly execute code with the
privileges of the user invoking the program.
Read more https://packetstormsecurity.com/files/155339/USN-4192-1.txt