Ubuntu Security Notice USN-824-1 – It was discovered that PHP did not properly handle certain malformed JPEG images when being parsed by the Exif module. A remote attacker could exploit this flaw and cause the PHP server to crash, resulting in a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/80584/USN-824-1.txt
Source: https://packetstormsecurity.com/files/80584/Ubuntu-Security-Notice-824-1.html