Ubuntu Security Notice 993-1 – Stefan Cornelius discovered that libgdiplus incorrectly handled certain image files. If a user or automated system were tricked into opening a crafted image file, an attacker could cause a denial of service or possibly 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/94339/USN-993-1.txt
Source: https://packetstormsecurity.com/files/94339/Ubuntu-Security-Notice-993-1.html