Ubuntu Security Notice USN-789-1 – Tielei Wang discovered that GStreamer Good Plugins did not correctly handle malformed PNG image files. If a user were tricked into opening a crafted PNG image file with a GStreamer application, an attacker could cause a denial of service via application crash, 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/78574/USN-789-1.txt
Source: https://packetstormsecurity.com/files/78574/Ubuntu-Security-Notice-789-1.html