Ubuntu Security Notice USN-230-1 – Simon Kilvington discovered a buffer overflow in the avcodec_default_get_buffer() function of the ffmpeg library. By tricking an user into opening a malicious movie which contains specially crafted PNG images, this could be exploited to execute arbitrary code with the user’s privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/42302/USN-230-1.txt
Source: https://packetstormsecurity.com/files/42302/Ubuntu-Security-Notice-230-1.html