Ubuntu Security Notice 590-1 – It was discovered that bzip2 did not correctly handle certain malformed archives. If a user or automated system were tricked into processing a specially crafted bzip2 archive, applications linked against libbz2 could be made to crash, possibly leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/64846/USN-590-1.txt
Source: https://packetstormsecurity.com/files/64846/Ubuntu-Security-Notice-590-1.html