Ubuntu Security Notice USN-4040-2

Ubuntu Security Notice USN-4040-2
Ubuntu Security Notice 4040-2 – USN-4040-1 fixed a vulnerability in expat. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. It was discovered that Expat incorrectly handled certain XML files. An attacker could possibly use this issue to cause a denial of service.