Ubuntu Security Notice 3893-2 - USN-3893-1 fixed a vulnerability in Bind. This update provides the corresponding update for Ubuntu 12.04 ESM. It was discovered that Bind incorrectly handled certain trust anchors when used with the "managed-keys" feature. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. Various other issues were also addressed.
5778c1cb4220b77f63b382b2f6f6fefc45a291726a7d9add67768de05ae881ab