Ubuntu Security Notice 940-1 – It was discovered that Kerberos did not correctly free memory in the GSSAPI and kdb libraries. If a remote attacker were able to manipulate an application using these libraries carefully, the service could crash, leading to a denial of service. Joel Johnson, Brian Almeida, and Shawn Emery discovered that Kerberos did not correctly verify certain packet structures. An unauthenticated remote attacker could send specially crafted traffic to cause the KDC or kadmind services to crash, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/89725/USN-940-1.txt
Source: https://packetstormsecurity.com/files/89725/Ubuntu-Security-Notice-940-1.html