Ubuntu Security Notice USN-755-1 – Multiple flaws were discovered in the Kerberos GSS-API and ASN.1 routines that did not correctly handle certain requests. An unauthenticated remote attacker could send specially crafted traffic to crash services using the Kerberos library, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/76433/USN-755-1.txt
Source: https://packetstormsecurity.com/files/76433/Ubuntu-Security-Notice-755-1.html