Secunia Security Advisory – Ubuntu has issued an update for kerberos. This fixes some vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service) and compromise a vulnerable system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/42091/sa17899.txt
Source: https://packetstormsecurity.com/files/42091/Secunia-Security-Advisory-17899.html