Secunia Security Advisory – Ubuntu has issued an update for mailman. This fixes a vulnerability, which can be exploited by malicious people to cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/45150/sa19522.txt
Source: https://packetstormsecurity.com/files/45150/Secunia-Security-Advisory-19522.html