Secunia Security Advisory – Debian has issued an update for squirrelmail. This fixes a vulnerability and a weakness, which can be exploited by malicious people to conduct cross-site request forgery attacks and cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/92775/sa40964.txt
Source: https://packetstormsecurity.com/files/92775/Secunia-Security-Advisory-40964.html