Secunia Security Advisory – Debian has issued an update for zaptel. This fixes a vulnerability, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/73831/sa33498.txt
Source: https://packetstormsecurity.com/files/73831/Secunia-Security-Advisory-33498.html