Debian Security Advisory DSA 848-1 – Jens Steube discovered two vulnerabilities in masqmail, a mailer for hosts without permanent internet connection. When sending failed mail messages, the address is not sanitized, which allows a local attacker to execute arbitrary commands as the mail user. When opening the log file, masqmail does not relinquish privileges, which allows a local attacker to overwrite arbitrary files via a symlink attack.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/40520/dsa-848-1.txt
Source: https://packetstormsecurity.com/files/40520/Debian-Linux-Security-Advisory-848-1.html