Secunia Security Advisory – Ubuntu has issued an update for libgd2. This fixes some vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially compromise an application using the library.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/61940/sa28147.txt
Source: https://packetstormsecurity.com/files/61940/Secunia-Security-Advisory-28147.html