Secunia Security Advisory – Ubuntu has issued an update for libungif4g. This fixes two vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially to compromise a user’s system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/41366/sa17488.txt
Source: https://packetstormsecurity.com/files/41366/Secunia-Security-Advisory-17488.html