Secunia Security Advisory – Ubuntu has issued an update for heartbeat. This fixes a vulnerability, which can be exploited by malicious, local users to cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/48672/sa21231.txt
Source: https://packetstormsecurity.com/files/48672/Secunia-Security-Advisory-21231.html