Secunia Security Advisory – Ubuntu has issued an update for ruby1.8. This fixes some vulnerabilities, which can be exploited by malicious people to bypass certain security restrictions, cause a DoS (Denial of Service), and conduct spoofing attacks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/70787/sa32219.txt
Source: https://packetstormsecurity.com/files/70787/Secunia-Security-Advisory-32219.html