Secunia Security Advisory – Debian has issued an update for ruby1.8 and ruby1.9. This fixes some vulnerabilities, which can be exploited by malicious people to conduct spoofing attacks and cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/80352/sa36298.txt
Source: https://packetstormsecurity.com/files/80352/Secunia-Security-Advisory-36298.html