Secunia Security Advisory – Debian has issued an update for ruby1.8. This fixes some vulnerabilities, which can be exploited by malicious people to bypass certain security restrictions or cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/49497/sa21657.txt
Source: https://packetstormsecurity.com/files/49497/Secunia-Security-Advisory-21657.html