Ubuntu Security Notice 469-1 – A weakness in APOP authentication has been discovered in Mozilla Thunderbird. Additionally, various flaws were discovered in the layout and JavaScript engines.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/57084/USN-469-1.txt
Source: https://packetstormsecurity.com/files/57084/Ubuntu-Security-Notice-469-1.html