Ubuntu Security Notice USN-764-1 – Several flaws were discovered in the Firefox and XULRunner browser engines. These could lead to arbitrary code execution, spoofing attacks, and more.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/76952/USN-764-1.txt
Source: https://packetstormsecurity.com/files/76952/Ubuntu-Security-Notice-764-1.html