Ubuntu Security Notice 503-1 – Various flaws were discovered in the layout and JavaScript engines. By tricking a user into opening a malicious email, an attacker could execute arbitrary code with the user’s privileges. Please note that JavaScript is disabled by default for emails, and it is not recommended to enable it. Jesper Johansson discovered that spaces and double-quotes were not correctly handled when launching external programs. In rare configurations, after tricking a user into opening a malicious email, an attacker could execute helpers with arbitrary arguments with the user’s privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/58855/USN-503-1.txt
Source: https://packetstormsecurity.com/files/58855/Ubuntu-Security-Notice-503-1.html