Thunderbird, FireFox and WebKit vulnerabilities fixed on Ubuntu and Fedora

Ubuntu has announced that security vulnerabilities affecting WebKit libraries have been fixed and users are encouraged to upgrade. The announcement can be found at http://www.ubuntu.com/usn/usn-1195-1/ If a user were tricked into viewing a malicious
website, a remote attacker could exploit a variety of issues related to web
browser security, including cross-site scripting attacks, denial of
service attacks, and arbitrary code execution. WebKit is a web content engine, derived from KHTML and KJS from KDE, and used primarily in Apple's Safari browser. It is made to be embedded in other applications, such as mail readers, or web browsers.

Fedora released a new version of FireFox and Thunderbird that fixes multiple security vulnerabilities. The details can be found at http://lists.fedoraproject.org/pipermail/package-announce/2011-August/064383.html