Critical Security Vulnerability In Firefox 3.5

15 Lug/09

firefoxA critical security vulnerability affecting Firefox 3.5 has been discovered and published on the security portal Milw0rm entitled Firefox 3.5 Heap Spray Vulnerability. A proof of concept exploit has been provided. In short, the vulnerability can lead to remote code execution. The good news is that a security patch has already been published by Mozilla Links.

The security vulnerability can be fixed the following way. Type in about:config in the Firefox address bar and hit enter. Now filter for the term javascript.options.jit.content and double-click it afterwards to set it to false which disables the Tracemonkey JavaScript engine. This in turn could (and most likely will) reduce the JavaScript performance of the Firefox 3.5 web browser until an official security patch is provided by the Mozilla Firefox team.

The security patch is expected to be released soon by the Firefox development team. Stay tuned, we keep you updated.

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