by Ryan Naraine
November 12th, 2008 @ 7:40 pm

Mozilla has released a new version of its flagship Firefox browser to fix a total of 11 vulnerabilities that expose users to code execution, information stealing or denial-of-service attacks. Four of the 11 flaws covered with the new Firefox 3.0.4 are rated “critical” because of the risk of code execution attacks via specially rigged Web pages.

The four critical vulnerabilities are:
* MFSA 2008-55 Crash and remote code execution in nsFrameManager. A vulnerability in part of Mozilla’s DOM constructing code can be exploited by modifying certain properties of a file input element before it has finished initializing. When the blur method of the modified input element is called, uninitialized memory is accessed by the browser, resulting in a crash. This crash may be used by an attacker to run arbitrary code on a victim’s computer.

* MFSA 2008-54 Buffer overflow in http-index-format parser. This is a flaw in the way Mozilla parses the http-index-format MIME type. By sending a specially crafted 200 header line in the HTTP index response, an attacker can cause the browser to crash and run arbitrary code on the victim’s computer.

* MFSA 2008-53 XSS and JavaScript privilege escalation via session restore. The browser’s session restore feature can be used to violate the same-origin policy and run JavaScript in the context of another site. Any otherwise unexploitable crash can be used to force the user into the session restore state. This vulnerability could also be used by an attacker to run arbitrary JavaScript with chrome privileges.......