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Another critical Mozilla/Firefox Flaw -arbitrary memory exposure


A vulnerability has been discovered in Mozilla Firefox, which can be exploited by malicious people to gain knowledge of potentially sensitive information.

The vulnerability is caused due to an error in the JavaScript engine, as a "lambda" replace exposes arbitrary amounts of heap memory after the end of a JavaScript string.

Successful exploitation may disclose sensitive information in memory

(possible exposure of passwords and sensitive information from forms)

Demo Exploit here:-


I understand firefox 1.03 will be released shortly to fix this flaw.
so it isnt really Mozilla at fault, its Sun Java.
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Captain_Cretin said:
so it isnt really Mozilla at fault, its Sun Java.

It's Javascript - nothing to do with Java, ie a mozilla flaw (full advisory here http://secunia.com/advisories/14820/ ), although not as serious as the Gif image buffer overflow vulnerability in the previous version which allowed arbitary code execution ( http://www.securityfocus.com/advisories/8275 ).

There's a release candidate available that should fix this. If you intend visiting a banking site with a vulnerable version I'd suggest closing the browser down and starting a new instance and closing that before visiting any other sites.
I stand corrected ( and will whip myself with birch twigs as soon as I can find some)
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