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Firefox 3.5 escape() Return Value Memory Corruption

This module exploits a memory corruption vulnerability in the Mozilla Firefox browser. This flaw occurs when a bug in the javascript interpreter fails to preserve the return value of the escape() function and results in uninitialized memory being used instead. This module has only been tested on Windows, but should work on other platforms as well with the current targets.

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Module Name



  • Simon Berry-Byrne <x00050876 [at]>
  • hdm <x [at]>



  • Firefox 3.5.0 on Windows XP SP0-SP3
  • Firefox 3.5.0 on Mac OS X 10.5.7 (Intel)


  • windows
  • osx


  • x86



Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/multi/browser/firefox_escape_retval msf exploit(firefox_escape_retval) > show targets ...targets... msf exploit(firefox_escape_retval) > set TARGET <target-id> msf exploit(firefox_escape_retval) > show options and set options... msf exploit(firefox_escape_retval) > exploit

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