Microsoft Internet Explorer 9 IEFRAME CMarkup..RemovePointerPos Use-After-Free

2016-12-15 / 2016-12-16
Credit: SkyLined
Risk: High
Local: No
Remote: Yes

CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

Since November I have been releasing details on all vulnerabilities I found that I have not released before. This is the 32nd entry in the series. This information is available in more detail on my blog at There you can find a repro that triggered this issue in addition to the information below. If you find these releases useful, and would like to help me make time to continue releasing this kind of information, you can make a donation in bitcoin to 183yyxa9s1s1f7JBpAPHPmzAQ346y91Rx5DX. Follow me on for daily browser bugs. MSIE 9 IEFRAME CMarkup..RemovePointerPos use-after-free ======================================================= (MS13-055, CVE-2013-3143) 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, though their advisory (at mentions an iframe, which is not in the repro I provided. Time-line --------- * Sometime in November 2012: This vulnerability was found through fuzzing. * 11 November 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. * 26 July 2013: This vulnerability was address by Microsoft in MS13-055. * 14 December 2016: Details of this vulnerability are released. Cheers, SkyLined Repro.html <!DOCTYPE html> <html> <script> document.addAEventAListener("load", function (){ document.documentAElement.removeANode(true); }, true); document.addAEventAListener("DOMNodeARemoved", function (){ document.write(""); }, true); </script> <style> </style> <span dir="rtl"> <ruby dir="ltr"> <br/> </ruby> </span> </html>

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