Add read/write capabilities to modbusclient
Arnaud SOULLIE
parent
c2bb26590c
commit
a2ccbf9833
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@ -8,74 +8,151 @@ require 'msf/core'
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class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::Remote::Tcp
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include Msf::Auxiliary::Fuzzer
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include Rex::Socket::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Modbus Client Utility',
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'Name' => 'Modbus client, reloaded.',
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'Description' => %q{
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This module sends a command (0x06, write to one register) to a Modbus endpoint.
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You can change port, IP, register to write and data to write, as well as unit-id.
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This module allows reading and writing data to a PLC using the Modbus protocol.
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Modbus is a clear text protocol used in common SCADA systems, developed
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originally as a serial-line (RS232) async protocol. It is later transformed
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to IP, which is called ModbusTCP.
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There are a handful of functions which are possible to do, but this
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client has only implemented the function "write value to register" (\x48).
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This module is based on the 'modiconstop.rb' Basecamp module from
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DigitalBond, as well as the mbtget perl script.
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},
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'Author' => [ 'EsMnemon <esm[at]mnemonic.no>' ],
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'References' =>
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'Author' =>
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[
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['URL', 'http://www.saia-pcd.com/en/products/plc/pcd-overview/Pages/pcd1-m2.aspx']
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'EsMnemon <esm [at] mnemonic.no>', # original write-only module
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'Arnaud SOULLIE <arnaud.soullie[at]solucom.fr>', # new code that allows read/write
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],
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'License' => MSF_LICENSE,
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'DisclosureDate' => 'Nov 1 2011'
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))
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register_options([
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register_options(
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[
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OptEnum.new("MODE", [true, 'Command', "READ_REGISTER",
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[
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"READ_REGISTER",
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"READ_COIL",
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"WRITE_REGISTER",
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"WRITE_COIL"
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]
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]),
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Opt::RPORT(502),
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OptInt.new('UNIT_ID', [true, "ModBus Unit Identifier ", 1]),
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OptInt.new('MODVALUE', [true, "ModBus value to write (data) ", 2]),
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OptInt.new('REGIS', [true, "ModBus Register definition", 1002])
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OptInt.new('DATA', [false, "Data to write (WRITE_COIL and WRITE_REGISTER modes only)", 0xBEEF]),
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OptInt.new('DATA_ADDRESS', [true, "Modbus data address", 0]),
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OptInt.new('UNIT_NUMBER', [false, "Modbus unit number (255 if not used)", 255]),
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], self.class)
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end
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# Don't mess with live production SCADA systems
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def scada_write_warning
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print_status("Warning : do not try to alter live SCADA configuration. Bad shit can happened. Continue ? (y/n)")
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go_on = gets
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unless go_on.chomp == 'y'
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print_error("Stopping module")
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exit
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end
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end
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# a wrapper just to be sure we increment the counter
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def sendframe(payload)
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sock.put(payload)
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@modbuscounter += 1
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r = sock.recv(65535, 0.1)
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return r
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end
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def make_read_payload
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payload = ""
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payload += [datastore['UNIT_NUMBER']].pack("c")
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payload += [@function_code].pack("c")
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payload += [datastore['DATA_ADDRESS']].pack("n")
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payload += [1].pack("n")
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packetdata = ""
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packetdata += [@modbuscounter].pack("n")
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packetdata += "\x00\x00\x00" #dunno what these are
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packetdata += [payload.size].pack("c") # size byte
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packetdata += payload
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return packetdata
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end
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def make_write_coil_payload(data)
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payload = ""
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payload += [datastore['UNIT_NUMBER']].pack("c")
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payload += [@function_code].pack("c")
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payload += [datastore['DATA_ADDRESS']].pack("n")
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payload += [data].pack("c")
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payload += "\x00"
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packetdata = ""
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packetdata += [@modbuscounter].pack("n")
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packetdata += "\x00\x00\x00" #dunno what these are
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packetdata += [payload.size].pack("c") # size byte
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packetdata += payload
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return packetdata
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end
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def make_write_register_payload(data)
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payload = ""
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payload += [datastore['UNIT_NUMBER']].pack("c")
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payload += [@function_code].pack("c")
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payload += [datastore['DATA_ADDRESS']].pack("n")
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payload += [data].pack("n")
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packetdata = ""
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packetdata += [@modbuscounter].pack("n")
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packetdata += "\x00\x00\x00" #dunno what these are
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packetdata += [payload.size].pack("c") # size byte
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packetdata += payload
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return packetdata
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end
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def run
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trans_id ="\x21\x00"
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proto_id ="\x00\x00"
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len ="\x00\x06"
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func_id ="\x06"
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@modbuscounter = 0x0000 # used for modbus frames
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connect
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case datastore['MODE']
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when "READ_COIL"
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@function_code = 1
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response = sendframe(make_read_payload)
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print_good("Coil value at address #{datastore['DATA_ADDRESS']} : " + response.reverse.unpack("c").to_s.gsub('[', '').gsub(']', ''))
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#For debug: MODVALUE=19276 REGIS=18762, UNIT_ID=71
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#trans_id="\x41\x42"
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#proto_id="\x43\x44"
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#len="\x45\x46"
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#func_id="\x48"
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when "READ_REGISTER"
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@function_code = 3
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response = sendframe(make_read_payload)
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value = response.split[0][9..10].to_s.unpack("n").to_s.gsub('[', '').gsub(']','')
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print_good("Register value at address #{datastore['DATA_ADDRESS']} : " + value)
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sploit = trans_id
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sploit += proto_id
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sploit += len
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sploit += [datastore['UNIT_ID']].pack("C")
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sploit += func_id
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sploit += [datastore['REGIS']].pack("S").reverse
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sploit += [datastore['MODVALUE']].pack("S").reverse
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when "WRITE_COIL"
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scada_write_warning
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@function_code = 5
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if datastore['DATA'] == 0
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data = 0
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elsif datastore['DATA'] == 1
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data = 255
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else
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print_error("Data value must be 0 or 1 in WRITE_COIL mode")
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exit
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end
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response = sendframe(make_write_coil_payload(data))
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print_good("Value #{datastore['DATA']} successfully written at coil address #{datastore['DATA_ADDRESS']}")
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connect()
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sock.put(sploit)
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sock.get_once
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disconnect()
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when "WRITE_REGISTER"
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scada_write_warning
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@function_code = 6
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if datastore['DATA'] < 0 || datastore['DATA'] > 65535
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print_error("Data to write must be an integer between 0 and 65535 in WRITE_REGISTER mode")
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exit
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end
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response = sendframe(make_write_register_payload(datastore['DATA']))
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print_good("Value #{datastore['DATA']} successfully written at registry address #{datastore['DATA_ADDRESS']}")
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else
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print_error("Invalid MODE")
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return
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end
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end
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end
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=begin
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MODBUS: 10 00 00 00 00 06 01 06 03 ea 00 02
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tested on a SAIA PCD1.M2
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scapy - even with source-IP
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sploit="\x21\x00\x00\x00\x00\x06\x01\x06\x03\xea\x00\x02"
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ip=IP(dst="172.16.10.10",src="172.16.10.155",proto=6,flags=2)
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tcp=TCP(dport=509)
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send(ip/tcp/sploit)
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=end
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