module

Modbus Unit ID and Station ID Enumerator

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Disclosed
2012-10-28
Created
2018-05-30

Description

Modbus is a cleartext protocol used in common SCADA systems, developed
originally as a serial-line (RS232) async protocol, and later transformed
to IP, which is called ModbusTCP. default tcp port is 502.

This module sends a command (0x04, read input register) to the modbus endpoint.
If this command is sent to the correct unit-id, it returns with the same function-id.
if not, it should be added 0x80, so that it sys 0x84, and an exception-code follows
which do not interest us. This does not always happen, but at least the first 4
bytes in the return-packet should be exact the same as what was sent.

You can change port, ip and the scan-range for unit-id. There is also added a
value - BENICE - to make the scanner sleep a second or more between probes. We
have seen installations where scanning too many too fast works like a DoS.

Author

EsMnemon esm@mnemonic.no

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:


    msf > use auxiliary/scanner/scada/modbus_findunitid
    msf auxiliary(modbus_findunitid) > show actions
        ...actions...
    msf auxiliary(modbus_findunitid) > set ACTION < action-name >
    msf auxiliary(modbus_findunitid) > show options
        ...show and set options...
    msf auxiliary(modbus_findunitid) > run
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