Modicon Modbus/TCP Programming Function Code Access

This script is Copyright (C) 2006-2017 Tenable Network Security, Inc.


Synopsis :

A Modicon PLC Modbus TCP interface is listening on TCP port 502 and is
accessible via proprietary function code 126.

Description :

A Modicon PLC Modbus TCP interface is listening on TCP port 502 and is
accessible via proprietary function code 126. An attacker that is able
to gain network access to this device can reprogram PLC logic or
otherwise impact the integrity of the physical process.

Solution :

Restrict incoming traffic on this port to authorized Modbus TCP
clients.

Risk factor :

Medium / CVSS Base Score : 6.4
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P)

Family: SCADA

Nessus Plugin ID: 23819 ()

Bugtraq ID:

CVE ID:

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