full-disclosure - Re: scada/plc gear

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Date: Tue, 15 Jan 2008 13:04:49 -0500
From: gmaggro <gmaggro@...ers.com>
To: Full Disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: scada/plc gear

The Phoenix Contact 'FL IL 24 BK-PAC' arrived the other day. It is a 
wonderfully German piece of DIN rail 
(http://www3.telus.net/public/dt0116/items/dinrails.jpg) gear:

http://eshop.phoenixcontact.com/phoenix/images/productimages/large/20260_1000_int_04.jpg
http://eshop.phoenixcontact.com/phoenix/treeViewClick.do?UID=2862314

There is a two digit LED display on it, with a reset button underneath. 
As soon as I saw that, I figured stability would be an issue. This 
turned out to be a correct assumption. While the most agressive of nmap 
scans did not lock it up for me, Nessus (with everything enabled) did 
every time. Normally the display reads '82' but when it goes south it 
reads '88'.

In any case, nmap -TUVRC -p1-65535 shows TCP 80, 502, 1962 open along 
with UDP 7, 161, 199, 1059, and 5500. Very interesting stuff. I've had 
many dealings with networks of hundreds of thousands to millions of 
nodes, and though the reasonable explanation is that I've forgotten it, 
I don't ever recall seeing 1962/tcp and 5500/udp open. MAC prefix is 
00:A0:45 (Phoenix Contact Gmbh & CO.). OS details, well... I severely 
doubt this is a 3COM lan modem or Dell laser printer.

Hitting just 502 with crud caused it to stop responding within 10-30 
seconds, but after a similarly short interval, 502 started responding again.

snmpwalking it gives a sysDescr of "Ethernet bus terminal", a sysName of 
"FL IL 24 BK" and the ifDescr say "NET+ARM 10/100 Megabit Ethernet 
Driver by NETSilicon" and "pNA+ Loopback Driver".

80 says "NET+ARM Web Server/1.00", and feels pretty snappy. The web 
page, in addition to configuration options, also supplies a wiring 
diagram and a mock-up the faceplate with status LEDs, and other 
reference information (status codes, etc).

Reading through the manual/PDFs for this device indicates that it uses 
Interbus protocol, which has since been subsumed into something called 
Profinet. Awesome - something new to explore.

I'd recommend picking up a FLIL24BK since it runs quite the profile of 
interesting stuff in addition to modbus. I don't get why echo is there, 
unless the developers thought it would serve as some kind of diagnostic 
facility. It also responds quite differently to the mbread (from the 
modbus-0.9 package) command.

-----------------------------

I was made aware of an interesting and easy-to-use fuzzing program that 
contains modbus testing functionality: 
http://www.beyondsecurity.com/bestorm_overview.html

Now it's too expensive for individual purchase (it appears to be geared 
towards businesses) but they have a 30 minute time limited demo that is 
quite functional. It's windows only. Someone might find it valuable to 
fire it up against a modbus target, along with a sniffer to see what's 
going on. For beginners or GUI only folks, it would make a great 
introduction.

Scapy (http://www.secdev.org/projects/scapy/) is proving a nice & 
powerful framework for mucking around. It has a 'fuzz' command which, 
though simple, ought to be enough to construct some very handy stuff.

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