alt Hacker NewsA couple years ago I worked on a service that had to communicate with a Siemens S7-1500 PLC. Based on my experience with that project, none of what I’ve read recently about unsecured industrial PLCs is surprising.
I opened Siemens TIA Portal and PLCSIM for the first time and thought “wow, I didn’t think the Windows 95 GUI library was still supported.” None of the PLC contractors we had hired knew how to enable TLS on the thing (user/pass eg admin/admin was their usual). Anecdote: I once spent hours reading the docs and clicking around trying to get it to accept an SSL certificate signed by a real CA and it wouldn’t go, but it accepted one I self-signed in openssl.
In all fairness, the people who are experts in the field of Siemens PLC programming are usually mechanical-ish engineers and security is not in their skill set or on their mind.
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Isn't this the industry expectation in that kind of equipment? If it was signed by a real CA the cert. could expire and render the equipment unable to communicate.
My mind was blown when I realized that the way tftp works is that as the machine is booting it asks the network if anyone has some software for it to run.
> In all fairness, the people who are experts in the field of Siemens PLC programming are usually mechanical-ish engineers and security is not in their skill set or on their mind.
Stuxnet was over a decade ago.
There should be a simple rule that everyone with the ability to understand things like PLCs should be able to grasp: your equipment does not touch the internet or external storage, period.
Those who can't grasp this concept should be shown the door with a recommendation that they find a less mentally-taxing line of work.
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Most factories I know do not allow their PLC be accessed from the internet. They are usually on a separate Network. However, the "engineering" station (the computer running e.g. TIA Portal) sometimes is.
The PLC engineers I had contact with usually had an electrical engineering background. That's why they like PLCs in the first place with the ladder logic programming languages, grafcet and if they feel fancy a bit of structured text (assembly like) or structured control language (pascal like). They indeed did not know much about software security but a great deal about machine safety.
A real security nightmare are older OPC servers (OPC-DA) which is super reliant on DCOM. OPC is quite important to connect the PLCs to SCADA systems or 3rd party devices.