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Stuxnet Worm Infected Industrial Control Systems
Sooner Boomer writes "ComputerWorld has an article about the Stuxnet worm, which was apparently designed to steal industrial secrets and disrupt operations at industrial plants, according to Siemens. 'Stuxnet has infected systems in the UK, North America and Korea, however the largest number of infections, by far, have been in Iran. Once installed on a PC, Stuxnet uses Siemens' default passwords to seek out and try to gain access to systems that run the WinCC and PCS 7 programs — so-called PLC (programmable logic controller) programs that are used to manage large-scale industrial systems on factory floors and in military installations and chemical and power plants.' If the worm were to be used to disrupt systems at any of those locations, the results could be devastating."
Having worked in that industry, it's very common for them to be on the same network as Windows PCs. As for the default passwords, that's their own fault.
The reason they have to be on the same network as PCs is both:
1) The software to program and monitor PLCs are on Windows (made by Siemens, Rockwell Software, WonderWare, were the big names when I was in the industry 10 years ago), so it makes sense to have them on the same network so they can communicate with the PLC while it's online and see the logic operations in real time.
2) The biggest reason is that PLCs communicate with visualization software that runs on Windows (also made by the same companies as above), that can be viewed from a central location. This allows the production line manager to visually see the operations of the machines in a nicer format than looking at the raw logic bits. The visualization software can display shapes, colors, diagrams, animations, etc of the production line with real-time data about what's happening.
So yes, these PLCs are usually on the same network as Windows PCs. Ideally it's a private network with just the PLCs and the visualization/programming/monitoring PCs, but many places are not that strict about the network separation.
Things you think are in the Constitution, but are not.
Do you know that when you set a password on a siemens plc, it isn't enforced by the plc itself but by the step 7 programming software?
Use something else (e.g., libnodave) and access is wide open.
If they still use default password,
Having experience with a few of these systems from various vendors I say it would be great to have a choice in the matter. The is a lot of investment in the configuration of a large logic controller and vendors often provide themselves a back door such as a hidden admin password to come in and fix things when the system goes tits up. On top of that they often recommend not changing the default passwords of systems that are hooked directly to process control because the machines themselves are often under lock and key and behind firewalls and thus presumed to be "safe".
We were infected with the Stuxnet worm at our plant, and it spread all around the machines on the business network but never made it to the process control systems. Although it was still disruptive. The firewall was shutdown and the control network isolated for days so they could do a complete virus scan. A little network management and physical security can go a long way. Frankly if any virus gets onto the process machines, default password or not, and not even targeting the software for the control systems there's potential for a real "game over" event.