Food for thought from Jim Sinopoli, an expert on bldg auto:
Depending on the building use and building control system, a security threat may be related to life safety, for example disrupting emergency power, lighting and HVAC in a critical healthcare space.
The threat to building systems is not hypothetical: The infamous Stuxnet cyber-attack in 2010 eventually affected programmable logic controllers (PLC), a controller that is often used in industry, commonly in buildings elevators, pumps, drives and lighting equipment.
In general, the building automation industry and facility management have treated the security of building control networks as a secondary or tertiary issue, if at all. The most popular security approach for a building management system (BMS) is to isolate the BMS — by not letting it connect to any other networks.
But that alone is a false sense of security. The BMS at a minimum will have fire systems, HVAC, access control, elevators and possibly lighting connected into it, potentially allowing access from one of those networks or one of the devices on those networks.
Source: http://electricalcontractor.com/?p=7223
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