U.S. Department of Homeland Security warns of growing threat of hackers targeting industrial control systems. DHS issued an alert (PDF) on Thursday about an undocumented software backdoor in industrial control system systems. The backdoor allows anyone with the proper command syntax and inner workings of the device to gain remote access to the device. The software backdoor is widely used in power plants, military environments and nautical ships. A researcher says he found 117 vulnerable PLCs with no authentication needed to perform a privileged command.”]