Recently, Armis security researchers have reported that Schneider Electric's programmable logic manipulators (PLCs) have serious and unpatched gaps in long-distance code fulfillment, allowing intruders to manipulate their various industrial systems.
Schneider Electric's Modicon manipulator series is one of the first PLCs on the market to connect industrial equipment, from oil and gas pipelines to manufacturing systems and water purification facilities, into a single network. However, research has found that there is a serious gap in the product: the ability for anyone to use hidden commands to bypass authentication and control the device.
Armis researchers found that these instructions can be used to take over the PLC and take native code fulfillment on the device, which can be used to change the operation of the PLC, along with hiding the changes to the engineering workstation handling the PLC. This intrusion is an unauthenticated intrusion that only requires network access to the target PLC. Said the information security analyst.
The gap is called "ModiPwn" and Schneider Electric claims to have patched it. Armis researchers found that these patches only work if the application code is encrypted, and we have found a number of ways to circumvent the code, even on the latest software versions, which allow everyone to open the gap again.
To make matters worse, the crevices that began to be classified as causing denial-of-service (DoS) intrusions were found to allow long-distance code fulfillment – meaning that an unauthenticated intruder would be able to fully manipulate the PLC and, in turn, any industrial equipment it uses.
Schneider Electric confirmed the gaps and promised a patch by the end of the year. However, for Schneider Electric's customers, these devices need to be further verified to be safe, even if patches are installed.
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