Formal security analysis of smart embedded systems

Abstract

Smart embedded systems are core components of Internet of Things (IoT). Many vulnerabilities and attacks have been discovered against different classes of IoT devices. Therefore, developing a systematic mechanism to analyze the security of smart embedded systems will help developers discover new attacks, and improve the design and implementation of the system. In this paper, we formally model the functionalitiy of smart meters, as an example of a widely used smart embedded device, using rewriting logic. We also define a formal set of actions for attackers. Our formal model enables us to automatically analyze the system, and using model-checking, find all the sequences of attacker actions that transition the system to any undesirable state. We evaluate the analysis results of our model on a real smart meter, and find that a sizeable set of the attacks found by the model can be applied to the smart meter, using only inexpensive, commodity off-the-shelf hardware.