Chapter

Cryptographic Hardware and Embedded Systems - CHES 2013

Volume 8086 of the series Lecture Notes in Computer Science pp 55-72

Non-invasive Spoofing Attacks for Anti-lock Braking Systems

  • Yasser ShoukryAffiliated withCyber-Physical Systems Laboratory, Dept. of Electrical Engineering, University of California at Los AngelesNetworked and Embedded Systems Lab., Dept. of Electrical Engineering, University of California at Los Angeles
  • , Paul MartinAffiliated withNetworked and Embedded Systems Lab., Dept. of Electrical Engineering, University of California at Los Angeles
  • , Paulo TabuadaAffiliated withCyber-Physical Systems Laboratory, Dept. of Electrical Engineering, University of California at Los Angeles
  • , Mani SrivastavaAffiliated withNetworked and Embedded Systems Lab., Dept. of Electrical Engineering, University of California at Los Angeles

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Abstract

This work exposes a largely unexplored vector of physical-layer attacks with demonstrated consequences in automobiles. By modifying the physical environment around analog sensors such as Antilock Braking Systems (ABS), we exploit weaknesses in wheel speed sensors so that a malicious attacker can inject arbitrary measurements to the ABS computer which in turn can cause life-threatening situations. In this paper, we describe the development of a prototype ABS spoofer to enable such attacks and the potential consequences of remaining vulnerable to these attacks. The class of sensors sensitive to these attacks depends on the physics of the sensors themselves. ABS relies on magnetic–based wheel speed sensors which are exposed to an external attacker from underneath the body of a vehicle. By placing a thin electromagnetic actuator near the ABS wheel speed sensors, we demonstrate one way in which an attacker can inject magnetic fields to both cancel the true measured signal and inject a malicious signal, thus spoofing the measured wheel speeds. The mounted attack is of a non-invasive nature, requiring no tampering with ABS hardware and making it harder for failure and/or intrusion detection mechanisms to detect the existence of such an attack. This development explores two types of attacks: a disruptive, naive attack aimed to corrupt the measured wheel speed by overwhelming the original signal and a more advanced spoofing attack, designed to inject a counter-signal such that the braking system mistakenly reports a specific velocity. We evaluate the proposed ABS spoofer module using industrial ABS sensors and wheel speed decoders, concluding by outlining the implementation and lifetime considerations of an ABS spoofer with real hardware.

Keywords

Automotive embedded systems Cyber-physical security Non-invasive sensor attacks Magnetic sensors