[PDF][PDF] Schedule-based side-channel attack in fixed-priority real-time systems

CY Chen, A Ghassami, S Nagy, MK Yoon, S Mohan… - 2015 - ideals.illinois.edu
Security failures in real-time embedded systems can have catastrophic effects and can lead
to injury to (or even loss of life for) humans, damage to the system and also environmental
fallouts. Until recently security was an afterthought in the design of such systems. Even less
understood are attack mechanisms that target real-time systems. In this paper we present a
novel attack model and algorithm to extract the exact schedules of real-time systems
designed using fixed priority algorithms. The attack is demonstrated on a real hardware …
Abstract
Security failures in real-time embedded systems can have catastrophic effects and can lead to injury to (or even loss of life for) humans, damage to the system and also environmental fallouts. Until recently security was an afterthought in the design of such systems. Even less understood are attack mechanisms that target real-time systems.
In this paper we present a novel attack model and algorithm to extract the exact schedules of real-time systems designed using fixed priority algorithms. The attack is demonstrated on a real hardware platform and shows a high success rate. The leaked schedules are then used to launch a side-channel attack against a specific victim task. Our algorithm is robust in the presence of some schedule randomization defenses as well as jitters.
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