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ZigBee Light Link (ZLL) is the low-power mesh network standard used byconnected lighting systems, such as Philips Hue, Osram Lightify, and GE Link.These lighting systems are intended for residential use but also deployed inhotels, restaurants, and industrial buildings. In this paper, we investigatethe current state of security in ZLL-based connected lighting systems. Weextend the scope of known attacks by describing novel attack procedures to showthat the ZLL standard is insecure by design. Using our penetration testingframework, we are able to take full control over all three systems mentionedabove. Besides novel attack procedures, we also extend the intended wirelessrange of max. 2 meters for configuring a ZLL device to over 30 meters, thusmaking ZLL-based systems susceptible to war driving. We conclude with adiscussion about the security needs of connected lighting systems and deriveseveral lessons for Internet of Things security that can be learned from theinsecure design of ZLL-based connected lighting systems.

All Your Bulbs Are Belong to Us: Investigating the Current State of Security in Connected Lighting Systems