Category: hacker news

Z-Shave. Exploiting Z-Wave downgrade attacks

TL;DR: Stronger S2 Z-Wave pairing security process can be downgraded to weak S0, exposing smart devices to compromise. Z-Wave uses a shared network key to secure traffic. This key is exchanged between the controller and the client devices (‘nodes’) when the devices are paired. The keys are used to protect the communications and prevent attackers exploiting joined devices. The earlier pairing process (‘S0’) had a vulnerability – the network key was transmitted between the nodes using a key of all zeroes, and could be sniffed by an attacker within RF range. This issue was documented by Sensepost in 2013....

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Z-Wave Downgrade Attack Left Over 100 Million IoT Devices Open to Hackers

Researchers have found that even after having an advanced encryption scheme in place, more than 100 million Internet-of-Things (IoT) devices from thousands of vendors are vulnerable to a downgrade attack that could allow attackers to gain unauthorized access to your devices. The issue resides in the implementation of Z-Wave protocol—a wireless, radio frequency (RF) based communications technology that is primarily being used by home automation devices to communicate with each other. Z-Wave protocol has been designed to offer an easy process to set up pairing and remotely control appliances—such as lighting control, security systems, thermostats, windows, locks, swimming pools...

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