HVACKer: Bridging the Air-Gap by Attacking the Air Conditioning System [article]

Yisroel Mirsky, Mordechai Guri, Yuval Elovici
2017 arXiv   pre-print
Modern corporations physically separate their sensitive computational infrastructure from public or other accessible networks in order to prevent cyber-attacks. However, attackers still manage to infect these networks, either by means of an insider or by infiltrating the supply chain. Therefore, an attacker's main challenge is to determine a way to command and control the compromised hosts that are isolated from an accessible network (e.g., the Internet). In this paper, we propose a new
more » ... ial model that shows how an air gapped network can receive communications over a covert thermal channel. Concretely, we show how attackers may use a compromised air-conditioning system (connected to the internet) to send commands to infected hosts within an air-gapped network. Since thermal communication protocols are a rather unexplored domain, we propose a novel line-encoding and protocol suitable for this type of channel. Moreover, we provide experimental results to demonstrate the covert channel's feasibility, and to calculate the channel's bandwidth. Lastly, we offer a forensic analysis and propose various ways this channel can be detected and prevented. We believe that this study details a previously unseen vector of attack that security experts should be aware of.
arXiv:1703.10454v1 fatcat:42kr2d4rcrebnj7n57pfz2wkcu