Cross-App Interference Threats in Smart Homes: Categorization, Detection and Handling
Abstract
A number of Internet of Things (IoTs) platforms have emerged to enable various IoT apps developed by third-party developers to automate smart homes. Prior research mostly concerns the overprivilege problem in the permission model. Our work, however, reveals that even IoT apps that follow the principle of least privilege, when they interplay, can cause unique types of threats, named Cross-App Interference (CAI) threats. We describe and categorize the new threats, showing that unexpected automation, security and privacy issues may be caused by such threats, which cannot be handled by existing IoT security mechanisms. To address this problem, we present HOMEGUARD, a system for appified IoT platforms to detect and cope with CAI threats. A symbolic executor module is built to precisely extract the automation semantics from IoT apps. The semantics of different IoT apps are then considered collectively to evaluate their interplay and discover CAI threats systematically. A user interface is presented to users during IoT app installation, interpreting the discovered threats to help them make decisions. We evaluate HOMEGUARD via a proof-of-concept implementation on Samsung SmartThings and discover many threat instances among apps in the SmartThings public repository. The evaluation shows that it is precise, effective and efficient.
Cite
@article{arxiv.1808.02125,
title = {Cross-App Interference Threats in Smart Homes: Categorization, Detection and Handling},
author = {Haotian Chi and Qiang Zeng and Xiaojiang Du and Jiaping Yu},
journal= {arXiv preprint arXiv:1808.02125},
year = {2021}
}
Comments
An earlier version of this paper was submitted to ACM CCS'18 on May 9th, 2018. This version contains some minor modifications based on that submission. A newer version of this work has been published in IEEE/IFIP DSN 2020