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Device sharing among users is a common functionality in today&#x0027;s IoT clouds. Supporting device sharing are the delegation methods proposed by different IoT clouds, which we find are heterogeneous and ad-hoc &#x2014; IoT clouds use various data (e.g., device ID, product ID, and access token) as authorization certificates. In this paper, we report the first systematic study on how the authorization-data are managed in IoT device sharing. Our study brought to light the security risks in today&#x0027;s IoT authorization-data management, identifying 6 authorization-data leakage flaws. To mitigate such flaws, we propose an approach to hide the authorization-data from the delegatee (a.k.a., the user authorized to access the devices) without disrupting the device sharing services. We propose  SecHARE , an automated tool to patch the vulnerable IoT clouds. We applied  SecHARE  to 3 popular open-source IoT clouds. Results have shown the compatibility, effectiveness, and efficiency of  SecHARE . We have made  SecHARE  publicly available.

Leakage of Authorization-Data in IoT Device Sharing: New Attacks and Countermeasure