From Bluetooth smart locks to item trackers, Mobile-as-a-Gateway (MaaG) IoT devices are everywhere. MaaG IoT devices use mobile devices as gateways to connect to the internet for management. They allow for remote access sharing and revocation, while also providing "offline availability" for enhanced usability. However, in order for these functionalities to be realized, secure cooperation among the cloud service, the companion app, and the IoT device is necessary..... By: Jiale Guan (Jalon) , Zhiyun Qian , Luyi Xing , Xin'an Zhou Full Abstract and Presentation Materials: https://www.blackhat.com/asia-23/briefings/schedule/#dilemma-in-iot-access-control-revealing-novel-attacks-and-design-challenges-in-mobile-as-a-gateway-iot-31040