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In this paper, we analyze the ESP32 from a wireless security perspective. We reverse engineer the hardware and software components dedicated to Bluetooth Low Energy (BLE) on the ESP32 and ANT protocol on Nordic Semiconductors' nRF chips. Exploiting this, we then implement multiple attacks on the repurposed ESP32 targeting various wireless protocols, including ones not natively supported by the chip. We make link-layer attacks on BLE (fuzzing, jamming) and cross-protocol injections, with only software modifications. We also attack proprietary protocols on commercial devices like keyboards and ANT-based sports monitoring devices. Finally, we show the ESP32 can be repurposed to interact with Zigbee or Thread devices. In summary, we show that accessing low-level, non-documented features of the ESP32 can allow, possibly compromised, devices to mount attacks across many IoT devices.
Cayre et al. (Mon,) studied this question.