Raspberry Pi 3 B+ and 4 B devices through 2021-08-09, in certain specific use cases in which the device supplies power to audio-output equipment, allow remote attackers to recover speech signals from an LED on the device, via a telescope and an electro-optical sensor, aka a Glowworm attack. We assume that the Raspberry Pi supplies power to some speakers. The power indicator LED of the Raspberry Pi is connected directly to the power line, as a result, the intensity of a devices power indicator LED is correlative to the power consumption. The sound played by the speakers affects the Raspberry Pis power consumption and as a result is also correlative to the light intensity of the LED. By analyzing measurements obtained from an electro-optical sensor directed at the power indicator LED of the Raspberry Pi, we can recover the sound played by the speakers.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Raspberry_pi_4_model_b_firmware | Raspberrypi | * | 2021-08-09 (including) |