MIRACASE MHUB500 USB splitters 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 USB splitter supplies power to some speakers. The power indicator LED of the USB splitter is connected directly to the power line, as a result, the intensity of the USB splitters power indicator LED is correlative to its power consumption. The sound played by the connected speakers affects the USB splitters 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 USB splitter, we can recover the sound played by the connected speakers.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Miracase_hmub500_firmware | Benda | * | 2021-08-09 (including) |