CVE-2021-38549 Information disclosure in n/a
Remote attackers can recover audio signals from connected speakers by analyzing the power indicator LED of the USB splitter.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-38549?
CVE-2021-38549 is a medium-severity vulnerability in n/a, published on 11 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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 splitter's power indicator LED is correlative to its power consumption. The sound played by the connected speakers affects the USB splitter's 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.
Which versions are affected by CVE-2021-38549?
It affects 1 product.
Products include Benda Miracase Hmub500 Firmware.
How do I fix CVE-2021-38549?
No fix has been published for CVE-2021-38549 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-38549 being exploited?
There is no known exploitation of CVE-2021-38549 in the wild and no public exploit code.
Sources
Also known as GHSA-2p24-ppfc-qr69.