2021-38545 | Raspberry Pi 3 B+/4 B LED Hand Glowworm information exposure
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A vulnerability classified as problematic has been found in Raspberry Pi 3 B+ and 4 B up to 2021-08-09. Affected is some unknown processing of the component LED Hand. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-203. This is going to have an impact on confidentiality. CVE summarizes:
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 device’s power indicator LED is correlative to the power consumption. The sound played by the speakers affects the Raspberry Pi’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 Raspberry Pi, we can recover the sound played by the speakers.
The weakness was presented 08/12/2021. The advisory is shared for download at nassiben.com. This vulnerability is traded as CVE-2021-38545 since 08/11/2021. The exploitability is told to be difficult. The attack needs to be approached locally. The exploitation doesn’t require any form of authentication. There are neither technical details nor an exploit publicly available.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
VulDB Meta Base Score: 2.0
VulDB Meta Temp Score: 2.0
Status: Not defined
0-Day Time: 🔒
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