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MEDIUM · 5.9

CVE-2021-38545

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 ...

Vulnerability Description

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.

CVSS Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE

Affected Products

VendorProductVersions
RaspberrypiRaspberry Pi 4 Model B Firmware<= 2021-08-09
RaspberrypiRaspberry Pi 4 Model B-
RaspberrypiRaspberry Pi 3 Model B\+ Firmware<= 2021-08-09
RaspberrypiRaspberry Pi 3 Model B\+-

References

FAQ

What is CVE-2021-38545?

CVE-2021-38545 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ...

How severe is CVE-2021-38545?

CVE-2021-38545 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-38545?

Check the references section above for vendor advisories and patch information. Affected products include: Raspberrypi Raspberry Pi 4 Model B Firmware, Raspberrypi Raspberry Pi 4 Model B, Raspberrypi Raspberry Pi 3 Model B\+ Firmware, Raspberrypi Raspberry Pi 3 Model B\+.