CVE-2021-38545 Information

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 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://www.nassiben.com/glowworm-attack

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9