2021-38545 | Raspberry Pi 3 B+/4 B LED Hand Glowworm information exposure

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
2.0	$0-$5k	0.42

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.

Vendor

Name

VulDB Meta Base Score: 2.0
VulDB Meta Temp Score: 2.0

VulDB Base Score: 2.0
VulDB Temp Score: 2.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Information disclosure
CWE: CWE-203
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

08/11/2021 CVE assigned
08/12/2021 +1 days Advisory disclosed
08/12/2021 +0 days VulDB entry created
08/16/2021 +4 days VulDB last updateAdvisory: nassiben.com
Status: Not defined

CVE: CVE-2021-38545 (🔒)

Created: 08/12/2021 09:04
Updated: 08/16/2021 17:45
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍

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