CVE-2021-38548 : Security Advisory and Response
Discover the impact of CVE-2021-38548, a vulnerability in JBL Go 2 devices allowing recovery of sound signals via LED. Learn about affected versions and mitigation steps.
This article delves into the details of CVE-2021-38548, highlighting the vulnerability found in JBL Go 2 devices that allows remote attackers to recover speech signals through an LED using a unique attack method known as the 'Glowworm' attack.
Understanding CVE-2021-38548
This section explores the nature of the vulnerability and its potential impact on affected devices.
What is CVE-2021-38548?
The vulnerability in JBL Go 2 devices enables malicious actors to retrieve speech signals from the device's LED using a telescope and an electro-optical sensor, a technique known as the 'Glowworm' attack.
The Impact of CVE-2021-38548
The exploitation of this vulnerability can allow unauthorized users to intercept sound played by the speakers by analyzing measurements obtained from the power indicator LEDs.
Technical Details of CVE-2021-38548
This section provides a deeper look into the specifics of the vulnerability.
Vulnerability Description
The power indicator LED of JBL Go 2 speakers, directly connected to the power line, correlates its intensity with power consumption, enabling attackers to recover sound signals through the LED.
Affected Systems and Versions
All JBL Go 2 devices through 2021-08-09 are affected by this vulnerability.
Exploitation Mechanism
Attackers can leverage a telescope and an electro-optical sensor to analyze power indicator LED intensity and recover speech signals played by the speakers.
Mitigation and Prevention
Here we discuss the steps to mitigate the risks posed by CVE-2021-38548 and prevent potential exploitation.
Immediate Steps to Take
Users are advised to be cautious with their JBL Go 2 devices, especially when in proximity to sophisticated surveillance equipment.
Long-Term Security Practices
Considering the nature of the attack, physical security measures are crucial to prevent unauthorized access to the LED signals.
Patching and Updates
It is essential for the vendor to address this vulnerability through firmware updates and security patches.