CVE-2021-38543 : Security Advisory and Response
Learn about CVE-2021-38543, a vulnerability in TP-Link UE330 USB splitter devices allowing eavesdropping via a 'Glowworm' attack utilizing a telescope and electro-optical sensor.
This article discusses CVE-2021-38543, also known as the 'Glowworm' attack, targeting TP-Link UE330 USB splitter devices.
Understanding CVE-2021-38543
CVE-2021-38543 is a vulnerability that allows remote attackers to recover speech signals from an LED on TP-Link UE330 USB splitter devices. The attack involves utilizing a telescope and an electro-optical sensor.
What is CVE-2021-38543?
The vulnerability in TP-Link UE330 USB splitter devices, up to 2021-08-09, permits the retrieval of speech signals from the power indicator LED. This is accomplished by correlating the LED's light intensity with power consumption influenced by connected speakers.
The Impact of CVE-2021-38543
Remote attackers can exploit this vulnerability to eavesdrop on conversations or private audio signals transmitted through the connected speakers, compromising user privacy and sensitive information.
Technical Details of CVE-2021-38543
The vulnerability is a result of certain specific use cases where the USB splitter supplies power to audio-output equipment.
Vulnerability Description
By analyzing measurements from an electro-optical sensor directed at the LED, attackers can recover sounds played through the connected speakers, exploiting the correlation between power consumption and LED light intensity.
Affected Systems and Versions
TP-Link UE330 USB splitter devices through 2021-08-09 are affected by this vulnerability when supplying power to audio-output equipment.
Exploitation Mechanism
Attackers utilize a telescope and an electro-optical sensor to recover speech signals from the LED on the USB splitter, executing a 'Glowworm' attack.
Mitigation and Prevention
It is crucial to take immediate steps to address this vulnerability and implement long-term security practices to prevent future attacks.
Immediate Steps to Take
Users should cease using devices prone to the 'Glowworm' attack and explore alternative secure USB splitter options.
Long-Term Security Practices
Implement network segmentation, regularly update firmware, and avoid using vulnerable devices in critical environments to enhance overall security.
Patching and Updates
Stay informed about security patches released by TP-Link and promptly apply relevant updates to mitigate the risk associated with CVE-2021-38543.