CVE-2021-31615 : What You Need to Know
Discover the impact of CVE-2021-31615 on Bluetooth devices. Learn about the vulnerability allowing crafted packet injections and how to prevent MITM attacks.
Bluetooth Core Specifications versions 4.0 through 5.2 are impacted by a vulnerability that allows an adjacent device to inject crafted packets during the receive window, potentially leading to man-in-the-middle attacks.
Understanding CVE-2021-31615
This CVE involves unencrypted Bluetooth Low Energy baseband links, posing a threat to the confidentiality and integrity of communication.
What is CVE-2021-31615?
The vulnerability in Bluetooth Core Specifications 4.0 through 5.2 enables nearby devices to inject malicious packets during the listening device's receive window, achieving full Man-in-the-Middle (MITM) status without link termination.
The Impact of CVE-2021-31615
When targeted at encrypted links, the exploit could terminate an existing connection, although it does not compromise data confidentiality or integrity.
Technical Details of CVE-2021-31615
The cybersecurity flaw stems from unencrypted Bluetooth Low Energy baseband links within versions 4.0 to 5.2 of Bluetooth Core Specifications.
Vulnerability Description
Adversaries can insert carefully crafted packets into the listening device's receive window before the sender's transmission, gaining MITM control.
Affected Systems and Versions
Devices using Bluetooth Core Specifications 4.0 through 5.2 are susceptible to this exploitation, allowing attackers to intercept data.
Exploitation Mechanism
By injecting malicious packets during the communication exchange, threat actors can establish MITM attacks without disrupting the link.
Mitigation and Prevention
To address CVE-2021-31615, immediate actions and long-term security measures are crucial.
Immediate Steps to Take
Update devices to the latest Bluetooth specifications and implement encryption to mitigate the risk of unauthorized packet injections.
Long-Term Security Practices
Regularly monitor Bluetooth communications for suspicious activities, educate users about secure Bluetooth usage, and employ intrusion detection systems.
Patching and Updates
Stay informed about security patches released by Bluetooth device manufacturers and promptly apply updates to safeguard against potential vulnerabilities.