CVE-2021-34146 Explained : Impact and Mitigation

A vulnerability has been identified in the Bluetooth Classic implementation in the Cypress CYW920735Q60EVB that could allow attackers to trigger a denial of service and crash the device. Learn about the impact, technical details, and mitigation steps associated with CVE-2021-34146.

Understanding CVE-2021-34146

This section provides an overview of the vulnerability identified as CVE-2021-34146 in the Bluetooth Classic implementation in the Cypress CYW920735Q60EVB.

What is CVE-2021-34146?

The vulnerability in the Cypress CYW920735Q60EVB allows attackers in radio range to initiate a denial of service attack and crash the device by flooding it with LMP_AU_Rand packets after the paging procedure.

The Impact of CVE-2021-34146

The impact of this vulnerability is significant as it exposes devices to potential denial of service attacks, leading to device crashes and disruptions in normal operation.

Technical Details of CVE-2021-34146

In this section, we delve into the technical aspects of CVE-2021-34146, including vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from the Bluetooth Classic implementation in the Cypress CYW920735Q60EVB's inability to handle continuous unsolicited LMP responses effectively, allowing attackers to exploit this weakness.

Affected Systems and Versions

The affected system is the Cypress CYW920735Q60EVB with no specific product or version details provided.

Exploitation Mechanism

Attackers within radio range can exploit the vulnerability by flooding the device with LMP_AU_Rand packets after the paging procedure, triggering a denial of service and device crash.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent the exploitation of CVE-2021-34146, covering immediate actions and long-term security practices.

Immediate Steps to Take

To mitigate the risk associated with CVE-2021-34146, users are advised to implement filtering mechanisms to block malicious LMP_AU_Rand packets and closely monitor Bluetooth activity for any anomalous behavior.

Long-Term Security Practices

In the long term, organizations should prioritize regular security assessments, implement firmware updates, and enforce best practices for Bluetooth security to safeguard against similar vulnerabilities.

Patching and Updates

It is crucial to stay informed about security patches released by Cypress for the CYW920735Q60EVB to address the vulnerability and enhance device security.