CVE-2021-31785 : What You Need to Know

Bluetooth Classic implementation on Actions ATS2815 and ATS2819 chipsets has a vulnerability that allows attackers to trigger a denial of service by sending crafted packets.

Understanding CVE-2021-31785

This CVE involves a vulnerability in the Bluetooth Classic implementation on Actions ATS2815 and ATS2819 chipsets, allowing attackers to execute a denial of service attack through specially crafted packets.

What is CVE-2021-31785?

The vulnerability in the Bluetooth Classic implementation on Actions ATS2815 and ATS2819 chipsets permits attackers within radio range to cause a deadlock in the device by sending multiple LMP_host_connection_req packets.

The Impact of CVE-2021-31785

Attackers can exploit this vulnerability to trigger a denial of service (deadlock) on the device, requiring manual user intervention to restart the affected device and restore Bluetooth communication.

Technical Details of CVE-2021-31785

This section provides more insights into the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from the improper handling of multiple LMP_host_connection_req packets in the Bluetooth Classic implementation on Actions ATS2815 and ATS2819 chipsets, enabling attackers to initiate a denial of service attack.

Affected Systems and Versions

The issue affects devices utilizing Actions ATS2815 and ATS2819 chipsets, making them susceptible to the denial of service attack through the exploitation of Bluetooth Classic.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted LMP packets within the radio range of the target device, leading to a deadlock situation that halts Bluetooth communication.

Mitigation and Prevention

Here are some steps to mitigate the risks associated with CVE-2021-31785 and enhance the security of affected systems.

Immediate Steps to Take

Users are advised to apply vendor patches promptly, disable Bluetooth when not in use, and avoid connecting to untrusted networks to reduce the risk of exploitation.

Long-Term Security Practices

Implementing security best practices such as regular software updates, security awareness training, and network segmentation can enhance the overall security posture and resilience against potential threats.

Patching and Updates

Ensure that the latest firmware or software updates provided by the chipset vendor are installed on the affected devices to address the vulnerability and prevent potential attacks.