CVE-2021-34143 : Security Advisory and Response

Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 is vulnerable to a denial of service attack due to improper handling of continuous unsolicited LMP responses. Attackers in radio range can exploit this vulnerability to trigger a deadlock by flooding the device with specific packets, requiring user intervention to restart.

Understanding CVE-2021-34143

This section delves into the details of the CVE-2021-34143 vulnerability.

What is CVE-2021-34143?

The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 is susceptible to a denial of service attack initiated by flooding the device with specific packets, causing a deadlock that necessitates user intervention to resume normal device functionality.

The Impact of CVE-2021-34143

Exploiting this vulnerability allows attackers within radio range to disrupt the device's operation, leading to a denial of service condition that halts normal device functions until manual intervention is performed.

Technical Details of CVE-2021-34143

Here we explore the technical aspects of CVE-2021-34143 to understand the vulnerability better.

Vulnerability Description

The vulnerability arises from the inability of the Bluetooth Classic implementation in the Zhuhai Jieli AC6366C_DEMO_V1.0 to effectively manage continuous unsolicited LMP responses, enabling attackers to induce a device deadlock through flooding it with specific packets.

Affected Systems and Versions

The affected system is the Zhuhai Jieli AC6366C_DEMO_V1.0 due to its flawed Bluetooth Classic implementation. The specific affected version details are unavailable.

Exploitation Mechanism

Attackers in close radio proximity can exploit this vulnerability by inundating the device with LMP_AU_Rand packets post paging procedure, causing a denial of service condition and requiring manual intervention to reset the device.

Mitigation and Prevention

In this section, we outline steps to mitigate and prevent exploitation of CVE-2021-34143.

Immediate Steps to Take

To mitigate the risk associated with CVE-2021-34143, users are advised to stay updated on security bulletins, apply vendor-supplied patches promptly, and enforce strict access control measures limiting exposure to potential attackers.

Long-Term Security Practices

Implementing network segmentation, regularly updating firmware, and conducting security training for users can enhance the overall security posture to prevent and mitigate similar vulnerabilities in the future.

Patching and Updates

Vendor-provided patches addressing the vulnerability should be applied as soon as they are made available to protect devices from potential exploitation and disruption by malicious actors.