CVE-2021-34145 : What You Need to Know
Learn about CVE-2021-34145, a vulnerability in the Bluetooth Classic implementation of Cypress WICED BT stack, allowing attackers to trigger denial of service via crafted LMP packets.
Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices has a vulnerability that allows attackers to trigger a denial of service via a crafted LMP packet.
Understanding CVE-2021-34145
This CVE describes a flaw in how Bluetooth Classic is implemented in certain devices, leading to a denial-of-service vulnerability that can be exploited by attackers within radio range.
What is CVE-2021-34145?
The Bluetooth Classic implementation in the Cypress WICED BT stack through version 2.9.0 for CYW20735B1 devices fails to handle certain packets properly, enabling attackers to crash the firmware through a crafted LMP packet.
The Impact of CVE-2021-34145
This vulnerability allows attackers within radio range to trigger a denial of service by sending a specially crafted LMP packet, resulting in a firmware crash.
Technical Details of CVE-2021-34145
This section delves into the specifics of the vulnerability, including the description, affected systems and versions, as well as the exploitation mechanism.
Vulnerability Description
The vulnerability arises from the improper handling of specific LMP packets after completion of the LMP setup procedure, leading to a firmware crash.
Affected Systems and Versions
The vulnerability affects the Cypress WICED BT stack through version 2.9.0 for CYW20735B1 devices.
Exploitation Mechanism
Attackers within radio range can exploit this vulnerability by sending a maliciously crafted LMP packet, targeting the device and causing a denial of service.
Mitigation and Prevention
Discover how to address and prevent this vulnerability to enhance the security of affected systems.
Immediate Steps to Take
To mitigate the risk, users are advised to apply patches provided by the vendor or implement alternative safeguards.
Long-Term Security Practices
Establish strict security protocols, educate users about potential threats, and regularly update systems to defend against similar vulnerabilities.
Patching and Updates
Stay informed about security updates and patches released by Cypress for the affected devices to protect against this vulnerability.