Bluetooth Vulnerability in Linux Kernel
Summary
GSD-2022-1003102: Bluetooth: use hdev lock for accept_list and reject_list in conn req. Affects Kernel versions >= a55bd29d522729e0cb125474396acdc2a107d4d9, < e534e5cf50f04099e5810bc1d26968603fc69baf. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for the hardware, software, and security of the system. Bluetooth is a wireless technology commonly used for short-range communication between devices. It allows for the transfer of data and the establishment of connections. However, a vulnerability has been discovered in the Linux Kernel's Bluetooth implementation.
Vulnerability Detail
The vulnerability in the Linux Kernel's Bluetooth implementation involves the handling of connection requests. Specifically, the accept_list and reject_list, which are used to manage incoming connection requests, are not properly protected by the hdev lock. This can lead to potential security issues, although the exact impact and attack plausibility have not been proven. The vulnerability was introduced in version v3.17 of the Linux Kernel and has been fixed in version v5.17.14 by commit e534e5cf50f04099e5810bc1d26968603fc69baf.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Linux Kernel is not immediately feasible, a possible workaround is to implement additional access controls or restrictions on the accept_list and reject_list in the Bluetooth implementation. This can help mitigate the risk of unauthorized connection requests. However, it is important to note that workarounds may not provide the same level of security as the official fix and should be considered temporary measures until the kernel can be updated.
Conclusion
In conclusion, a vulnerability has been discovered in the Linux Kernel's Bluetooth implementation that could potentially lead to security issues. It is crucial to update the kernel to the latest version to mitigate the risk. If immediate updating is not possible, implementing temporary workarounds can provide some level of protection. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The exact impact of this vulnerability is not yet proven. However, it could potentially lead to security issues and unauthorized access through Bluetooth connection requests.
You can use tools like Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground and it will provide real-time alerts for open-source vulnerabilities.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the necessary updates and security patches to mitigate the risk.
Yes, you can implement additional access controls or restrictions on the accept_list and reject_list in the Bluetooth implementation as a temporary workaround. However, it is recommended to update the kernel as soon as possible.
You can refer to the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) for more details about the fix and the vulnerability. Additionally, the vulnerability details can be found in the GSD-2022-1003102.json file in the GSD database (https://github.com/cloudsecurityalliance/gsd-database).
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