Use-after-free vulnerability in net/tls package of Linux Kernel
Summary
GSD-2021-1000796: net/tls: Fix use-after-free after the TLS device goes down and up. Affects Kernel versions >= e8f69799810c32dd40c6724d829eccc70baad07f, < 0f1e6fe66977a864fe850522316f713d7b926fd9. 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 managing system resources, including networking capabilities. The net/tls package within the Linux Kernel is responsible for handling Transport Layer Security (TLS) connections, ensuring secure communication between network endpoints.
Vulnerability Detail
The net/tls package in the Linux Kernel is affected by a use-after-free vulnerability. This vulnerability occurs when the TLS device goes down and then comes back up, leading to a situation where memory is accessed after it has been freed. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service (DoS) condition. The vulnerability was introduced in version v4.18 of the Linux Kernel and has been fixed in version v5.12.10.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the net/tls package if it is not required for their specific use case. This can be achieved by modifying the kernel configuration to exclude the net/tls module during the build process. However, this workaround should only be considered if the TLS functionality is not essential for the system's operation.
Conclusion
The use-after-free vulnerability in the net/tls package of the Linux Kernel can have serious security implications, allowing attackers to execute arbitrary code or cause a denial-of-service condition. It is crucial to update the Linux Kernel to version v5.12.10 or later to mitigate this vulnerability. If you require further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
The use-after-free vulnerability in the net/tls package of the Linux Kernel can potentially allow an attacker to execute arbitrary code or cause a denial-of-service condition.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it for any open-source vulnerabilities, including this specific use-after-free issue.
Yes, the use-after-free vulnerability in the net/tls package has been fixed in Linux Kernel version v5.12.10. It is recommended to update to this version or a later one to mitigate the vulnerability.
Yes, as a workaround, you can disable the net/tls package if it is not required for your system. However, this should only be done if the TLS functionality is not essential for your system's operation.
The updated Linux Kernel with the fix for the use-after-free vulnerability in the net/tls package can be obtained from the official Linux Kernel repository.
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