UAF in tlan_remove_one in Kernel
Summary
UVI-2021-1001440: net: ti: fix UAF in tlan_remove_one. Affects Kernel versions >= 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa, < c263ae8c7e4c482387de5e6c89e213f8173fe8b6. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The tlan_remove_one function in the Kernel's network subsystem is responsible for removing a network device. However, a use-after-free (UAF) vulnerability has been discovered in tlan_remove_one, which could potentially lead to arbitrary code execution or a system crash.
Vulnerability Detail
The UAF vulnerability in tlan_remove_one arises from improper handling of network device removal. An attacker could exploit this flaw by triggering the removal of a network device while it is still in use, leading to a use-after-free condition. This could allow the attacker to execute arbitrary code with kernel privileges or cause a denial-of-service (DoS) condition. The vulnerability was introduced in version v3.10 of the Linux Kernel and has been fixed in version v4.9.277.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, as a general security measure, it is advisable to implement strict access controls and network segmentation to minimize the potential impact of a successful exploit. Regularly monitoring and updating the Kernel with security patches is also essential.
Conclusion
The UAF vulnerability in tlan_remove_one in the Kernel poses a significant security risk, potentially allowing an attacker to execute arbitrary code with kernel privileges or cause a system crash. It is crucial to update the Linux Kernel to version v4.9.277 or later to mitigate this vulnerability. Regularly monitoring for security updates and following best practices for secure system administration is essential. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The UAF vulnerability in tlan_remove_one could potentially allow an attacker to execute arbitrary code with kernel privileges or cause a system crash, leading to a denial-of-service condition.
You can use the Vulert Playground (https://vulert.com/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 UAF vulnerability in the Kernel.
There is no information available regarding active exploitation of this vulnerability in the wild. However, it is crucial to apply the necessary security updates to mitigate the risk.
The primary mitigation for this vulnerability is to update the Linux Kernel to version v4.9.277 or later. Additionally, implementing strict access controls, network segmentation, and regular security patching can help minimize the risk of exploitation.
For more information about this vulnerability, you can refer to the source link in the Cloud Security Alliance's GSD Database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/UVI-2021-1001440.json).
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