UAF in tlan_remove_one in Kernel
Summary
GSD-2021-1001376: net: ti: fix UAF in tlan_remove_one. Affects Kernel versions >= 1e0a8b13d35510e711fdf72e9a3e30bcb2bd49fa, < a0a817b2d308fac090a05cbbe80988e073ac5193. No fix is published. How to fix ↓
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Background
The Kernel is a crucial 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 this function, which could potentially lead to security breaches and system instability.
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 result in arbitrary code execution, denial of service, or privilege escalation. The vulnerability was introduced in version v3.10 of the Linux Kernel and has been fixed in version v4.19.199.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the affected network device or refrain from performing actions that trigger the removal of network devices. However, this workaround may impact network connectivity and functionality. It is strongly advised to apply the official fix by updating the Kernel.
Conclusion
The UAF vulnerability in tlan_remove_one in the Kernel can have severe security implications, potentially leading to arbitrary code execution, denial of service, or privilege escalation. It is crucial to update the Linux Kernel to version v4.19.199 or later to mitigate this vulnerability. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
The UAF vulnerability in tlan_remove_one could potentially allow attackers to execute arbitrary code, cause denial of service, or escalate privileges.
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 to the playground, and it will provide real-time alerts for open-source vulnerabilities.
At the time of this report, there is no known public exploit for this vulnerability. However, it is essential to apply the fix promptly to mitigate any potential risks.
While applying the official fix is the most effective way to address this vulnerability, it is also recommended to follow general security best practices. These include regularly updating software, implementing strong access controls, and using network security measures such as firewalls and intrusion detection systems.
For more detailed information about this vulnerability, including technical details and the fix commit, you can refer to the vulnerability database entry at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001376.json.
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