Vulnerability in Kernel: proc/vmcore - Clearing User Buffer
Summary
GSD-2021-1002409: proc/vmcore: fix clearing user buffer by properly using clear_user(). Affects Kernel versions >= 997c136f518c5debd63847e78e2a8694f56dcf90, < 9ef384ed300d1bcfb23d0ab0b487d544444d4b52. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides essential services and functions for the system's operation. It acts as a bridge between the hardware and software layers, managing resources, handling system calls, and ensuring security. The proc/vmcore module is responsible for providing access to the system's core dump, which contains valuable information for debugging purposes. However, a vulnerability has been identified in the way user buffers are cleared in proc/vmcore, potentially leading to security issues.
Vulnerability Detail
The vulnerability in proc/vmcore arises from improper usage of the clear_user() function, which is responsible for clearing user buffers. Due to this flaw, an attacker may be able to access sensitive information present in the user buffer, leading to potential data leaks or unauthorized access. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability was introduced in version v3.0 of the Linux Kernel and has been fixed in version v4.19.219.
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. It is advised to follow the recommended fix and update the Linux Kernel to the latest version.
Conclusion
In conclusion, the vulnerability in Kernel's proc/vmcore module, which involves the improper clearing of user buffers, can potentially lead to data leaks and unauthorized access. It is crucial to update the Linux Kernel to version v4.19.219 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability could potentially lead to data leaks or unauthorized access to sensitive information present in the user buffer.
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 to the playground, and it will provide real-time monitoring and alerts for open-source vulnerabilities, including this one.
As of now, there is no known exploit for this vulnerability. However, it is crucial to apply the recommended fix and update the Linux Kernel to mitigate any potential risks.
The remote exploitability of this vulnerability has not been determined yet. However, it is always recommended to keep the system up to date with the latest security patches to minimize the risk of remote exploitation.
The recommended solution is to update the Linux Kernel to the latest version. This ensures that the necessary patch for addressing the vulnerability is applied. It is not advisable to rely on alternative solutions that may not provide comprehensive protection.
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