Vulnerability in Kernel: tcp_init_transfer() Resets icsk_ca_initialized
Summary
GSD-2021-1001255: tcp: fix tcp_init_transfer() to not reset icsk_ca_initialized. Affects Kernel versions >= 8919a9b31eb4fb4c0a93e5fb350a626924302aa6, < ad4ba3404931745a5977ad12db4f0c34080e52f7. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between processes, and handles device drivers. The vulnerability in question affects the Kernel's TCP implementation, specifically the tcp_init_transfer() function. This function incorrectly resets the icsk_ca_initialized flag, potentially leading to security issues.
Vulnerability Detail
The tcp_init_transfer() function in the Kernel's TCP implementation erroneously resets the icsk_ca_initialized flag. This flag is responsible for tracking the initialization status of the TCP congestion control algorithm. By resetting it, the function can disrupt the proper functioning of the congestion control mechanism, potentially leading to performance degradation or even security vulnerabilities. Attackers may exploit this vulnerability to manipulate the congestion control behavior, causing denial-of-service (DoS) attacks or bypassing network traffic restrictions.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply the patch manually to their existing Kernel version. The patch can be obtained from the commit ad4ba3404931745a5977ad12db4f0c34080e52f7 in the Linux Kernel repository. Users should carefully follow the instructions provided in the patch to ensure proper application.
Conclusion
The vulnerability in Kernel's tcp_init_transfer() function, which resets the icsk_ca_initialized flag, can have significant implications for system performance and security. It is crucial to update the Linux Kernel to version v5.10.53 or later to address this vulnerability. Alternatively, users can apply the provided patch manually. Regularly monitoring for vulnerabilities using tools like Vulert can help ensure the security of your software.
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FAQ
The vulnerability can lead to performance degradation, potential security vulnerabilities, and the possibility of DoS attacks or bypassing network traffic restrictions.
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 one.
At the time of this report, there are no known exploits for this vulnerability. However, it is crucial to apply the recommended fix or workaround to mitigate any potential risks.
Yes, this vulnerability can be exploited remotely. Attackers can manipulate the congestion control behavior, potentially leading to DoS attacks or bypassing network traffic restrictions.
For further support on vulnerability remediation or any related concerns, please contact info@devnack.com.
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