Vulnerability in Kernel: tcp_init_transfer() Resets icsk_ca_initialized
Summary
GSD-2021-1001153: tcp: fix tcp_init_transfer() to not reset icsk_ca_initialized. Affects Kernel versions >= 8919a9b31eb4fb4c0a93e5fb350a626924302aa6, < fe77b85828ca9ddc42977b79de9e40d18545b4fe. 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 core functionality and interfaces with hardware devices. It manages system resources, facilitates communication between software and hardware, and enables the execution of user programs. The tcp_init_transfer() function is part of the TCP (Transmission Control Protocol) implementation in the Kernel. It is responsible for initializing TCP connection parameters during a transfer. However, a vulnerability exists in this function that causes the icsk_ca_initialized flag to be reset, potentially leading to incorrect behavior and security issues.
Vulnerability Detail
The vulnerability in tcp_init_transfer() occurs when the function resets the icsk_ca_initialized flag. This flag is used to indicate whether the TCP congestion control algorithm has been initialized for a connection. By resetting this flag, the Kernel may incorrectly reinitialize the congestion control algorithm, leading to performance degradation, instability, or even potential security vulnerabilities. An attacker could potentially exploit this vulnerability to manipulate the congestion control behavior and disrupt network communications or launch more sophisticated attacks.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply a patch or backport the fix to their current Kernel version. Alternatively, they can disable the TCP congestion control algorithm initialization by modifying the Kernel configuration. However, these workarounds may not provide a comprehensive solution and are not recommended as a long-term strategy.
Conclusion
The vulnerability in tcp_init_transfer() within the Kernel can lead to performance issues, instability, and potential security risks. It is crucial to update the Linux Kernel to version v5.13.5 or later to fix this vulnerability. Applying the recommended fix ensures that the icsk_ca_initialized flag is not reset, preventing any associated issues. Users can also utilize Vulert's playground at https://vulert.com/scanner to check if their system is affected by this vulnerability. For more information and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to performance degradation, instability, and potential security vulnerabilities. It may allow attackers to manipulate the congestion control behavior and disrupt network communications or launch more sophisticated attacks.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
At the time of this report, there is no known public exploit for this vulnerability. However, it is important to apply the recommended fix to mitigate any potential risks.
This vulnerability is specific to the Linux Kernel and does not have any additional dependencies or prerequisites.
You can find more information about this vulnerability in the official Linux Kernel repository and the Cloud Security Alliance's GSD database. Additionally, you can reach out to info@devnack.com for further support on vulnerability remediation.
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