net: Only allow init netns to set default tcp cong to a restricted algo - Kernel
Summary
GSD-2021-1000341: net: Only allow init netns to set default tcp cong to a restricted algo. Affects Kernel versions >= 6670e152447732ba90626f36dfc015a13fbf150e, < 6c1ea8bee75df8fe2184a50fcd0f70bf82986f42. 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 provides an interface for applications to interact with the hardware. It is responsible for tasks such as process management, memory management, and device drivers. The vulnerability in question affects the networking subsystem of the Kernel, specifically the default TCP congestion control algorithm. This algorithm determines how the network congestion is handled and can impact the performance and stability of network connections.
Vulnerability Detail
The vulnerability allows only the initial network namespace (netns) to set the default TCP congestion control algorithm to a restricted option. This restriction prevents other network namespaces from modifying the default algorithm, which could potentially lead to insecure or inefficient network configurations. The impact of this vulnerability is dependent on the specific algorithm being used and the network environment. If an insecure or inefficient algorithm is set as the default, it could result in degraded network performance, increased vulnerability to network attacks, or other adverse effects. The vulnerability was introduced in Kernel version v4.15 and has been fixed in version v5.10.37.
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.
Conclusion
In conclusion, the net: Only allow init netns to set default tcp cong to a restricted algo vulnerability in the Kernel's networking subsystem can potentially lead to insecure or inefficient network configurations. It is recommended to update the Linux Kernel to version v5.10.37 or later to fix this vulnerability. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability depends on the specific TCP congestion control algorithm being used and the network environment. It could result in degraded network performance, increased vulnerability to network attacks, or other adverse effects.
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 one.
At the time of this report, there is no known exploit for this vulnerability. However, it is still important to apply the necessary updates to ensure the security and stability of your system.
No, this vulnerability restricts the ability to change the default TCP congestion control algorithm to only the initial network namespace (netns). Other network namespaces are prevented from modifying the default algorithm.
The primary solution to fix this vulnerability is to update the Linux Kernel to the latest version. However, if updating the Kernel is not feasible, you can consider implementing additional network security measures, such as using a firewall or intrusion detection system, to mitigate potential risks.
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