netfilter: conntrack: Make global sysctls readonly in non-init netns
Summary
GSD-2021-1000129: netfilter: conntrack: Make global sysctls readonly in non-init netns. Affects Kernel versions >= d0febd81ae77a0e13717f1412ff9589e43fc4f8b, < fbf85a34ce17c4cf0a37ee253f4c582bbfb8231b. No fix is published. How to fix ↓
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Background
The Kernel package is a fundamental component of the Linux operating system. It provides the core functionality and interfaces for the system. The netfilter subsystem within the Kernel is responsible for packet filtering and network address translation. The conntrack module in netfilter keeps track of network connections and their states. This vulnerability affects the conntrack module in non-init netns, which refers to non-initial network namespaces. These namespaces allow for the creation of multiple isolated network environments within a single Linux system.
Vulnerability Detail
The vulnerability in the conntrack module allows unauthorized modification of global sysctls (system control variables) in non-init netns. This can lead to potential security risks as it allows an attacker to manipulate critical system settings and potentially disrupt network connections or gain unauthorized access. The vulnerability was introduced in version v5.7 of the Linux Kernel and has been fixed in version v5.11.19.
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
The netfilter conntrack vulnerability in non-init netns poses a potential security risk by allowing unauthorized modification of global sysctls. It is crucial to update the Linux Kernel to version v5.11.19 or later to fix this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability allows unauthorized modification of global sysctls in non-init netns, which can lead to potential security risks and system instability.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your application 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.
Yes, a patch has been released in version v5.11.19 of the Linux Kernel. It is recommended to update to this version or later to fix the vulnerability.
The exact attack vector and exploitability of this vulnerability have not been proven yet. However, unauthorized modification of critical system settings can potentially lead to remote exploitation or unauthorized access.
There are no known instances of this vulnerability being exploited in the wild. However, it is important to apply the patch and update the Kernel to mitigate any potential risks.
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