netfilter: nf_tables: disallow non-stateful expression in sets earlier
Summary
GSD-2022-1003460: netfilter: nf_tables: disallow non-stateful expression in sets earlier. Affects Kernel versions >= 0b2d8a7b638b5034d2d68f6add8af94daaa1d4cd, < f692bcffd1f2ce5488d24fbcb8eab5f351abf79d. No fix is published. How to fix ↓
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Background
The Linux Kernel is an open-source monolithic Unix-like computer operating system kernel. It provides the core functionality for the Linux operating system. The netfilter subsystem in the Linux Kernel provides various network filtering and packet mangling capabilities. nf_tables is a component of netfilter that allows users to define firewall rules and perform packet filtering. This vulnerability in nf_tables allows non-stateful expressions to be used in sets, which can lead to potential security issues.
Vulnerability Detail
The vulnerability in nf_tables allows non-stateful expressions to be used in sets. This means that certain expressions that are not related to the state of a packet can be used in sets, potentially bypassing firewall rules and leading to security vulnerabilities. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in Linux Kernel version 4.1 and is fixed in version 5.15.45 by commit f692bcffd1f2ce5488d24fbcb8eab5f351abf79d.
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 vulnerability in nf_tables that allows non-stateful expressions in sets can potentially lead to security vulnerabilities. It is recommended to update the Linux Kernel to version 5.15.45 or later to fix this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
nf_tables is a component of the netfilter subsystem in the Linux Kernel that allows users to define firewall rules and perform packet filtering.
The impact of this vulnerability is not yet proven, but it could potentially allow bypassing of firewall rules and lead to security vulnerabilities.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. It analyzes your manifest file (e.g., package-lock.json) and alerts in real-time for open-source vulnerabilities.
Yes, the vulnerability is fixed in Linux Kernel version 5.15.45. It is recommended to update your Linux Kernel to this version or later.
You can find more information about this vulnerability in the GSD-2022-1003460 entry of the GSD database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2022/1003xxx/GSD-2022-1003460.json).
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