netfilter: nft_ct: skip expectations for confirmed conntrack in Kernel
Summary
GSD-2021-1000798: netfilter: nft_ct: skip expectations for confirmed conntrack. Affects Kernel versions >= 857b46027d6f91150797295752581b7155b9d0e1, < 2c0e6b35b88a961127066a1028bce9c727cbc3e5. 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 manages system resources. It includes various subsystems, such as netfilter, which is responsible for packet filtering and network address translation. The netfilter subsystem uses conntrack to track connections and apply firewall rules. However, a vulnerability has been discovered in the nft_ct module of netfilter, which can lead to unexpected behavior when handling confirmed conntrack connections.
Vulnerability Detail
The vulnerability in the nft_ct module of netfilter allows expectations to be skipped for confirmed conntrack connections. This can result in bypassing firewall rules and potentially allowing unauthorized access to the system. The issue was introduced in version v5.3 of the Linux Kernel and has been fixed in version v5.12.10. The impact and attack plausibility of this vulnerability have not been proven yet.
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 vulnerability in the nft_ct module can lead to unexpected behavior and potential unauthorized access to the system. It is crucial to update the Linux Kernel to the fixed version to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The netfilter subsystem is responsible for packet filtering, network address translation, and other network-related operations in the Linux Kernel.
Conntrack is a component of netfilter that tracks connections and allows the application of firewall rules based on connection state.
The exact exploitation method for this vulnerability is not provided. However, it could potentially be exploited by an attacker to bypass firewall rules and gain unauthorized access to a system.
There is no information available regarding active exploitation of this vulnerability in the wild.
Updating the Kernel to the fixed version is the recommended mitigation for this vulnerability. Regularly applying security patches and following best practices for system hardening can also help mitigate potential risks.
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