Vulnerability in Kernel: neighbour: allow NUD_NOARP entries to be forced GCed
Summary
UVI-2021-1000789: neighbour: allow NUD_NOARP entries to be forced GCed. Affects Kernel versions >= 58956317c8de52009d1a38a721474c24aef74fe7, < d17d47da59f726dc4c87caebda3a50333d7e2fd3. 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 acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the security and stability of the system. The vulnerability in question affects the neighbour subsystem of the Kernel. The neighbour subsystem is responsible for managing the neighbor cache, which stores information about neighboring devices on the network. This vulnerability allows NUD_NOARP entries in the neighbor cache to be forcibly garbage collected, potentially leading to unexpected behavior and security issues.
Vulnerability Detail
The vulnerability arises from a flaw in the neighbor subsystem that allows NUD_NOARP entries to be forcibly garbage collected. NUD_NOARP is a flag that indicates that the neighbor entry does not require Address Resolution Protocol (ARP) resolution. By exploiting this vulnerability, an attacker could manipulate the neighbor cache, leading to various security risks such as traffic interception, denial of service, or unauthorized access to network resources. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to ensure the integrity and security of the system.
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. However, as a general best practice, it is advisable to follow standard security measures such as implementing network segmentation, using firewalls, and regularly monitoring network activity to detect any suspicious behavior.
Conclusion
The vulnerability in the Kernel's neighbor subsystem, allowing NUD_NOARP entries to be forcibly garbage collected, poses potential security risks. To mitigate these risks, it is crucial to update the Linux Kernel to version v5.10.43 or later. Regularly monitoring for vulnerabilities using tools like Vulert can help ensure the security and integrity of the system. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The neighbor subsystem in the Kernel is responsible for managing the neighbor cache, which stores information about neighboring devices on the network. It helps in resolving IP addresses to link-layer addresses using protocols like Address Resolution Protocol (ARP).
The impact of this vulnerability can vary depending on the specific environment and configuration. However, potential risks include traffic interception, denial of service, and unauthorized access to network resources.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
Yes, a patch for this vulnerability is available in the Linux Kernel version v5.10.43 or later. It is recommended to update the Kernel to the latest version to fix the vulnerability.
As of now, there are no known exploits for this vulnerability. However, it is essential to address it promptly by updating the Kernel to the latest version to mitigate any potential risks.
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