NFS: Potential NULL Dereference in nfs_get_client() in Kernel
Summary
GSD-2021-1000848: NFS: Fix a potential NULL dereference in nfs_get_client(). Affects Kernel versions >= 31434f496abb9f3410b10f541462fe58613dd3ad, < a979e601000982a3ca693171a6d4dffc47f8ad00. 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 a bridge between hardware and software. It manages system resources, facilitates communication between different software components, and enables the execution of user programs. The NFS (Network File System) is a distributed file system protocol that allows remote file access over a network. It is commonly used in Linux environments to share files and directories between systems.
The vulnerability in question, identified as GSD-2021-1000848, affects the Kernel's NFS implementation. Specifically, it involves a potential NULL dereference in the nfs_get_client() function. This vulnerability could lead to a system crash or potentially be exploited by an attacker to execute arbitrary code or escalate privileges.
Vulnerability Detail
The vulnerability arises from a potential NULL dereference in the nfs_get_client() function within the Kernel's NFS implementation. A NULL dereference occurs when a program attempts to access or manipulate a memory location that has a NULL (invalid) pointer value. In this case, if the nfs_get_client() function encounters a NULL pointer, it may lead to a system crash or enable an attacker to exploit the vulnerability.
The impact and attack plausibility of this vulnerability have not been proven, but it is essential to address it to ensure the stability and security of the system.
The vulnerability was introduced in version v3.17 of the Linux Kernel by commit 31434f496abb9f3410b10f541462fe58613dd3ad. It has been fixed in version v4.9.273 by commit a979e601000982a3ca693171a6d4dffc47f8ad00.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, if updating the Kernel is not immediately feasible, it is recommended to disable NFS functionality or restrict access to NFS services. This can be achieved by modifying the system configuration files to prevent the loading of NFS modules or by configuring firewall rules to block NFS-related network traffic.
Please note that applying workarounds may impact the availability or functionality of NFS services, and updating the Kernel remains the recommended long-term solution.
Conclusion
The vulnerability in the Kernel's NFS implementation, identified as GSD-2021-1000848, poses a potential risk of NULL dereference in the nfs_get_client() function. It is crucial to address this vulnerability by updating the Kernel to version v4.9.273 or later. Applying the recommended fix ensures system stability and security. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that provides core functionality and acts as a bridge between hardware and software.
NFS (Network File System) is a distributed file system protocol that allows remote file access over a network.
A NULL dereference occurs when a program attempts to access or manipulate a memory location that has a NULL (invalid) pointer value.
The potential consequences of this vulnerability include system crashes, arbitrary code execution, or privilege escalation.
To fix this vulnerability, update the Linux Kernel to version v4.9.273 or later.
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