Integer Overflow Vulnerability in NFSD on 32-bit Systems
Summary
GSD-2022-1001928: NFSD: prevent integer overflow on 32 bit systems. Affects Kernel versions < 303cd6173dce0a28d26526c77814eb90a41bd898. No fix is published. How to fix ↓
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Background
The NFSD (Network File System Daemon) is a component of the Linux Kernel that allows remote clients to access files over a network. It provides file sharing services using the NFS (Network File System) protocol. NFSD is a critical part of the Linux operating system and is responsible for handling file operations for NFS clients.
This vulnerability affects NFSD on 32-bit systems, where an integer overflow can occur. An attacker could exploit this vulnerability to execute arbitrary code or cause a denial of service by triggering the overflow.
Vulnerability Detail
The vulnerability in NFSD on 32-bit systems is due to an integer overflow. When certain calculations involving integers are performed, the result can exceed the maximum value that can be represented by a 32-bit integer. This overflow can lead to unexpected behavior and potentially allow an attacker to execute arbitrary code or cause a denial of service.
The impact of this vulnerability depends on the specific use case and configuration of the affected system. However, in general, successful exploitation of this vulnerability could result in unauthorized access to sensitive data, system compromise, or disruption of NFS services.
The vulnerability has been fixed in Linux Kernel version v5.15.33 by commit 303cd6173dce0a28d26526c77814eb90a41bd898.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Linux Kernel is not immediately feasible, a possible workaround is to disable the NFSD service on the affected system. This can be done by stopping the NFSD daemon and preventing it from starting automatically on system boot.
Here are the steps to disable NFSD:
- Stop the NFSD daemon: $
sudo systemctl stop nfs-kernel-server
- Disable automatic start on system boot: $
sudo systemctl disable nfs-kernel-server
Please note that disabling NFSD will prevent NFS clients from accessing files on the affected system until the vulnerability is fixed.
Conclusion
The integer overflow vulnerability in NFSD on 32-bit systems can lead to arbitrary code execution or denial of service. It is crucial to update the Linux Kernel to version v5.15.33 or later to fix this vulnerability. If immediate kernel update is not possible, disabling the NFSD service can serve as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
NFSD (Network File System Daemon) is a component of the Linux Kernel that provides file sharing services using the NFS (Network File System) protocol. It allows remote clients to access files over a network.
The impact of this vulnerability depends on the specific use case and configuration of the affected system. However, in general, successful exploitation could result in unauthorized access to sensitive data, system compromise, or disruption of NFS services.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.15.33 or later. Alternatively, you can disable the NFSD service on the affected system as a temporary workaround.
While applying the workaround to disable NFSD can mitigate the vulnerability temporarily, it is strongly recommended to update the Linux Kernel to the fixed version as soon as possible.
More information about the vulnerability fix can be found in the Linux Kernel repository. The specific commit that addresses this vulnerability is 303cd6173dce0a28d26526c77814eb90a41bd898.
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