Vulnerability in Kernel: Disallow Extremely Large seq Buffer Allocations
Summary
UVI-2021-1001261: seq_file: disallow extremely large seq buffer allocations. Affects Kernel versions >= 058504edd02667eef8fac9be27ab3ea74332e9b4, < 174c34d9cda1b5818419b8f5a332ced10755e52f. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question affects the Kernel's seq_file module, which is responsible for handling sequential file access. This module allows users to read data from files in a sequential manner. However, it has been discovered that the seq_file module allows for the allocation of extremely large seq buffers, which can lead to potential security vulnerabilities.
Vulnerability Detail
The vulnerability arises from the seq_file module's failure to restrict the allocation of excessively large seq buffers. An attacker could exploit this by allocating a large buffer, potentially causing a denial-of-service (DoS) condition or triggering a buffer overflow. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability has been fixed in Linux Kernel version v5.10.52 by commit 174c34d9cda1b5818419b8f5a332ced10755e52f. However, it was introduced in version v3.16 by commit 058504edd02667eef8fac9be27ab3ea74332e9b4.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
In conclusion, the vulnerability in the Kernel's seq_file module allows for the allocation of extremely large seq buffers, potentially leading to a denial-of-service (DoS) condition or a buffer overflow. It is crucial to update the Linux Kernel to version v5.10.52 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The seq_file module in the Kernel is responsible for handling sequential file access. It allows users to read data from files in a sequential manner, providing an interface for iterating over the contents of a file.
If exploited, this vulnerability could lead to a denial-of-service (DoS) condition or a buffer overflow. However, the actual impact and attack plausibility have not been proven yet.
You can use Vulert's playground (https://vulert.com/scanner) 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, this vulnerability has been fixed in Linux Kernel version v5.10.52 by commit 174c34d9cda1b5818419b8f5a332ced10755e52f.
To fix this vulnerability, you should update the Linux Kernel to version v5.10.52 or later. Obtain the latest stable version of the Kernel from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and follow the installation instructions provided.
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