Use After Free Vulnerability in Kernel
Summary
GSD-2021-1001387: misc/libmasm/module: Fix two use after free in ibmasm_init_one. Affects Kernel versions < 481a76d4749ee3a27f902ba213fdcbb4bb39720e. 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 essential services and functions for the system's operation. It acts as a bridge between the hardware and software layers, managing resources, handling system calls, and ensuring security. The Kernel is responsible for managing memory, processes, and device drivers. It is a fundamental part of the Linux ecosystem and is widely used in various devices, including servers, desktops, and embedded systems. However, the Kernel is susceptible to vulnerabilities that can be exploited by attackers to gain unauthorized access or disrupt system operations.
Vulnerability Detail
The identified vulnerability, labeled GSD-2021-1001387, is a use-after-free vulnerability in the ibmasm_init_one function within the misc/libmasm/module of the Kernel. This vulnerability occurs when a program continues to use a pointer after the memory it points to has been freed. An attacker can potentially exploit this vulnerability to execute arbitrary code, escalate privileges, or cause a denial of service. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to ensure the security and stability of the system.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v4.19.198 or later. The fix for this vulnerability was implemented in commit 481a76d4749ee3a27f902ba213fdcbb4bb39720e. Updating the Kernel to the patched version will ensure that the use-after-free issue in the ibmasm_init_one function is resolved.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Kernel to the patched version.
Conclusion
The use-after-free vulnerability in the Kernel's ibmasm_init_one function poses a potential security risk. It is crucial to update the Kernel to the patched version (v4.19.198 or later) to mitigate this vulnerability. Failure to address this issue may result in unauthorized access, privilege escalation, or system disruption. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a pointer after the memory it points to has been freed. This can lead to various security issues, including the execution of arbitrary code or a denial of service.
The impact of this vulnerability is not yet proven, but it has the potential to allow attackers to execute arbitrary code, escalate privileges, or cause a denial of service.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. It analyzes the manifest file (e.g., package-lock.json) of your application and provides real-time alerts for open-source vulnerabilities.
There is no known exploit for this vulnerability at the moment. However, it is essential to apply the fix to prevent potential exploitation.
You can find more information about this vulnerability in the GSD-2021-1001387 JSON file available in the GSD database (https://github.com/cloudsecurityalliance/gsd-database).
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