ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook in Kernel
Summary
GSD-2021-1000450: ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook. Affects Kernel versions >= 1879445dfa7bbd6fe21b09c5cc72f4934798afed, < a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that acts as a bridge between the hardware and software layers. It provides essential functionalities and services to enable the proper functioning of the system. The Kernel is responsible for managing system resources, handling device drivers, and facilitating communication between different software components. This vulnerability affects the Kernel's hw_breakpoint module, which is responsible for handling hardware breakpoints. Hardware breakpoints allow developers to set breakpoints in code execution to aid in debugging and analysis. However, a flaw in the implementation of the event's overflow_handler hook in the hw_breakpoint module can lead to potential security vulnerabilities.
Vulnerability Detail
The vulnerability arises from a direct check of the event's overflow_handler hook in the hw_breakpoint module. This check can be exploited by an attacker to execute arbitrary code or trigger a denial-of-service condition. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in version v4.7 of the Linux Kernel and has been fixed in version v4.19.191 by commit a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb. It is important to update to the fixed version to mitigate the risk associated with this vulnerability.
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.
Conclusion
The ARM: 9064/1: hw_breakpoint vulnerability in the Kernel's hw_breakpoint module can potentially lead to security risks. It is crucial to update the Linux Kernel to version v4.19.191 or later to mitigate these risks. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven. However, if successfully exploited, an attacker could execute arbitrary code or cause a denial-of-service condition.
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, a patch has been released to fix this vulnerability. It is recommended to update the Linux Kernel to version v4.19.191 or later.
The recommended approach is to update the Kernel to the fixed version. However, if updating is not immediately feasible, you can consider implementing additional security measures such as network segmentation, access controls, and intrusion detection systems to reduce the risk.
You can find more information about this vulnerability in the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and the vulnerability database maintained by the Cloud Security Alliance (https://github.com/cloudsecurityalliance/gsd-database).
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