Vulnerability in Kernel: bpf: Fix masking negation logic upon negative dst register
Summary
GSD-2021-1000185: bpf: Fix masking negation logic upon negative dst register. Affects Kernel versions >= f92a819b4cbef8c9527d9797110544b2055a4b96, < 0e2dfdc74a7f4036127356d42ea59388f153f42c. 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 BPF (Berkeley Packet Filter) subsystem, which is responsible for packet filtering and network monitoring. BPF programs are executed in a restricted virtual machine within the Kernel and can be used for various purposes, including network traffic analysis and security filtering.
Vulnerability Detail
The vulnerability arises from a flaw in the masking negation logic when dealing with a negative destination (dst) register in BPF programs. This flaw can potentially lead to incorrect program behavior and security issues. An attacker could exploit this vulnerability to manipulate BPF programs and bypass security filters, potentially compromising the integrity and confidentiality of the system. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
The vulnerability in the Kernel's BPF subsystem could potentially allow attackers to manipulate BPF programs and bypass security filters. It is crucial for users to update their Kernel to the latest version (v4.19.190 or later) to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven. However, it has the potential to allow attackers to manipulate BPF programs and bypass security filters, potentially compromising system integrity and confidentiality.
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, without requiring access to the code or installation.
No known exploits for this vulnerability have been reported at the moment.
Yes, a patch has been released in the Linux Kernel version v4.19.190. Users are advised to update their Kernel to the latest version to mitigate the vulnerability.
You can find more information about this vulnerability in the GSD-2021-1000185 JSON report available at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000185.json.
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