Out-of-Bounds Memory Access in Linux Kernel's eBPF - CVE-2021-4204
Summary
CVE-2021-4204: An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for all other parts of the system. It manages hardware resources, system calls, and process scheduling. The eBPF (extended Berkeley Packet Filter) is a powerful feature of the Linux kernel that allows users to run sandboxed programs in response to various events without changing the kernel source code or loading kernel modules. However, vulnerabilities in eBPF can lead to severe security issues, including system crashes and information leaks.
Vulnerability Detail
CVE-2021-4204 is an out-of-bounds (OOB) memory access flaw found in the eBPF subsystem of the Linux kernel. This vulnerability arises from improper input validation, allowing a local attacker with special privileges to exploit the flaw. The potential ramifications include crashing the system or leaking sensitive internal information, which could compromise the integrity and confidentiality of the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, limit access to the eBPF features for unprivileged users until the system can be updated. This can be done by modifying user permissions or using security modules like AppArmor or SELinux to restrict access.
Conclusion
CVE-2021-4204 represents a significant vulnerability in the Linux kernel's eBPF that can lead to serious security issues if not addressed. Users are advised to update their systems promptly to mitigate the risks associated with this flaw.
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FAQ
CVE-2021-4204 is a vulnerability in the Linux kernel's eBPF that allows for out-of-bounds memory access due to improper input validation.
A local attacker with special privileges can exploit this vulnerability to crash the system or leak internal information.
The impacts include system crashes and the potential leakage of sensitive information, which can compromise system security.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
The CVSS score of CVE-2021-4204 is 7.1, indicating a high severity level.
References
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