SELinux Lockdown Permission Checks Vulnerability in Kernel
Summary
GSD-2021-1000799: bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks. Affects Kernel versions >= 59438b46471ae6cdfb761afc8c9beaf1e428a331, < acc43fc6cf0d50612193813c5906a1ab9d433e1e. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and provides an interface for applications to interact with the hardware. It is responsible for tasks such as process management, memory management, and device drivers. SELinux (Security-Enhanced Linux) is a security framework implemented in the Linux Kernel that provides access control and mandatory access control (MAC) security policies. It enforces fine-grained permissions on processes and files based on security labels.
This vulnerability in the Kernel's SELinux lockdown permission checks can potentially be exploited by attackers to bypass security restrictions and gain unauthorized access to sensitive resources. The vulnerability was introduced in version v5.6 of the Kernel and was fixed in version v5.12.10.
Vulnerability Detail
The vulnerability arises from buggy SELinux lockdown permission checks in the Kernel's bpf (Berkeley Packet Filter), lockdown, and audit subsystems. These permission checks are intended to enforce security restrictions and prevent unauthorized access to sensitive resources. However, due to the bug, these checks may not function as intended, allowing attackers to bypass the lockdown restrictions.
The impact of this vulnerability could be significant, as it may enable attackers to escalate privileges, execute arbitrary code, or access sensitive information. Successful exploitation of this vulnerability could compromise the integrity, confidentiality, and availability of the affected system.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
The SELinux lockdown permission checks vulnerability in the Linux Kernel can allow attackers to bypass security restrictions and gain unauthorized access to sensitive resources. It is crucial to update the Kernel to version v5.12.10 or later to fix this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability could allow attackers to bypass security restrictions and gain unauthorized access to sensitive resources. It may lead to privilege escalation, arbitrary code execution, or unauthorized access to sensitive information.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it for any open-source vulnerabilities, including this SELinux lockdown permission checks vulnerability.
At the moment, there is no known workaround for this vulnerability. It is recommended to update the Linux Kernel to the latest version to ensure the fix is applied.
The vulnerability was introduced in version v5.6 of the Linux Kernel and was fixed in version v5.12.10. Therefore, any version between v5.6 and v5.12.9 is potentially affected.
As of now, there are no known exploits for this vulnerability. However, it is crucial to apply the necessary updates and patches to mitigate the risk of exploitation.
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