SELinux Lockdown Permission Check Bypass in Linux Kernel
Summary
GSD-2021-1000768: bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks. Affects Kernel versions >= 59438b46471ae6cdfb761afc8c9beaf1e428a331, < ff5039ec75c83d2ed5b781dc7733420ee8c985fc. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system. It provides essential functionality and interfaces for various hardware devices, system services, and user applications. SELinux (Security-Enhanced Linux) is a security mechanism implemented in the Linux Kernel that provides access control and mandatory access control (MAC) policies. It enhances the security of the system by enforcing fine-grained permissions and restrictions on processes and resources. The vulnerability described here affects the SELinux lockdown permission checks in the Linux Kernel.
Vulnerability Detail
The vulnerability in the SELinux lockdown permission checks allows bypassing the intended security restrictions. This vulnerability was introduced in version v5.6 of the Linux Kernel and fixed in version v5.10.43. Attackers can exploit this vulnerability to bypass SELinux lockdown permissions and gain unauthorized access to sensitive resources or perform unauthorized actions. 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
There is no specific workaround mentioned for this vulnerability.
Conclusion
The SELinux lockdown permission check bypass vulnerability in the Linux Kernel can potentially lead to unauthorized access and actions. It is crucial to update the Kernel to version v5.10.43 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
SELinux (Security-Enhanced Linux) is a security mechanism implemented in the Linux Kernel that provides access control and mandatory access control (MAC) policies. It enhances the security of the system by enforcing fine-grained permissions and restrictions on processes and resources.
The impact of this vulnerability is the potential bypassing of SELinux lockdown permissions, which can lead to unauthorized access to sensitive resources or unauthorized actions.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
Yes, a patch is available in the Linux Kernel version v5.10.43. It is recommended to update to this version or a later version to fix the vulnerability.
You can find more information about this vulnerability in the GSD-2021-1000768 JSON report at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000768.json
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