Misconfigured SELinux
TLDR: Misconfigured SELinux (Security-Enhanced Linux) occurs when access control policies and security settings are improperly implemented, leading to vulnerabilities such as unauthorized access, compromised system integrity, or overly restrictive environments causing operational disruptions. Common issues include improper policy modes, misaligned contexts, and disabled enforcement. Proper configuration ensures robust access control and security in Linux systems.
https://en.wikipedia.org/wiki/Security-Enhanced_Linux
A misconfigured SELinux setup might involve setting the mode to `permissive` or `disabled`, which significantly reduces its ability to enforce security policies. Assigning incorrect security contexts to files or processes can result in unauthorized access or applications failing to function correctly. Additionally, failing to align SELinux policies with specific workloads or leaving logs unmonitored can lead to missed threats or inefficiencies in resolving access control issues. Tools like `getenforce`, `setenforce`, and `semanage` help configure and troubleshoot SELinux policies.
https://linux.die.net/man/8/setenforce
To secure SELinux, administrators should ensure it operates in `enforcing` mode to fully apply security policies, align security contexts with application and file requirements, and regularly review logs for denied actions. Using targeted policies rather than the default settings provides fine-grained control over system behavior. Adhering to security frameworks like CIS Benchmarks ensures that SELinux configurations align with best practices, enhancing both security and operational stability in Linux environments.