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CIS Ubuntu 14.04 LTS - 1.6.1.1 Ensure SELinux is not disabled in bootloader configuration

DevOps & Security
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Verify that SELinux is not disabled via GRUB bootloader parameters

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_Linux_14.04_LTS_Benchmark_v2.1.0/cis-ubuntu1404-v210-1-6-1-1/SKILL.md

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1.6.1.1 Ensure SELinux is not disabled in bootloader configuration (Scored)

Profile Applicability

  • Level 2 - Server
  • Level 2 - Workstation

Description

Configure SELINUX to be enabled at boot time and verify that it has not been overwritten by the grub boot parameters.

Rationale

SELinux must be enabled at boot time in your grub configuration to ensure that the controls it provides are not overridden.

Audit Procedure

Run the following command and verify that no linux line has the selinux=0 or enforcing=0 parameters set:

grep "^\s*linux" /boot/grub/grub.cfg

Expected Result

No linux lines should contain selinux=0 or enforcing=0.

Remediation

Edit /etc/default/grub and remove all instances of selinux=0 and enforcing=0 from all CMDLINE_LINUX parameters:

GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX=""

Run the following command to update the grub2 configuration:

update-grub

Default Value

Not applicable.

Notes

This recommendation is designed around the grub bootloader, if LILO or another bootloader is in use in your environment enact equivalent settings.

References

  • CIS Controls: 14.4 Protect Information With Access Control Lists

Profile

  • Level 2 - Server
  • Level 2 - Workstation