cis-ubuntu1804-v220-1-6-1-2

name	cis-ubuntu1804-v220-1-6-1-2
description	Ensure AppArmor is enabled in the bootloader configuration
category	cis-iam
version	2.2.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-18.04","apparmor","bootloader","grub"]
cis_id	1.6.1.2
cis_benchmark	CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

1.6.1.2 Ensure AppArmor is enabled in the bootloader configuration (Automated)

Profile Applicability

• Level 1 - Server
• Level 1 - Workstation

Description

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

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

Rationale

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

Audit Procedure

Command Line

Run the following commands to verify that all linux lines have the apparmor=1 and security=apparmor parameters set:

grep "^\s*linux" /boot/grub/grub.cfg | grep -v "apparmor=1"

Nothing should be returned.

grep "^\s*linux" /boot/grub/grub.cfg | grep -v "security=apparmor"

Nothing should be returned.

Expected Result

Nothing should be returned for both commands.

Remediation

Command Line

Edit /etc/default/grub and add the apparmor=1 and security=apparmor parameters to the GRUB_CMDLINE_LINUX= line:

GRUB_CMDLINE_LINUX="apparmor=1 security=apparmor"

Run the following command to update the grub2 configuration:

update-grub

References

1. NIST SP 800-53 Rev. 5: AC-3

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control Lists	X	X	X
v7	14.6 Protect Information through Access Control Lists	X	X	X

MITRE ATT&CK Mappings