Verify /boot/grub/grub.cfg Permissions
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Description
File permissions for /boot/grub/grub.cfg
should be set to 600.
To properly set the permissions of /boot/grub/grub.cfg
, run the command:
$ sudo chmod 600 /boot/grub/grub.cfg
Rationale
Proper permissions ensure that only the root user can modify important boot
parameters.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
# Remediation is applicable only in certain platforms
if [ ! -d /sys/firmware/efi ] && dpkg-query --show --showformat='${db:Status-Status}\n' 'grub2-common' 2>/dev/null | grep -q installed && { [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; }; then
chmod u-xs,g-xwrs,o-xwrt /boot/grub/grub.cfg
else
>&2 echo 'Remediation is not applicable, nothing was done'
fi
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Gather the package facts
package_facts:
manager: auto
tags:
- NIST-800-171-3.4.5
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_grub2_cfg
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Test for existence /boot/grub/grub.cfg
stat:
path: /boot/grub/grub.cfg
register: file_exists
when:
- '"/boot/efi" not in ansible_mounts | map(attribute="mount") | list'
- '"grub2-common" in ansible_facts.packages'
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- NIST-800-171-3.4.5
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_grub2_cfg
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure permission u-xs,g-xwrs,o-xwrt on /boot/grub/grub.cfg
file:
path: /boot/grub/grub.cfg
mode: u-xs,g-xwrs,o-xwrt
when:
- '"/boot/efi" not in ansible_mounts | map(attribute="mount") | list'
- '"grub2-common" in ansible_facts.packages'
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
- file_exists.stat is defined and file_exists.stat.exists
tags:
- NIST-800-171-3.4.5
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_grub2_cfg
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed