Verify Group Ownership of Message of the Day Banner

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Description

To properly set the group owner of /etc/motd, run the command:

$ sudo chgrp root /etc/motd

Rationale

Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance.

Proper group ownership will ensure that only root user can modify the banner.

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

if getent group "0" >/dev/null 2>&1; then
  newgroup="0"
fi
if [[ -z ${newgroup} ]]; then
  echo "0 is not a defined group on the system"
  exit 1
fi
chgrp $newgroup /etc/motd

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Set the file_groupowner_etc_motd_newgroup variable if represented by gid
  set_fact:
    file_groupowner_etc_motd_newgroup: '0'
  tags:
  - configure_strategy
  - file_groupowner_etc_motd
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Test for existence /etc/motd
  stat:
    path: /etc/motd
  register: file_exists
  tags:
  - configure_strategy
  - file_groupowner_etc_motd
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure group owner on /etc/motd
  file:
    path: /etc/motd
    group: '{{ file_groupowner_etc_motd_newgroup }}'
  when: file_exists.stat is defined and file_exists.stat.exists
  tags:
  - configure_strategy
  - file_groupowner_etc_motd
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed