Verify Group Who Owns /etc/shells File

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Description

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

$ sudo chgrp root /etc/shells

Rationale

The /etc/shells file contains the list of full pathnames to shells on the system. Since this file is used by many system programs this file should be protected.

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/shells

Ansible playbook

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

- name: Set the file_groupowner_etc_shells_newgroup variable if represented by gid
  set_fact:
    file_groupowner_etc_shells_newgroup: '0'
  tags:
  - NIST-800-53-AC-3
  - NIST-800-53-MP-2
  - configure_strategy
  - file_groupowner_etc_shells
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Test for existence /etc/shells
  stat:
    path: /etc/shells
  register: file_exists
  tags:
  - NIST-800-53-AC-3
  - NIST-800-53-MP-2
  - configure_strategy
  - file_groupowner_etc_shells
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure group owner on /etc/shells
  file:
    path: /etc/shells
    group: '{{ file_groupowner_etc_shells_newgroup }}'
  when: file_exists.stat is defined and file_exists.stat.exists
  tags:
  - NIST-800-53-AC-3
  - NIST-800-53-MP-2
  - configure_strategy
  - file_groupowner_etc_shells
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed