Audit Configuration Files Must Be Owned By Group root

Cette page n'est pas encore disponible en français, sa traduction est en cours.
Si vous avez des questions ou des retours sur notre projet de traduction actuel, n'hésitez pas à nous contacter.

Description

All audit configuration files must be owned by group root.

chown :root /etc/audit/audit*.{rules,conf} /etc/audit/rules.d/*

Rationale

Without the capability to restrict which roles and individuals can select which events are audited, unauthorized personnel may be able to prevent the auditing of critical events. Misconfigured audits may degrade the system’s performance by overwhelming the audit log. Misconfigured audits may also make it more difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Remediation

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 [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ] && dpkg-query --show --showformat='${db:Status-Status}\n' 'auditd' 2>/dev/null | grep -q installed; then

find /etc/audit/ -maxdepth 1 -type f ! -group 0 -regex '^audit(\.rules|d\.conf)$' -exec chgrp 0 {} \;

find /etc/audit/rules.d/ -maxdepth 1 -type f ! -group 0 -regex '^.*\.rules$' -exec chgrp 0 {} \;

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:
  - configure_strategy
  - file_groupownership_audit_configuration
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Find /etc/audit/ file(s) matching ^audit(\.rules|d\.conf)$
  command: find -H /etc/audit/ -maxdepth 1 -type f ! -group 0 -regex "^audit(\.rules|d\.conf)$"
  register: files_found
  changed_when: false
  failed_when: false
  check_mode: false
  when:
  - '"auditd" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - configure_strategy
  - file_groupownership_audit_configuration
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure group owner on /etc/audit/ file(s) matching ^audit(\.rules|d\.conf)$
  file:
    path: '{{ item }}'
    group: '0'
    state: file
  with_items:
  - '{{ files_found.stdout_lines }}'
  when:
  - '"auditd" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - configure_strategy
  - file_groupownership_audit_configuration
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Find /etc/audit/rules.d/ file(s) matching ^.*\.rules$
  command: find -H /etc/audit/rules.d/ -maxdepth 1 -type f ! -group 0 -regex "^.*\.rules$"
  register: files_found
  changed_when: false
  failed_when: false
  check_mode: false
  when:
  - '"auditd" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - configure_strategy
  - file_groupownership_audit_configuration
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure group owner on /etc/audit/rules.d/ file(s) matching ^.*\.rules$
  file:
    path: '{{ item }}'
    group: '0'
    state: file
  with_items:
  - '{{ files_found.stdout_lines }}'
  when:
  - '"auditd" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - configure_strategy
  - file_groupownership_audit_configuration
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed