Audit Configuration Files Must Be Owned By Root

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Description

All audit configuration files must be owned by root user. To properly set the owner of /etc/audit/, run the command:

$ sudo chown root /etc/audit/

To properly set the owner of /etc/audit/rules.d/, run the command:

$ sudo chown root /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 dpkg-query --show --showformat='${db:Status-Status}
' 'kernel' 2>/dev/null | grep -q installed && dpkg-query --show --showformat='${db:Status-Status}\n' 'auditd' 2>/dev/null | grep -q installed; then

find -L /etc/audit/ -maxdepth 1 -type f ! -uid 0 -regextype posix-extended -regex '^.*audit(\.rules|d\.conf)$' -exec chown -L 0 {} \;

find -L /etc/audit/rules.d/ -maxdepth 1 -type f ! -uid 0 -regextype posix-extended -regex '^.*\.rules$' -exec chown -L 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:
  - DISA-STIG-UBTU-20-010134
  - configure_strategy
  - file_ownership_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 ! -uid 0 -regextype posix-extended
    -regex "^.*audit(\.rules|d\.conf)$"
  register: files_found
  changed_when: false
  failed_when: false
  check_mode: false
  when:
  - '"auditd" in ansible_facts.packages'
  - '"kernel" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010134
  - configure_strategy
  - file_ownership_audit_configuration
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure owner on /etc/audit/ file(s) matching ^.*audit(\.rules|d\.conf)$
  file:
    path: '{{ item }}'
    owner: '0'
    state: file
  with_items:
  - '{{ files_found.stdout_lines }}'
  when:
  - '"auditd" in ansible_facts.packages'
  - '"kernel" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010134
  - configure_strategy
  - file_ownership_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 ! -uid 0 -regextype posix-extended
    -regex "^.*\.rules$"
  register: files_found
  changed_when: false
  failed_when: false
  check_mode: false
  when:
  - '"auditd" in ansible_facts.packages'
  - '"kernel" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010134
  - configure_strategy
  - file_ownership_audit_configuration
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure owner on /etc/audit/rules.d/ file(s) matching ^.*\.rules$
  file:
    path: '{{ item }}'
    owner: '0'
    state: file
  with_items:
  - '{{ files_found.stdout_lines }}'
  when:
  - '"auditd" in ansible_facts.packages'
  - '"kernel" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010134
  - configure_strategy
  - file_ownership_audit_configuration
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed