Audit Configuration Files Must Be Owned By Group root
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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.
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='${db:Status-Status}\n' 'auditd' 2>/dev/null | grep -q installed; then
find /etc/audit/ -maxdepth 1 -L -type f ! -group 0 -regextype posix-extended -regex '^.*audit(\.rules|d\.conf)$' -exec chgrp -L 0 {} \;
find /etc/audit/rules.d/ -maxdepth 1 -L -type f ! -group 0 -regextype posix-extended -regex '^.*\.rules$' -exec chgrp -L 0 {} \;
else
>&2 echo 'Remediation is not applicable, nothing was done'
fi
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Gather the package facts
package_facts:
manager: auto
tags:
- DISA-STIG-UBTU-20-010135
- configure_strategy
- file_groupownership_audit_configuration
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Find /etc/audit/ file(s) matching ^.*audit(\.rules|d\.conf)$
command: find -H /etc/audit/ -maxdepth 1 -type f ! -group 0 -regextype posix-extended
-regex "^.*audit(\.rules|d\.conf)$"
register: files_found
changed_when: false
failed_when: false
check_mode: false
when:
- '"auditd" in ansible_facts.packages'
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- DISA-STIG-UBTU-20-010135
- configure_strategy
- file_groupownership_audit_configuration
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure group owner on /etc/audit/ file(s) matching ^.*audit(\.rules|d\.conf)$
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:
- DISA-STIG-UBTU-20-010135
- 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 -regextype posix-extended
-regex "^.*\.rules$"
register: files_found
changed_when: false
failed_when: false
check_mode: false
when:
- '"auditd" in ansible_facts.packages'
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- DISA-STIG-UBTU-20-010135
- configure_strategy
- file_groupownership_audit_configuration
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure group owner on /etc/audit/rules.d/ file(s) matching ^.*\.rules$
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:
- DISA-STIG-UBTU-20-010135
- configure_strategy
- file_groupownership_audit_configuration
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
