cis-ubuntu1604-v200-1-3-2

name	cis-ubuntu1604-v200-1-3-2
description	Ensure filesystem integrity is regularly checked
category	cis-storage
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","aide","file-integrity","cron","systemd"]
cis_id	1.3.2
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - 1.3.2

Profile Applicability

• Level 1 - Server
• Level 1 - Workstation

Description

Periodic checking of the filesystem integrity is needed to detect changes to the filesystem.

Rationale

Periodic file checking allows the system administrator to determine on a regular basis if critical files have been changed in an unauthorized fashion.

Audit Procedure

Command Line

Run the following commands to verify a cron job scheduled to run the aide check:

grep -Ers '^([^#]+\s+)?(\/usr\/s?bin\/|^\s*)aide(\.wrapper)?\s(--check|\$AIDEARGS)\b' /etc/cron.* /etc/crontab /var/spool/cron/

Ensure a cron job in compliance with site policy is returned.

OR Run the following commands to verify that aidecheck.service and aidecheck.timer are enabled and aidecheck.timer is running:

systemctl is-enabled aidecheck.service

systemctl is-enabled aidecheck.timer
systemctl status aidecheck.timer

Expected Result

A cron job or systemd timer should be configured to run AIDE checks regularly.

Remediation

Command Line

If cron will be used to schedule and run aide check, run the following command:

crontab -u root -e

Add the following line to the crontab:

0 5 * * * /usr/bin/aide.wrapper --config /etc/aide/aide.conf --check

OR If aidecheck.service and aidecheck.timer will be used to schedule and run aide check:

Create or edit the file /etc/systemd/system/aidecheck.service and add the following lines:

[Unit]
Description=Aide Check

[Service]
Type=simple
ExecStart=/usr/bin/aide.wrapper --config /etc/aide/aide.conf --check

[Install]
WantedBy=multi-user.target

Create or edit the file /etc/systemd/system/aidecheck.timer and add the following lines:

[Unit]
Description=Aide check every day at 5AM

[Timer]
OnCalendar=*-*-* 05:00:00
Unit=aidecheck.service

[Install]
WantedBy=multi-user.target

Run the following commands:

chown root:root /etc/systemd/system/aidecheck.*
chmod 0644 /etc/systemd/system/aidecheck.*
systemctl daemon-reload
systemctl  aidecheck.service
systemctl --now  aidecheck.timer