The operating system must employ automated mechanisms to detect the presence of unauthorized software on organizational information systems and notify designated organizational officials in accordance with the organization defined frequency.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-38698	RHEL-06-000304	SV-50499r2_rule		Medium

Description
By default, AIDE does not install itself for periodic execution. Periodically running AIDE may reveal unexpected changes in installed files.

STIG	Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide	2015-05-26

Details

Check Text ( C-46261r2_chk )
To determine that periodic AIDE execution has been scheduled, run the following command: # grep aide /etc/crontab /etc/cron.*/* If there is no output, this is a finding.

Fix Text (F-43647r1_fix)
AIDE should be executed on a periodic basis to check for changes. To implement a daily execution of AIDE at 4:05am using cron, add the following line to /etc/crontab: 05 4 * * * root /usr/sbin/aide --check AIDE can be executed periodically through other means; this is merely one example.