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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.


Finding ID Version Rule ID IA Controls Severity
V-218050 RHEL-06-000304 SV-218050r505923_rule Medium
By default, AIDE does not install itself for periodic execution. Periodically running AIDE may reveal unexpected changes in installed files.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2020-09-03


Check Text ( C-19531r377165_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-19529r377166_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.