Title

SLEM 5 must notify the system administrator (SA) when Advanced Intrusion Detection Environment (AIDE) discovers anomalies in the operation of any security functions. (Cat II impact)

Discussion

If anomalies are not acted on, security functions may fail to secure the system. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters. Notifications provided by information systems include messages to local computer consoles and/or hardware indications, such as lights. This capability must take into account operational requirements for availability for selecting an appropriate response. The organization may choose to shut down or restart the information system upon security function anomaly detection.

Check Content

Verify SLEM 5 notifies the SA when AIDE discovers anomalies in the operation of any security functions. Note: A file integrity tool other than AIDE may be used, but the tool must be configured to notify the system administrator and/or ISSO if there is an anomaly. Verify the aide cron job sends an email when executed with the following command: > sudo grep -i "aide" /etc/cron.*/aide 0 0 * * * /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil If the "aide" file does not exist under the "/etc/cron" directory structure or the cron job is not configured to execute a binary to send an email (such as "/bin/mail"), this is a finding.

Fix Text

Configure SLEM 5 to notify the SA when AIDE discovers anomalies in the operation of any security functions. Add or modify the following line in the "/etc/cron.daily/aide" file: 0 0 * * * /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil

Additional Identifiers

Rule ID: SV-261408r996640_rule

Vulnerability ID: V-261408

Group Title: SRG-OS-000447-GPOS-00201

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.