SLEM 5 must use a file integrity tool to verify correct operation of all security functions.

Without verification of the security functions, security functions may not operate correctly, and the failure may go unnoticed. 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.

This requirement applies to SLEM 5 performing security function verification/testing and/or systems and environments that require this functionality.

Verify that Advanced Intrusion Detection Environment (AIDE) is installed and verifies the correct operation of all security functions with the following command:

     > sudo zypper if aide | grep -i installed
     Installed: Yes

If AIDE is not installed, ask the system administrator how file integrity checks are performed on the system.

If there is no application installed to perform integrity checks, this is a finding.

If AIDE is installed, check if it has been initialized with the following command:

     > sudo aide --check

If the output is "Couldn't open file /var/lib/aide/aide.db for reading", this is a finding.

Install AIDE, initialize it, and perform a manual check by using the following commands:

Install AIDE: > sudo transactional-update pkg install aide > sudo reboot

Initialize AIDE (this may take a few minutes): > sudo aide -i

The new database will need to be renamed to be read by AIDE: > sudo mv /var/lib/aide/aide.db.new /var/lib/aide/aide.db

Perform a manual check: > sudo aide --check

Example output: Summary: Total number of files: 140621 Added files: 1 Removed files: 1 Changed files: 0