Vulnerability Discussion

If security personnel are not notified immediately when storage volume reaches 75 percent usage, they are unable to plan for audit record storage capacity expansion.

Check

Verify AlmaLinux OS 9 notifies the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity with the following command:

$ grep -w space_left_action /etc/audit/auditd.conf

space_left_action = email

If the value of the "space_left_action" is not set to "email", or if the line is commented out, ask the SA to indicate how the system is providing real-time alerts to the SA and ISSO.

If there is no evidence that real-time alerts are configured on the system, this is a finding.

Fix

Configure AlmaLinux OS 9 to initiate an action to notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity by adding/modifying the following line in the /etc/audit/auditd.conf file.

space_left_action = email