Vulnerability Discussion

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

Check

Verify RHEL 8 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 commands:

$ sudo grep space_left /etc/audit/auditd.conf

space_left = 25%
space_left_action = email

If the value of the "space_left" keyword is not set to "25%" and the "space_left_action" is not set to "email", or if these lines are commented out, ask the System Administrator 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 the operating system 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 lines in the /etc/audit/auditd.conf file.

space_left = 25%
space_left_action = email

Note: Option names and values in the auditd.conf file are case insensitive.