The operating system must immediately notify the System Administrator (SA) and Information System Security Officer ISSO (at a minimum) when allocated audit record storage volume reaches 75% of the repository maximum audit record storage capacity.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-72089	RHEL-07-030330	SV-86713r1_rule		Medium

Description
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.

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2017-07-08

Details

Check Text ( C-72321r1_chk )
Verify the operating system immediately 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. Check the system configuration to determine the partition the audit records are being written to with the following command: # grep log_file /etc/audit/auditd.conf log_file = /var/log/audit/audit.log Check the size of the partition that audit records are written to (with the example being "/var/log/audit/"): # df -h /var/log/audit/ 0.9G /var/log/audit If the audit records are not being written to a partition specifically created for audit records (in this example "/var/log/audit" is a separate partition), determine the amount of space other files in the partition are currently occupying with the following command: # du -sh 1.8G /var Determine what the threshold is for the system to take action when 75 percent of the repository maximum audit record storage capacity is reached: # grep -i space_left /etc/audit/auditd.conf space_left = 225 If the value of the "space_left" keyword is not set to 25 percent of the total partition size, this is a finding.

Check Text ( C-72321r1_chk )

Verify the operating system immediately 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.

Check the system configuration to determine the partition the audit records are being written to with the following command:

# grep log_file /etc/audit/auditd.conf
log_file = /var/log/audit/audit.log

Check the size of the partition that audit records are written to (with the example being "/var/log/audit/"):

# df -h /var/log/audit/
0.9G /var/log/audit

If the audit records are not being written to a partition specifically created for audit records (in this example "/var/log/audit" is a separate partition), determine the amount of space other files in the partition are currently occupying with the following command:

# du -sh
1.8G /var

Determine what the threshold is for the system to take action when 75 percent of the repository maximum audit record storage capacity is reached:

# grep -i space_left /etc/audit/auditd.conf
space_left = 225

If the value of the "space_left" keyword is not set to 25 percent of the total partition size, this is a finding.

Fix Text (F-78441r1_fix)
Configure the operating system to immediately 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. Check the system configuration to determine the partition the audit records are being written to: # grep log_file /etc/audit/auditd.conf Determine the size of the partition that audit records are written to (with the example being "/var/log/audit/"): # df -h /var/log/audit/ Set the value of the "space_left" keyword in "/etc/audit/auditd.conf" to 75 percent of the partition size.

Fix Text (F-78441r1_fix)

Configure the operating system to immediately 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.

Check the system configuration to determine the partition the audit records are being written to:

# grep log_file /etc/audit/auditd.conf

Determine the size of the partition that audit records are written to (with the example being "/var/log/audit/"):

# df -h /var/log/audit/

Set the value of the "space_left" keyword in "/etc/audit/auditd.conf" to 75 percent of the partition size.