The DNS implementation must provide a warning when the logging storage capacity reaches an organization defined percentage of maximum capacity.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-33985	SRG-NET-000084-DNS-000043	SV-44438r1_rule		Medium

Description
It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. An audit processing failure includes the audit storage capacity being reached or exceeded. If audit log capacity were to be exceeded then events subsequently occurring will not be recorded. The DNS implementation must have a defined maximum allowable percentage of storage capacity serving as an alarming threshold (e.g., application has exceeded 80% of log storage capacity allocated) at which time the DNS, or the logging function the DNS utilizes must provide a warning to the appropriate personnel. If personnel are not notified to allow for appropriate action to be taken when the storage capacity is at risk of being reached, the DNS implementation is at risk of failing to log suspect events or shutting down.

Description

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. An audit processing failure includes the audit storage capacity being reached or exceeded. If audit log capacity were to be exceeded then events subsequently occurring will not be recorded. The DNS implementation must have a defined maximum allowable percentage of storage capacity serving as an alarming threshold (e.g., application has exceeded 80% of log storage capacity allocated) at which time the DNS, or the logging function the DNS utilizes must provide a warning to the appropriate personnel. If personnel are not notified to allow for appropriate action to be taken when the storage capacity is at risk of being reached, the DNS implementation is at risk of failing to log suspect events or shutting down.

STIG	Date
Domain Name System (DNS) Security Requirements Guide	2012-10-24

Details

Check Text ( C-41989r1_chk )
Review the DNS system configuration to determine whether a warning will be provided when a specific percentage of log storage capacity is reached. If no warning will be provided when log capacity is at risk of being exceeded, this is a finding.

Fix Text (F-37900r1_fix)
Configure the DNS system to send an alert or warning to appropriate personnel when the generated logs exceed a pre-determined percentage of the defined maximum capacity.