The DNS server implementation must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
SRG-APP-000142-DNS-000014	SRG-APP-000142-DNS-000014	SRG-APP-000142-DNS-000014_rule		Medium

Description
In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. Applications are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., email and web services; however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the application must support the organizational requirements providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or to address authorized quality of life issues.

Description

In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. Applications are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., email and web services; however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the application must support the organizational requirements providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or to address authorized quality of life issues.

STIG	Date
Domain Name System (DNS) Security Requirements Guide	2014-07-11

Details

Check Text ( C-SRG-APP-000142-DNS-000014_chk )
Review the DNS system configuration to ensure it only utilizes those PPS required for operation. All other PPS must be disabled or removed from the DNS implementation. Refer to the PPSM Category Assurance List from DISA (PPSM) for the latest DoD PPS guidance. If the DNS implementation utilizes unauthorized ports or services, this is a finding.

Fix Text (F-SRG-APP-000142-DNS-000014_fix)
Configure the DNS implementation to prohibit or restrict the use of functions, ports, protocols, and services to only those required for the DNS implementation. Remove or delete unauthorized PPS.