The DNS server implementation must enforce approved authorizations for controlling the flow of information between DNS servers and between DNS servers and DNS clients based on DNSSEC policies.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
SRG-APP-000039-DNS-000003	SRG-APP-000039-DNS-000003	SRG-APP-000039-DNS-000003_rule		Medium

Description
A mechanism to detect and prevent unauthorized communication flow must be configured or provided as part of the system design. If information flow is not enforced based on approved authorizations, the system may become compromised. Information flow control regulates where information is allowed to travel within a system and between interconnected systems. The flow of all application information must be monitored and controlled so it does not introduce any unacceptable risk to the systems or data. Application specific examples of enforcement occurs in systems that employ rule sets or establish configuration settings that restrict information system services, or provide a message filtering capability based on message content (e.g., implementing key word searches or using document characteristics). Applications providing information flow control must be able to enforce approved authorizations for controlling the flow of information between interconnected systems in accordance with applicable policy. Within the context of DNS, this is applicable in terms of controlling the flow of DNS information between systems, such as DNS zone transfers.

Description

A mechanism to detect and prevent unauthorized communication flow must be configured or provided as part of the system design. If information flow is not enforced based on approved authorizations, the system may become compromised. Information flow control regulates where information is allowed to travel within a system and between interconnected systems. The flow of all application information must be monitored and controlled so it does not introduce any unacceptable risk to the systems or data. Application specific examples of enforcement occurs in systems that employ rule sets or establish configuration settings that restrict information system services, or provide a message filtering capability based on message content (e.g., implementing key word searches or using document characteristics). Applications providing information flow control must be able to enforce approved authorizations for controlling the flow of information between interconnected systems in accordance with applicable policy. Within the context of DNS, this is applicable in terms of controlling the flow of DNS information between systems, such as DNS zone transfers.

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

Details

Check Text ( C-SRG-APP-000039-DNS-000003_chk )
Review the DNS server implementation configuration to determine if the DNS server enforces approved authorizations for controlling the information flow by accepting only signed zone transfers between DNS servers and signed dynamic updates from DNS clients to the master name server. If the server does not enforce approved authorizations for controlling the information flow by accepting only signed zone transfers between DNS servers and signed dynamic updates from DNS clients to the master name server, this is a finding.

Check Text ( C-SRG-APP-000039-DNS-000003_chk )

Review the DNS server implementation configuration to determine if the DNS server enforces approved authorizations for controlling the information flow by accepting only signed zone transfers between DNS servers and signed dynamic updates from DNS clients to the master name server.

If the server does not enforce approved authorizations for controlling the information flow by accepting only signed zone transfers between DNS servers and signed dynamic updates from DNS clients to the master name server, this is a finding.

Fix Text (F-SRG-APP-000039-DNS-000003_fix)
Configure the DNS server to enforce approved authorizations for controlling the information flow by applying DNSSEC and TSIG signing practices to the DNS implementation.