A DNS server implementation must request data integrity verification on the name/address resolution responses the system receives from authoritative sources.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
SRG-APP-000424-DNS-000057	SRG-APP-000424-DNS-000057	SRG-APP-000424-DNS-000057_rule		Medium

Description
If data origin authentication and data integrity verification is not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data integrity verification must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own, or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching DNS servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations.

Description

If data origin authentication and data integrity verification is not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data integrity verification must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own, or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching DNS servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations.

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

Details

Check Text ( C-SRG-APP-000424-DNS-000057_chk )
Review the DNS server implementation configuration to determine if the DNS server requests data integrity verification on the name/address resolution responses the system receives from authoritative sources. If the DNS server does not request data integrity verification on the responses, this is a finding.

Fix Text (F-SRG-APP-000424-DNS-000057_fix)
Configure the DNS server to request data integrity verification on the name/address resolution responses the system receives from authoritative sources.