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Check: SRG-APP-000422-DNS-000055

Domain Name System (DNS) SRG: SRG-APP-000422-DNS-000055 (in versions v3 r2 through v2 r4)

Title

A DNS server implementation must provide additional integrity artifacts along with the authoritative name resolution data the system returns in response to external name/address resolution queries. (Cat II impact)

Discussion

The major threat associated with DNS forged responses or failures is the integrity of the DNS data returned in the response. The principle of DNSSEC is to mitigate this threat by providing data origin authentication, establishing trust in the source. This requirement enables remote clients to obtain origin authentication and integrity verification assurances for the host/service name to network address resolution information obtained through the service. A DNS server is an example of an information system providing name/address resolution service. Digital signatures and cryptographic keys are examples of additional artifacts. DNS resource records are examples of authoritative data. Applications other than the DNS to map between host/service names and network addresses must provide other means to assure the authenticity and integrity of response data. In the case of DNS, employ DNSSEC to provide an additional data origin and integrity artifacts along with the authoritative data the system returns in response to DNS name/address resolution queries.

Check Content

Review the DNS server implementation configuration to determine if the DNS server provides additional integrity artifacts along with the authoritative name resolution data the system returns in response to external name/address resolution queries. If the DNS server does not provide such integrity artifacts, this is a finding.

Fix Text

Configure the DNS server to provide additional integrity artifacts along with the authoritative name resolution data the system returns in response to external name/address resolution queries.

Additional Identifiers

Rule ID: SV-205208r879793_rule

Vulnerability ID: V-205208

Group Title: SRG-APP-000422

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CCIs

CCIs tied to check.

Number	Definition
CCI-002462	The information system provides additional data integrity verification artifacts along with the authoritative name resolution data the system returns in response to external name/address resolution queries.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
SC-20	Secure Name / Address Resolution Service (Authoritative Source)