SC-21: SECURE NAME / ADDRESS RESOLUTION SERVICE (RECURSIVE OR CACHING RESOLVERS)
TAILORED FOR INDUSTRIAL CONTROL SYSTEMS
ICS Control Baselines:
The information system requests and performs data origin authentication and data integrity verification on the name/address resolution responses the system receives from authoritative sources.
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 domain name system (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. Information systems that use technologies other than the DNS to map between host/service names and network addresses provide other means to enable clients to verify the authenticity and integrity of response data.
ICS SUPPLEMENTAL GUIDANCE
The use of secure name/address resolution services is determined after careful consideration and after verification that it does not adversely impact the operation of the ICS.
RELATED CONTROLS: SC-21
SC-21 (1) SECURE NAME/ADDRESS RESOLUTION SERVICE (RECURSIVE OR CACHING RESOLVER) | DATA ORIGIN/INTEGRITY
NOT SELECTED FOR THE NIST ISC CONTROL SET
[Withdrawn: Incorporated into SC-21]. (See above.)
- NIST Special Publication 800-81