SC-21 Secure Name / Address Resolution Service (Recursive or Caching Resolver)
Description
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.
Applicability
The Chief Information Security and Privacy Officer (CISPO), or designee, is responsible for implementing this Control.
Implementation
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. The information system that provides name/address resolution service for local clients performs data origin authentication and data integrity verification on the resolution responses it receives from authoritative sources when requested by client systems.
Revision History
Last Updated: February 21, 2025
Previous Versions:
- June 29, 2023
- May 31, 2022
- March 25, 2021
- September 16, 2019