NIST SP 800-53 Rev. 5·Control IA-2·high·Component: Identification and Authentication

What this control requires

Uniquely identify/authenticate organizational users, linking identities to processes for secure local/network/remote access using passwords, authenticators, or biometrics. This control supports the Authentication capability within the Identification and Authentication family.
— NIST SP 800-53 Rev. 5, Control IA-2

In plain English

Uniquely identify/authenticate organizational users, linking identities to processes for secure local/network/remote access using passwords, authenticators, or biometrics. In practice, this means you can prove you access management-level controls on a defined cadence.

Why it matters

SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed.

This control is rated high. Auditors expect a named owner, a remediation SLA, and a tooling artefact that evidences continuous operation.

What an auditor looks for

A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan.

Within Identification and Authentication, the assessor will trace your implementation back to the catalogue reference (Control IA-2) and look for objective evidence on the latest two assessment cycles.

How to implement

Network Security

AWS. VPC Flow Logs to S3, default-deny security groups, AWS Network Firewall for north-south, and Transit Gateway for hub-and-spoke segmentation.

Azure. NSGs with deny-by-default, Azure Firewall Premium with TLS inspection, Private Endpoints for PaaS, and Microsoft Defender for Cloud's secure score for drift.

GCP. VPC Service Controls perimeters around sensitive APIs, Cloud NGFW Enterprise for L7 inspection, Private Service Connect for managed services.

Operational checklist

  • Access. Document the trigger, the owner and the cadence.
  • Security. Document the trigger, the owner and the cadence.
  • Network. Document the trigger, the owner and the cadence.
  • Review. Document the trigger, the owner and the cadence.
  • Remote. Document the trigger, the owner and the cadence.
  • Scope: management, authentication, identity, review, capability, authentication (organizational users), authenticators, biometrics.

Evidence to collect

  • Identity Scan. IAM / IdP exports — Entra ID, Okta, IAM Identity Center, Workspace directory — showing accounts, roles, MFA state and last sign-in.
  • Policy Document. A signed and version-controlled policy / standard / procedure document.
  • Infra Scan. Continuous infrastructure-posture telemetry — AWS Config, Azure Policy compliance, GCP Organisation Policy, Wiz / Prisma findings.

Identity analytics (Okta, SailPoint, Access Analyzer) demonstrates least-privilege. Signed policy or standard documents the safeguard. Focus: Identification And Authentication (Organizational Users).

Common pitfalls

  • Default-allow egress rules; East-West traffic with no segmentation; jump hosts on the public internet with password auth.

How it maps to other frameworks

Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit.

Related controls in NIST SP 800-53 Rev. 5

References

Topics: governance riskidentity accessidentity managementaccess reviewprivileged accessnetwork security