NIST SP 800-53 Rev. 5 SA-9(1) — Risk Assessments And Organizational Approvals

What this control requires

Conduct risk assessments before acquiring or outsourcing information security services. Ensure such acquisitions are formally approved by organization-defined personnel or roles. This control supports the Risk-Informed Acquisition Protocol capability within the System and Services Acquisition family.

In plain English

Conduct risk assessments before acquiring or outsourcing information security services. In practice, this means you can prove you information 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 System and Services Acquisition, the assessor will trace your implementation back to the catalogue reference (Control SA-9(1)) and look for objective evidence on the latest two assessment cycles.

How to implement

Incident Response

Runbook. Maintain a runbook keyed by incident type with named roles (IC, comms, scribe), an out-of-band comms channel, and a 72-hour timeline for external notification.

Tabletop. Run a quarterly tabletop exercise (ransomware, insider, supply-chain) and feed gaps back into the runbook.

Operational checklist

• Information. Document the trigger, the owner and the cadence.
• Security. Document the trigger, the owner and the cadence.
• Response. Document the trigger, the owner and the cadence.
• System. Document the trigger, the owner and the cadence.
• Control. Document the trigger, the owner and the cadence.
• Scope: management, information, organization, system, personnel, assessments, services, capability.

Evidence to collect

• Ticketing Workflow. ticketing_workflow evidence
• Infra Scan. Continuous infrastructure-posture telemetry — AWS Config, Azure Policy compliance, GCP Organisation Policy, Wiz / Prisma findings.

Workflow metrics (ServiceNow, Jira) show approvals and remediation. Focus: Risk Assessments And Organizational Approvals.

Common pitfalls

• Runbooks that name a role but no person, or list a paging channel that no longer exists.

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.

• ISO/IEC 27001:2022 A.5.8 — Information security in project management
• NIST SP 800-171 Rev. 3 3.3.5 — Audit Record Review, Analysis, and Reporting

Related controls in NIST SP 800-53 Rev. 5

• Control SA-15(10) — Incident Response Plan
• Control IR-6(2) — Vulnerabilities Related To Incidents
• Control SA-8(25) — Economic Security
• Control IR-2(1) — Simulated Events
• Control SI-4(24) — Indicators Of Compromise
• Control SA-21(1) — Validation Of Screening

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control SA-9(1)

Topics: governance riskchange managementincident response