NIST SP 800-53 Rev. 5 IR-9 — Information Spillage Response

What this control requires

Define roles and responsibilities for responding to information spills, isolating affected systems, eradicating spilled data, and identifying other impacted systems. This control supports the Spillage Response capability within the Incident Response family.

In plain English

Define roles and responsibilities for responding to information spills, isolating affected systems, eradicating spilled data, and identifying other impacted systems. 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 Incident Response, the assessor will trace your implementation back to the catalogue reference (Control IR-9) and look for objective evidence on the latest two assessment cycles.

How to implement

1. Write a short policy stating intent, scope and named owner.
2. Encode it as a platform guardrail — SCP, Azure Policy initiative, Organisation Policy, or repository policy.
3. Wire a monitoring signal that catches drift (CSPM rule, SIEM rule, scheduled query, Workspace alert) and ticket it.
4. Review on a documented cadence and capture the review in the risk register or compliance tracker.

Operational checklist

• Access. Document the trigger, the owner and the cadence.
• Information. Document the trigger, the owner and the cadence.
• Data. Document the trigger, the owner and the cadence.
• Review. Document the trigger, the owner and the cadence.
• Response. Document the trigger, the owner and the cadence.
• Scope: management, information, identity, review, capability, response capability, spillage response, systems.

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.

Identity analytics (Okta, SailPoint, Access Analyzer) demonstrates least-privilege. Focus: Information Spillage Response.

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.

• CIS Controls v8 9.2 — Use DNS Filtering Services
• ISO/IEC 27001:2022 A.5.2 — Information security roles and responsibilities
• ISO/IEC 27701:2025 A.3.8 — Identity management
• SOC 2 (2017 TSC) CC1.5 — Accountability for Internal Control Responsibilities
• NIST SP 800-171 Rev. 3 3.13.4 — Information in Shared System Resources

Related controls in NIST SP 800-53 Rev. 5

• Control IR-9(4) — Exposure To Unauthorized Personnel
• Control SC-42(1) — Reporting To Authorized Individuals Or Roles
• Control IA-5(6) — Protection Of Authenticators
• Control MP-6(8) — Remote Purging Or Wiping Of Information
• Control SI-7(2) — Automated Notifications Of Integrity Violations
• Control SC-8(5) — Protected Distribution System

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control IR-9

Topics: identity accessidentity managementaccess reviewprivileged access