NIST SP 800-53 Rev. 5 MP-4 — Media Storage

What this control requires

Securely store digital (e.g., hard drives, USBs) and non-digital (e.g., paper, microfilm) media within organization-defined controlled areas to prevent unauthorized access. Ensure media remains protected through physical and logical safeguards until it is properly sanitized or destroyed, reducing the risk of data exposure. This control supports the Media Storage Control capability within the Media Protection family.

In plain English

Securely store digital (e.g., hard drives, USBs) and non-digital (e.g., paper, microfilm) media within organization-defined controlled areas to prevent unauthorized access. 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 Media Protection, the assessor will trace your implementation back to the catalogue reference (Control MP-4) and look for objective evidence on the latest two assessment cycles.

How to implement

Physical Security

Inheritance. For cloud-only operations, inherit physical controls from the provider's SOC 2 / ISO 27001 report and document the inheritance in the SoA.

Operational checklist

• Access. Document the trigger, the owner and the cadence.
• Security. Document the trigger, the owner and the cadence.
• Data. Document the trigger, the owner and the cadence.
• Physical. Document the trigger, the owner and the cadence.
• Review. Document the trigger, the owner and the cadence.
• Scope: management, organization, e, protection, identity, review, capability, media.

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: Media Storage.

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.

• SOC 2 (2017 TSC) CC6.6 — Boundary Protection
• NIST SP 800-171 Rev. 3 3.8.2 — Media Access
• ISO/IEC 27001:2022 A.5.15 — Access control
• CIS Controls v8 9.2 — Use DNS Filtering Services
• ISO/IEC 27701:2025 A.3.8 — Identity management

Related controls in NIST SP 800-53 Rev. 5

• Control MP-2(2) — Cryptographic Protection
• Control MP-6(4) — Controlled Unclassified Information
• Control MP-7(2) — Prohibit Use Of Sanitization-Resistant Media
• Control MP-7(1) — Prohibit Use Without Owner
• Control MP-4(1) — Cryptographic Protection
• Control MP-5(1) — Protection Outside Of Controlled Areas

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control MP-4

Topics: identity accessidentity managementaccess reviewprivileged accessphysical security