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SI-3(5) System and Information Integrity

Portable Storage Devices

High Risk Moderate Medium Cost

SI-3(5) (Portable Storage Devices) enhances base SI-3 within the NIST System and Information Integrity family. Base SI-3 sets the foundational expectation; this enhancement adds specificity: This enhancement strengthens SI-3 with requirements for portable storage devices in environments that create, receive, maintain, or transmit ePHI. Covered entities and business associates apply it to patching, malware defense, monitoring, and integrity verification for EHR, PACS, interfaces, and clinical endpoints.

Control Objective

Implement Portable Storage Devices so organization-defined system and information integrity safeguards operate consistently on systems and networks that handle ePHI, with measurable evidence for HIPAA and NIST assessments.

Implementation Guidance

  1. Map SI-3(5) to systems in scope (EHR, imaging, lab, pharmacy, billing, identity, backups, and BA connections).\n2. Translate “Portable Storage Devices” into technical settings, procedures, or architecture patterns owned by named roles.\n3. Prefer enforceable controls (config, automation, mediation) over awareness-only measures where feasible.\n4. Integrate with change, incident, and downtime processes so clinical operations are not surprised.\n5. Log and retain evidence of operation (tickets, configs, test results) aligned to audit needs.\n6. Include vendors/BAs in contracts and connection standards when they touch the control surface.\n7. Test after major EHR, network, or cloud changes — upgrades often reset protections.\n8. Review exceptions at least quarterly; expire “temporary” holes that expose ePHI paths.

Real-World Use Cases

How this control shows up in healthcare and HIPAA-covered environments.

Real-world scenario

USB malware on nursing PC (SI-3(5))\nCentral AV/EDR blocks autorun from a visitor USB at the med-surg station before it reaches charting sessions. Evidence labeled for SI-3(5).\n\n### Nonsignature ransomware behavior (SI-3(5))\nBehavior analytics flags mass encryption on a clinic file share holding scanned consents. Evidence labeled for SI-3(5).\n\n### Portable device scan gate (SI-3(5))\nLoaner laptops for traveling clinicians must pass malware checks before rejoining the EHR VLAN. Evidence labeled for SI-3(5).

Best Practices

  • Name an owner for SI-3(5) in the SSP control matrix.\n- Favor system enforcement on ePHI paths over informal email approval.\n- Measure coverage: percent of in-scope clinical systems where the enhancement operates.\n- Review exceptions quarterly with security and clinical informatics.\n- Feed relevant events to SIEM with a named use case.\n- Keep a one-page evidence pack (config + sample log + last test) ready for assessors.

Common Gaps & Violations

  • Policy cites SI-3(5) but production EHR/network paths show no enforcement of portable storage devices.\n- Permanent exceptions with no expiry for vendors or “special” clinics.\n- Control implemented only on corporate IT — clinical devices and interfaces omitted.\n- No logs or test records; reliance on tribal knowledge.\n- Major upgrade silently disabled the enhancement.

Required Documentation

  • Procedure/standard for Portable Storage Devices (SI-3(5))\n- Architecture or configuration baselines showing enforcement points\n- Exception register with owners and expiry\n- Sample logs, alerts, or test results\n- Training or runbook references for clinical/IT operators

How to Test & Validate

  1. Attempt a prohibited or out-of-policy action related to portable storage devices; confirm block, alert, or required workflow.\n2. Complete an authorized clinical/IT path; confirm success and logging.\n3. Sample open exceptions for approval and expiry.\n4. Verify at least one EHR-adjacent and one BA/vendor path are in scope.\n5. Confirm evidence retained for the last 90 days (or per policy).

Audit Considerations

Assessors look for operating evidence of Portable Storage Devices on systems touching ePHI — configs, logs, restore/DR artifacts, or failed-test results — not only a policy paragraph referencing SI-3(5).

HIPAA Mapping

How this NIST control supports HIPAA Security Rule expectations.

  • 164.308(a)(5)(ii)(B) Protection from Malicious Software — guard ePHI systems against malware.\n- 164.312(c)(1) Integrity — protect ePHI from improper alteration or destruction.\n- 164.312(b) Audit Controls — mechanisms that record and examine activity in systems with ePHI.\n- 164.308(a)(1)(ii)(B) Risk Management — integrity monitoring reduces residual risk to ePHI.

Compliance Tips

  • List SI-3(5) explicitly in the system security plan with system inventory references.\n- Prioritize emergency department, inpatient EHR, and remote access paths first.\n- Bundle evidence with related HIPAA evaluation, integrity, or workforce-security narratives where they overlap.

References & Resources

  • NIST SP 800-53 Rev. 5 — SI-3(5)\n- Related controls: SI-3, MP-7

Related Guidelines

Related controls that commonly accompany SI-3(5).

SI-3 High

Malicious Code Protection

SI-3 requires implementing malicious code protection at system entry and exit points and on system components, updating protections when…
MP-7 High

Media Use

MP-7 requires prohibiting or restricting the use of organization-defined types of system media on systems or system components using…
SI-1 High

System and Information Integrity Policy and Procedures

SI-1 requires system and information integrity policy and procedures addressing purpose, scope, roles, management commitment, coordination…

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