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AC-20(2) AC · Access Control

Portable Storage Devices — Restricted Use

LOW ✓ MODERATE ✓ HIGH
1 Overlay 2 Related Controls
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Requirements NIST SOURCE

Restrict the use of organization-controlled portable storage devices by authorized individuals on external systems using [restrictions].

Discussion (NIST Supplemental Guidance)

Limits on the use of organization-controlled portable storage devices in external systems include restrictions on how the devices may be used and under what conditions the devices may be used.

Implementation Guidance

Engineering Interpretation

Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.

No engineering interpretation has been authored for AC-20(2) yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.

Assessment

NIST SP 800-53A REV 5.2.0

Assessment Objectives

  1. restrictions on the use of organization-controlled portable storage devices by authorized individuals on external systems are defined;
  2. the use of organization-controlled portable storage devices by authorized individuals is restricted on external systems using <AC-20(02)_ODP restrictions>.

Examine

[SELECT FROM: Access control policy; procedures addressing the use of external systems; system configuration settings and associated documentation; system connection or processing agreements; account management documents; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with responsibilities for restricting or prohibiting the use of organization-controlled storage devices on external systems; system/network administrators; organizational personnel with information security responsibilities].

Test

[SELECT FROM: Mechanisms implementing restrictions on the use of portable storage devices].

Overlays

Showing the OT/ICS overlay for the parent control AC-20 — see the AC-20(2) entries within each baseline below.

OT/ICS Overlay SP 800-82r3

NIST SP 800-82r3 Appendix F, Table 22. Blank baseline means the control/control enhancement is not selected in that initial OT baseline.

LOW

  • Base control: Included (matches standard baseline)

MODERATE

  • Base control: Included (matches standard baseline)
  • Included: (1) (2)

HIGH

  • Base control: Included (matches standard baseline)
  • Included: (1) (2)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for AC-20(2). This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.

Learn more about STIG/CCI integration →

Evidence

Potential Evidence — Derived

Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.

Policy

  • Access control policy
  • system security plan

Configuration

  • system configuration settings and associated documentation

Testing

  • Mechanisms implementing restrictions on the use of portable storage devices

Other Records

  • procedures addressing the use of external systems
  • system connection or processing agreements
  • account management documents
  • other relevant documents or records