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AC-21(2) AC · Access Control

Information Search and Retrieval

LOW MODERATE HIGH
1 Overlay 0 Related Controls
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Requirements NIST SOURCE

Implement information search and retrieval services that enforce [information-sharing restrictions].

Discussion (NIST Supplemental Guidance)

Information search and retrieval services identify information system resources relevant to an information need.

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-21(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. information-sharing restrictions to be enforced by information search and retrieval services are defined;
  2. information search and retrieval services that enforce <AC-21(02)_ODP information-sharing restrictions> are implemented.

Examine

[SELECT FROM: Access control policy; procedures addressing user-based collaboration and information sharing (including restrictions); system design documentation; system configuration settings and associated documentation; system-generated list of access restrictions regarding information to be shared; information search and retrieval records; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with access enforcement responsibilities for system search and retrieval services; system/network administrators; organizational personnel with information security responsibilities; system developers].

Test

[SELECT FROM: System search and retrieval services enforcing information-sharing restrictions].

Overlays

Showing the OT/ICS overlay for the parent control AC-21 — see the AC-21(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

Not applicable at this tier.

MODERATE

  • Base control: Included (matches standard baseline)

HIGH

  • Base control: Included (matches standard baseline)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for AC-21(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 design documentation
  • system configuration settings and associated documentation

Testing

  • System search and retrieval services enforcing information-sharing restrictions

Other Records

  • procedures addressing user-based collaboration and information sharing (including restrictions)
  • system-generated list of access restrictions regarding information to be shared
  • information search and retrieval records
  • system audit records
  • other relevant documents or records