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AC-4(14) AC · Access Control

Security or Privacy Policy Filter Constraints

LOW MODERATE HIGH
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Requirements NIST SOURCE

When transferring information between different security domains, implement [organization-defined security or privacy policy filters] requiring fully enumerated formats that restrict data structure and content.

Discussion (NIST Supplemental Guidance)

Data structure and content restrictions reduce the range of potential malicious or unsanctioned content in cross-domain transactions. Security or privacy policy filters that restrict data structures include restricting file sizes and field lengths. Data content policy filters include encoding formats for character sets, restricting character data fields to only contain alpha-numeric characters, prohibiting special characters, and validating schema structures.

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-4(14) 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. security policy filters to be implemented that require fully enumerated formats restricting data structure and content have been defined;
  2. privacy policy filters to be implemented that require fully enumerated formats restricting data structure and content are defined;
  3. when transferring information between different security domains, implemented <AC-04(14)_ODP[01] security policy filters> require fully enumerated formats that restrict data structure and content;
  4. when transferring information between different security domains, implemented <AC-04(14)_ODP[02] privacy policy filters> require fully enumerated formats that restrict data structure and content.

Examine

[SELECT FROM: Access control policy; information flow control policies; procedures addressing information flow enforcement; system design documentation; system configuration settings and associated documentation; list of security and privacy policy filters; list of data structure policy filters; list of data content policy filters; system audit records; system security plan; privacy plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security and privacy responsibilities; system developers].

Test

[SELECT FROM: Mechanisms implementing information flow enforcement policy; security and privacy policy filters].

Overlays

Showing the OT/ICS overlay for the parent control AC-4 — see the AC-4(14) 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)
  • Included: (4)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for AC-4(14). 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
  • information flow control policies
  • list of security and privacy policy filters
  • list of data structure policy filters
  • list of data content policy filters
  • system security plan
  • privacy plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Mechanisms implementing information flow enforcement policy
  • security and privacy policy filters

Other Records

  • procedures addressing information flow enforcement
  • system audit records
  • other relevant documents or records