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AC-12(3) AC · Access Control

Timeout Warning Message

LOW MODERATE HIGH
1 Overlay 0 Related Controls
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Requirements NIST SOURCE

Display an explicit message to users indicating that the session will end in [time].

Discussion (NIST Supplemental Guidance)

To increase usability, notify users of pending session termination and prompt users to continue the session. The pending session termination time period is based on the parameters defined in the AC-12 base control.

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-12(3) 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. time until the end of session for display to users is defined;
  2. an explicit message to users is displayed indicating that the session will end in <AC-12(03)_ODP time>.

Examine

[SELECT FROM: Access control policy; procedures addressing session termination; time until end of session messages; system design documentation; system configuration settings and associated documentation; system audit records; system security plan; other relevant documents or records].

Interview

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

Test

[SELECT FROM: System session termination mechanisms; display of end of session time].

Overlays

Showing the OT/ICS overlay for the parent control AC-12 — see the AC-12(3) 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-12(3). 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 session termination mechanisms
  • display of end of session time

Other Records

  • procedures addressing session termination
  • time until end of session messages
  • system audit records
  • other relevant documents or records