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MA-4(7) MA · Maintenance

Disconnect Verification

LOW MODERATE HIGH
1 Overlay 1 Related Control
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Requirements NIST SOURCE

Verify session and network connection termination after the completion of nonlocal maintenance and diagnostic sessions.

Discussion (NIST Supplemental Guidance)

Verifying the termination of a connection once maintenance is completed ensures that connections established during nonlocal maintenance and diagnostic sessions have been terminated and are no longer available for use.

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 MA-4(7) 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. session connection termination is verified after the completion of nonlocal maintenance and diagnostic sessions;
  2. network connection termination is verified after the completion of nonlocal maintenance and diagnostic sessions.

Examine

[SELECT FROM: Maintenance policy; procedures addressing nonlocal system maintenance; system design documentation; system configuration settings and associated documentation; session/network termination logs; cryptographic mechanisms protecting nonlocal maintenance activities; maintenance records; diagnostic records; audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with system maintenance responsibilities; network engineers; organizational personnel with information security responsibilities; system/network administrators].

Test

[SELECT FROM: Mechanisms implementing remote disconnect verifications of terminated nonlocal maintenance and diagnostic sessions].

Overlays

Showing the OT/ICS overlay for the parent control MA-4 — see the MA-4(7) 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)
  • Added: (1)

HIGH

  • Base control: Included (matches standard baseline)
  • Included: (3)
  • Added: (1)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for MA-4(7). 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

  • Maintenance policy
  • system security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Mechanisms implementing remote disconnect verifications of terminated nonlocal maintenance and diagnostic sessions

Other Records

  • procedures addressing nonlocal system maintenance
  • session/network termination logs
  • cryptographic mechanisms protecting nonlocal maintenance activities
  • maintenance records
  • diagnostic records
  • audit records
  • other relevant documents or records