MA-7 MA · Maintenance

Field Maintenance

LOW MODERATE HIGH
1 Overlay 3 Related Controls
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Requirements NIST SOURCE

Restrict or prohibit field maintenance on [systems or system components] to [trusted maintenance facilities].

Discussion (NIST Supplemental Guidance)

Field maintenance is the type of maintenance conducted on a system or system component after the system or component has been deployed to a specific site (i.e., operational environment). In certain instances, field maintenance (i.e., local maintenance at the site) may not be executed with the same degree of rigor or with the same quality control checks as depot maintenance. For critical systems designated as such by the organization, it may be necessary to restrict or prohibit field maintenance at the local site and require that such maintenance be conducted in trusted facilities with additional controls.

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-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. systems or system components on which field maintenance is restricted or prohibited to trusted maintenance facilities are defined;
  2. trusted maintenance facilities that are not restricted or prohibited from conducting field maintenance are defined;
  3. field maintenance on <MA-07_ODP[01] systems or system components> are restricted or prohibited to <MA-07_ODP[02] trusted maintenance facilities>.

Examine

[SELECT FROM: Maintenance policy; procedures addressing field maintenance; system design documentation; system configuration settings and associated documentation; maintenance records; diagnostic records; system security plan; other relevant documents or records.].

Interview

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

Test

[SELECT FROM: Organizational processes for managing field maintenance; mechanisms implementing, supporting, and/or managing field maintenance; mechanisms for strong authentication of field maintenance diagnostic sessions; mechanisms for terminating field maintenance sessions and network connections].

Overlays

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: Added (beyond standard baseline)

MODERATE

  • Base control: Added (beyond standard baseline)

HIGH

  • Base control: Added (beyond standard baseline)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for MA-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

  • Organizational processes for managing field maintenance
  • mechanisms implementing, supporting, and/or managing field maintenance
  • mechanisms for strong authentication of field maintenance diagnostic sessions
  • mechanisms for terminating field maintenance sessions and network connections

Other Records

  • procedures addressing field maintenance
  • maintenance records
  • diagnostic records
  • other relevant documents or records