← SA-9
SA-9(2) SA · System and Services Acquisition

Identification of Functions, Ports, Protocols, and Services

LOW ✓ MODERATE ✓ HIGH
1 Overlay 2 Related Controls
Graph
Export ▾

Requirements NIST SOURCE

Require providers of the following external system services to identify the functions, ports, protocols, and other services required for the use of such services: [external system services].

Discussion (NIST Supplemental Guidance)

Information from external service providers regarding the specific functions, ports, protocols, and services used in the provision of such services can be useful when the need arises to understand the trade-offs involved in restricting certain functions and services or blocking certain ports and protocols.

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 SA-9(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. external system services that require the identification of functions, ports, protocols, and other services are defined;
  2. providers of <SA-09(02)_ODP external system services> are required to identify the functions, ports, protocols, and other services required for the use of such services.

Examine

[SELECT FROM: System and services acquisition policy; supply chain risk management policy and procedures; procedures addressing external system services; acquisition contracts for the system, system component, or system service; acquisition documentation; solicitation documentation; service level agreements; organizational security requirements and security specifications for external service providers; list of required functions, ports, protocols, and other services; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with system and service acquisition responsibilities; organizational personnel with information security responsibilities; system/network administrators; external providers of system services].

Overlays

Showing the OT/ICS overlay for the parent control SA-9 — see the SA-9(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

  • Base control: Included (matches standard baseline)

MODERATE

  • Base control: Included (matches standard baseline)
  • Included: (2)

HIGH

  • Base control: Included (matches standard baseline)
  • Included: (2)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for SA-9(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

  • System and services acquisition policy
  • supply chain risk management policy and procedures
  • system security plan

Other Records

  • procedures addressing external system services
  • acquisition contracts for the system, system component, or system service
  • acquisition documentation
  • solicitation documentation
  • service level agreements
  • organizational security requirements and security specifications for external service providers
  • list of required functions, ports, protocols, and other services
  • other relevant documents or records