SA-9(2)_identification-of-functions-ports-protocols-and-services

DevOps & Security

Require providers of the following external system services to identify the functions, ports, protocols, and other services required for the use of su

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/NIST/SP800-53_rev5/SA_system-and-services-acquisition/SA-9(2)_identification-of-functions-ports-protocols-and-services/SKILL.md

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SA-9(2) Identification of Functions, Ports, Protocols, and Services

Enhancement of: SA-9

High-Level Description

Family: System and Services Acquisition (SA) Framework: NIST SP 800-53 Rev 5

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.

What to Check

Verify SA-9(2) Identification of Functions, Ports, Protocols, and Services is documented in SSP
Confirm control is operating effectively
Review evidence of continuous monitoring for SA-9(2)
Verify enhancement builds upon base control SA-9

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for SA-9(2) implementation details. Verify the organization has documented how this control is satisfied.

Step 2: Validate Implementation

# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null

Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

Tools

Tool	Purpose	Usage
Manual Review	Documentation and interview-based	N/A

Remediation Guide

Control Statement

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

Implementation Guidance

Risk Assessment

Finding	Severity	Impact
SA-9(2) Identification of Functions, Ports, Protocols, and Services not implemented	Medium	System and Services Acquisition
SA-9(2) partially implemented	Low	Incomplete System and Services Acquisition

CWE Categories

CWE ID	Title
CWE-16	Configuration

References

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (CM-6, CM-7) reviewed