SR-3(1)_diverse-supply-base

DevOps & Security

Employ a diverse set of sources for the following system components and services: [organization-defined].

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/NIST/SP800-53_rev5/SR_supply-chain-risk-management/SR-3(1)_diverse-supply-base/SKILL.md

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SR-3(1) Diverse Supply Base

Enhancement of: SR-3

High-Level Description

Family: Supply Chain Risk Management (SR) Framework: NIST SP 800-53 Rev 5

Diversifying the supply of systems, system components, and services can reduce the probability that adversaries will successfully identify and target the supply chain and can reduce the impact of a supply chain event or compromise. Identifying multiple suppliers for replacement components can reduce the probability that the replacement component will become unavailable. Employing a diverse set of developers or logistics service providers can reduce the impact of a natural disaster or other supply chain event. Organizations consider designing the system to include diverse materials and components.

What to Check

Verify SR-3(1) Diverse Supply Base is documented in SSP
Confirm control is operating effectively
Review evidence of continuous monitoring for SR-3(1)
Verify enhancement builds upon base control SR-3

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for SR-3(1) 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

Employ a diverse set of sources for the following system components and services: [organization-defined].

Implementation Guidance

Risk Assessment

Finding	Severity	Impact
SR-3(1) Diverse Supply Base not implemented	Medium	Supply Chain Risk Management
SR-3(1) partially implemented	Low	Incomplete Supply Chain Risk Management

CWE Categories

CWE ID	Title
N/A	No direct CWE mapping

References

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (none) reviewed