mp-5-3-custodians

name	MP-5(3)_custodians
description	Employ an identified custodian during transport of system media outside of controlled areas.
category	configuration
version	5.2.0
author	cyberstrike-official
tags	["nist","sp800-53","rev5","mp-5-3","mp","enhancement"]
tech_stack	["linux","windows"]
cwe_ids	[]
chains_with	[]
prerequisites	["MP-5"]
severity_boost	{}

MP-5(3) Custodians

Enhancement of: MP-5

High-Level Description

Family: Media Protection (MP) Framework: NIST SP 800-53 Rev 5

Identified custodians provide organizations with specific points of contact during the media transport process and facilitate individual accountability. Custodial responsibilities can be transferred from one individual to another if an unambiguous custodian is identified.

What to Check

• Verify MP-5(3) Custodians is documented in SSP
• Confirm control is operating effectively
• Review evidence of continuous monitoring for MP-5(3)
• Verify enhancement builds upon base control MP-5

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for MP-5(3) 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 an identified custodian during transport of system media outside of controlled areas.

Implementation Guidance

Identified custodians provide organizations with specific points of contact during the media transport process and facilitate individual accountability. Custodial responsibilities can be transferred from one individual to another if an unambiguous custodian is identified.

Risk Assessment

Finding	Severity	Impact
MP-5(3) Custodians not implemented