cyberstrikeus 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 | Medium | Media Protection |
| MP-5(3) partially implemented | Low | Incomplete Media Protection |
CWE Categories
| CWE ID | Title |
|---|---|
| N/A | No direct CWE mapping |
References
- NIST SP 800-53 Rev 5 - MP-5(3)
- NIST SP 800-53A Rev 5 (Assessment Procedures)
- NIST SP 800-53 Rev 5 Full Catalog
Checklist
- Control documented in SSP
- Implementation evidence collected
- Operating effectiveness validated
- Continuous monitoring in place
- Related controls (none) reviewed