# MA-4(3)_comparable-security-and-sanitization

> Require that nonlocal maintenance and diagnostic services be performed from a system that implements a security capability comparable to the capabi...

- Skill: `cyberstrikeus/ma-4-3-comparable-security-and-sanitization` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/ma-4-3-comparable-security-and-sanitization`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/ma-4-3-comparable-security-and-sanitization/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/ma-4-3-comparable-security-and-sanitization

---


# MA-4(3) Comparable Security and Sanitization

> **Enhancement of:** MA-4

## High-Level Description

**Family:** Maintenance (MA)
**Framework:** NIST SP 800-53 Rev 5

Comparable security capability on systems, diagnostic tools, and equipment providing maintenance services implies that the implemented controls on those systems, tools, and equipment are at least as comprehensive as the controls on the system being serviced.

## What to Check

- [ ] Verify MA-4(3) Comparable Security and Sanitization is documented in SSP
- [ ] Validate all 4 control requirements are implemented
- [ ] Confirm control is operating effectively
- [ ] Review evidence of continuous monitoring for MA-4(3)
- [ ] Verify enhancement builds upon base control MA-4

## How to Test

### Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for MA-4(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

Require that nonlocal maintenance and diagnostic services be performed from a system that implements a security capability comparable to the capability implemented on the system being serviced; or
Remove the component to be serviced from the system prior to nonlocal maintenance or diagnostic services; sanitize the component (for organizational information); and after the service is performed, inspect and sanitize the component (for potentially malicious software) before reconnecting the component to the system.

### Implementation Guidance

Comparable security capability on systems, diagnostic tools, and equipment providing maintenance services implies that the implemented controls on those systems, tools, and equipment are at least as comprehensive as the controls on the system being serviced.

## Risk Assessment

| Finding                                                      | Severity | Impact                 |
| ------------------------------------------------------------ | -------- | ---------------------- |
| MA-4(3) Comparable Security and Sanitization not implemented | Medium   | Maintenance            |
| MA-4(3) partially implemented                                | Low      | Incomplete Maintenance |

## CWE Categories

| CWE ID | Title                 |
| ------ | --------------------- |
| N/A    | No direct CWE mapping |

## References

- [NIST SP 800-53 Rev 5 - MA-4(3)](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=ma-4.3)
- [NIST SP 800-53A Rev 5 (Assessment Procedures)](https://csrc.nist.gov/pubs/sp/800/53/a/r5/final)
- [NIST SP 800-53 Rev 5 Full Catalog](https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final)

## Checklist

- [ ] Control documented in SSP
- [ ] Implementation evidence collected
- [ ] Operating effectiveness validated
- [ ] Continuous monitoring in place
- [ ] Related controls (MP-6, SI-3, SI-7) reviewed