SA 11(6) Attack Surface Reviews

---
name: "SA-11(6)_attack-surface-reviews"
description: "Require the developer of the system, system component, or system service to perform attack surface reviews."
category: "configuration"
version: "5.2.0"
author: "cyberstrike-official"
tags:
  - nist
  - sp800-53
  - rev5
  - sa-11-6
  - sa
  - enhancement
tech_stack:
  - any
cwe_ids:
  - CWE-16
chains_with:
  - SA-15
prerequisites:
  - SA-11
severity_boost:
  SA-15: "Chain with SA-15 for comprehensive security coverage"
---

# SA-11(6) Attack Surface Reviews

> **Enhancement of:** SA-11

## High-Level Description

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

Attack surfaces of systems and system components are exposed areas that make those systems more vulnerable to attacks. Attack surfaces include any accessible areas where weaknesses or deficiencies in the hardware, software, and firmware components provide opportunities for adversaries to exploit vulnerabilities. Attack surface reviews ensure that developers analyze the design and implementation changes to systems and mitigate attack vectors generated as a result of the changes. The correction of identified flaws includes deprecation of unsafe functions.

## What to Check

- [ ] Verify SA-11(6) Attack Surface Reviews is documented in SSP
- [ ] Confirm control is operating effectively
- [ ] Review evidence of continuous monitoring for SA-11(6)
- [ ] Verify enhancement builds upon base control SA-11

## How to Test

### Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for SA-11(6) 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 the developer of the system, system component, or system service to perform attack surface reviews.

### Implementation Guidance

Attack surfaces of systems and system components are exposed areas that make those systems more vulnerable to attacks. Attack surfaces include any accessible areas where weaknesses or deficiencies in the hardware, software, and firmware components provide opportunities for adversaries to exploit vulnerabilities. Attack surface reviews ensure that developers analyze the design and implementation changes to systems and mitigate attack vectors generated as a result of the changes. The correction of identified flaws includes deprecation of unsafe functions.

## Risk Assessment

| Finding                                         | Severity | Impact                                     |
| ----------------------------------------------- | -------- | ------------------------------------------ |
| SA-11(6) Attack Surface Reviews not implemented | Medium   | System and Services Acquisition            |
| SA-11(6) partially implemented                  | Low      | Incomplete System and Services Acquisition |

## CWE Categories

| CWE ID | Title         |
| ------ | ------------- |
| CWE-16 | Configuration |

## References

- [NIST SP 800-53 Rev 5 - SA-11(6)](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=sa-11.6)
- [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 (SA-15) reviewed