AC-24_access-control-decisions

DevOps & Security

[organization-defined] to ensure [organization-defined] are applied to each access request prior to access enforcement.

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/NIST/SP800-53_rev5/AC_access-control/AC-24_access-control-decisions/SKILL.md

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AC-24 Access Control Decisions

High-Level Description

Family: Access Control (AC) Framework: NIST SP 800-53 Rev 5

Access control decisions (also known as authorization decisions) occur when authorization information is applied to specific accesses. In contrast, access enforcement occurs when systems enforce access control decisions. While it is common to have access control decisions and access enforcement implemented by the same entity, it is not required, and it is not always an optimal implementation choice. For some architectures and distributed systems, different entities may make access control decisions and enforce access.

What to Check

Verify AC-24 Access Control Decisions is documented in SSP
Confirm control is operating effectively
Review evidence of continuous monitoring for AC-24

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for AC-24 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
cloud-audit-mcp	Check IAM policies and access controls	`cloud_audit_iam_policies`
hackbrowser-mcp	Test web application access controls	`browser_auth_test`

Remediation Guide

Control Statement

[organization-defined] to ensure [organization-defined] are applied to each access request prior to access enforcement.

Implementation Guidance

Risk Assessment

Finding	Severity	Impact
AC-24 Access Control Decisions not implemented	High	Access Control
AC-24 partially implemented	Medium	Incomplete Access Control

CWE Categories

CWE ID	Title
CWE-284	Improper Access Control

References

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (AC-2, AC-3) reviewed