sa-8-5-efficiently-mediated-access

name	SA-8(5)_efficiently-mediated-access
description	Implement the security design principle of efficiently mediated access in [organization-defined].
category	configuration
version	5.2.0
author	cyberstrike-official
tags	["nist","sp800-53","rev5","sa-8-5","sa","enhancement"]
tech_stack	["any"]
cwe_ids	["CWE-16"]
chains_with	["AC-25"]
prerequisites	["SA-8"]
severity_boost	{"AC-25":"Chain with AC-25 for comprehensive security coverage"}

SA-8(5) Efficiently Mediated Access

Enhancement of: SA-8

High-Level Description

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

The principle of efficiently mediated access states that policy enforcement mechanisms utilize the least common mechanism available while satisfying stakeholder requirements within expressed constraints. The mediation of access to system resources (i.e., CPU, memory, devices, communication ports, services, infrastructure, data, and information) is often the predominant security function of secure systems. It also enables the realization of protections for the capability provided to stakeholders by the system. Mediation of resource access can result in performance bottlenecks if the system is not designed correctly. For example, by using hardware mechanisms, efficiently mediated access can be achieved. Once access to a low-level resource such as memory has been obtained, hardware protection mechanisms can ensure that out-of-bounds access does not occur.

What to Check

• Verify SA-8(5) Efficiently Mediated Access is documented in SSP
• Confirm control is operating effectively
• Review evidence of continuous monitoring for SA-8(5)
• Verify enhancement builds upon base control SA-8

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for SA-8(5) 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

Implement the security design principle of efficiently mediated access in [organization-defined].