si-8-spam-protection

name	SI-8_spam-protection
description	Employ spam protection mechanisms at system entry and exit points to detect and act on unsolicited messages;
category	input-validation
version	5.2.0
author	cyberstrike-official
tags	["nist","sp800-53","rev5","si-8","si"]
tech_stack	["aws","azure","gcp","linux","windows"]
cwe_ids	["CWE-20"]
chains_with	["PL-9","SC-5","SC-7","SC-38","SI-3","SI-4"]
prerequisites	[]
severity_boost	{"PL-9":"Chain with PL-9 for comprehensive security coverage","SC-5":"Chain with SC-5 for comprehensive security coverage","SC-7":"Chain with SC-7 for comprehensive security coverage"}

SI-8 Spam Protection

High-Level Description

Family: System and Information Integrity (SI) Framework: NIST SP 800-53 Rev 5

System entry and exit points include firewalls, remote-access servers, electronic mail servers, web servers, proxy servers, workstations, notebook computers, and mobile devices. Spam can be transported by different means, including email, email attachments, and web accesses. Spam protection mechanisms include signature definitions.

What to Check

• Verify SI-8 Spam Protection is documented in SSP
• Validate all 2 control requirements are implemented
• Confirm control is operating effectively
• Review evidence of continuous monitoring for SI-8

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for SI-8 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 integrity monitoring	cloud_audit_monitoring
AWS CLI	Review GuardDuty/Inspector	aws guardduty list-detectors

Remediation Guide

Control Statement

Employ spam protection mechanisms at system entry and exit points to detect and act on unsolicited messages; and Update spam protection mechanisms when new releases are available in accordance with organizational configuration management policy and procedures.

Implementation Guidance

System entry and exit points include firewalls, remote-access servers, electronic mail servers, web servers, proxy servers, workstations, notebook computers, and mobile devices. Spam can be transported by different means, including email, email attachments, and web accesses. Spam protection mechanisms include signature definitions.