IA-13(2)_verification-of-identity-assertions-and-access-tokens

DevOps & Security

The source and integrity of identity assertions and access tokens are verified before granting access to system and information resources.

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/NIST/SP800-53_rev5/IA_identification-and-authentication/IA-13(2)_verification-of-identity-assertions-and-access-tokens/SKILL.md

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IA-13(2) Verification of Identity Assertions and Access Tokens

Enhancement of: IA-13

High-Level Description

Family: Identification and Authentication (IA) Framework: NIST SP 800-53 Rev 5

This includes verification of digital signatures protecting identity assertions and access tokens, as well as included metadata. Metadata includes information about the access request such as information unique to user, system or information resource being accessed, or the transaction itself such as time. Protected system and information resources could include connected networks, applications, and APIs.

What to Check

Verify IA-13(2) Verification of Identity Assertions and Access Tokens is documented in SSP
Confirm control is operating effectively
Review evidence of continuous monitoring for IA-13(2)
Verify enhancement builds upon base control IA-13

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for IA-13(2) 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 authentication settings	`cloud_audit_iam_policies`
hackbrowser-mcp	Test authentication mechanisms	`browser_auth_test`

Remediation Guide

Control Statement

The source and integrity of identity assertions and access tokens are verified before granting access to system and information resources.

Implementation Guidance

Risk Assessment

Finding	Severity	Impact
IA-13(2) Verification of Identity Assertions and Access Tokens not implemented	High	Identification and Authentication
IA-13(2) partially implemented	Medium	Incomplete Identification and Authentication

CWE Categories

CWE ID	Title
CWE-287	Improper Authentication

References

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (none) reviewed