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

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

- Skill: `cyberstrikeus/ia-13-2-verification-of-identity-assertions-and-access-token` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/ia-13-2-verification-of-identity-assertions-and-access-token`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/ia-13-2-verification-of-identity-assertions-and-access-token/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector CAUTION)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/ia-13-2-verification-of-identity-assertions-and-access-token

---


# 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 | Test authentication mechanisms | `hackbrowser`        |

## 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

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.

## 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

- [NIST SP 800-53 Rev 5 - IA-13(2)](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=ia-13.2)
- [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 (none) reviewed