EIDAUTH-006: FIDO2 Security Key Inventory and Audit
- Platform
- Entra ID / M365
- Category
- Entra ID Authentication Methods & MFA
- Severity
- Info
- Zero Trust pillar
- Identity (weight 1)
- Golden fixtures
- 2
- Branch coverage
- Observed: fixtures prove the verdicts they exercise
- Provenance
- baseline
What it checks
FIDO2 security keys provide phishing-resistant authentication but must be inventoried and managed throughout their lifecycle. Untracked keys may remain associated with departed employees or become lost without detection. Regular audits ensure only authorized keys are active and properly assigned to current users.
Recommended value
All registered FIDO2 keys inventoried with documented owner assignments and regular attestation reviews
Remediation
Review FIDO2 key registrations via Entra ID > Protection > Authentication methods > FIDO2 security key. Cross-reference registered keys with your hardware asset inventory and remove keys for departed users. Implement key registration policies that restrict allowed AAGUID values to approved vendor models.
Fixture-proven verdicts
Every verdict below is proven by a golden fixture in the module's gating test suite. This table derives from the last green run; it cannot be edited by hand.
| Scenario | Expected verdict |
|---|---|
| clean | PASS |
| no-data | Not Assessed |
Framework mappings
- CISA SCuBA
- MS.AAD.3.1v1
- NIST SP 800-53
- IA-2(6)
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Guerrilla is written and maintained by Jim Tyler. This copy lives on jimtyler.org; the project also publishes at guerrilla.army.