EIDAUTH-004: Users with Only SMS/Voice MFA Methods
- Plataforma
- Entra ID / M365
- Categoría
- Entra ID Authentication Methods & MFA
- Severidad
- High
- Pilar de Zero Trust
- Identity (peso 2)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
Users relying solely on SMS or voice-based MFA are vulnerable to SIM swap attacks, where attackers social-engineer mobile carriers to transfer a victim's phone number, and SS7 signaling protocol attacks that intercept SMS messages in transit. These methods provide significantly weaker protection than app-based or hardware token authentication. Organizations should identify and migrate these users to phishing-resistant methods.
Valor recomendado
No users relying exclusively on SMS or voice as their only MFA method
Remediación
Identify users with only SMS/voice MFA via Entra ID > Protection > Authentication methods > User registration details. Create a migration plan to move these users to Microsoft Authenticator or FIDO2 security keys. Consider disabling SMS/voice as allowed methods in the authentication methods policy after migration is complete.
Veredictos probados con fixtures
Cada veredicto de esta tabla está probado por un fixture de referencia en la suite de pruebas que valida el módulo. La tabla se deriva de la última ejecución en verde; no puede editarse a mano.
| Escenario | Veredicto esperado |
|---|---|
| clean | PASS |
| known-bad | WARN |
| no-data | Not Assessed |
Mapeos a marcos de referencia
- CISA SCuBA
- MS.AAD.3.5v2
- NIST SP 800-53
- IA-2(1)
- CIS M365 Benchmark
- 5.2.2.4
- MITRE ATT&CK
- T1111, T1078