EIDAUTH-015: Legacy Authentication Protocol Usage
- Plataforma
- Entra ID / M365
- Categoría
- Entra ID Authentication Methods & MFA
- Severidad
- High
- Pilar de Zero Trust
- Identity (peso 3)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
Legacy authentication protocols including POP3, IMAP4, SMTP AUTH, and Exchange ActiveSync Basic do not support modern authentication or MFA, allowing attackers to bypass MFA entirely using stolen credentials. These protocols transmit credentials in ways that are susceptible to interception and are the primary vector for password spray attacks against Microsoft 365 tenants. All legacy authentication should be blocked via Conditional Access policies.
Valor recomendado
All legacy authentication protocols blocked via Conditional Access with no active usage detected in sign-in logs
Remediación
Review legacy authentication usage in Entra ID > Monitoring > Sign-in logs > Filter by client app (legacy protocols). Create a Conditional Access policy to block legacy authentication for all users and all cloud apps. Monitor for blocked sign-in attempts and work with affected users to migrate to modern authentication clients.
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 | FAIL |
| no-data | Not Assessed |
Mapeos a marcos de referencia
- CISA SCuBA
- MS.AAD.1.1v1
- NIST SP 800-53
- IA-2, AC-17(2)
- CIS M365 Benchmark
- 5.2.2.3
- MITRE ATT&CK
- T1078, T1110.001