CVE-2024-25618

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Mastodon allows new identities from configured authentication providers (CAS, SAML, OIDC) to attach to existing local users with the same e-mail address. This results in a possible account takeover if the authentication provider allows changing the e-mail address or multiple authentication providers are configured. When a user logs in through an external authentication provider for the first time, Mastodon checks the e-mail address passed by the provider to find an existing account. However, using the e-mail address alone means that if the authentication provider allows changing the e-mail address of an account, the Mastodon account can immediately be hijacked. All users logging in through external authentication providers are affected. The severity is medium, as it also requires the external authentication provider to misbehave. However, some well-known OIDC providers (like Microsoft Azure) make it very easy to accidentally allow unverified e-mail changes. Moreover, OpenID Connect also allows dynamic client registration. This issue has been addressed in versions 4.2.6, 4.1.14, 4.0.14, and 3.5.18. Users are advised to upgrade. There are no known workarounds for this vulnerability."}, {"lang": "es", "value": "Mastodon es un servidor de red social gratuito y de c\u00f3digo abierto basado en ActivityPub. Mastodon permite que nuevas identidades de proveedores de autenticaci\u00f3n configurados (CAS, SAML, OIDC) se adjunten a usuarios locales existentes con la misma direcci\u00f3n de correo electr\u00f3nico. Esto da como resultado una posible apropiaci\u00f3n de la cuenta si el proveedor de autenticaci\u00f3n permite cambiar la direcci\u00f3n de correo electr\u00f3nico o si se configuran varios proveedores de autenticaci\u00f3n. Cuando un usuario inicia sesi\u00f3n a trav\u00e9s de un proveedor de autenticaci\u00f3n externo por primera vez, Mastodon verifica la direcci\u00f3n de correo electr\u00f3nico transmitida por el proveedor para encontrar una cuenta existente. Sin embargo, usar solo la direcci\u00f3n de correo electr\u00f3nico significa que si el proveedor de autenticaci\u00f3n permite cambiar la direcci\u00f3n de correo electr\u00f3nico de una cuenta, la cuenta de Mastodon puede ser secuestrada inmediatamente. Todos los usuarios que inician sesi\u00f3n a trav\u00e9s de proveedores de autenticaci\u00f3n externos se ven afectados. La gravedad es media, ya que tambi\u00e9n requiere que el proveedor de autenticaci\u00f3n externo se comporte mal. Sin embargo, algunos proveedores de OIDC conocidos (como Microsoft Azure) hacen que sea muy f\u00e1cil permitir accidentalmente cambios de correo electr\u00f3nico no verificados. Adem\u00e1s, OpenID Connect tambi\u00e9n permite el registro din\u00e1mico de clientes. Este problema se solucion\u00f3 en las versiones 4.2.6, 4.1.14, 4.0.14 y 3.5.18. Se recomienda a los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad."}], "id": "CVE-2024-25618", "lastModified": "2026-06-17T07:16:18.300", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-25618", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-02-21T16:05:01.572129Z", "version": "2.0.3"}}]}, "published": "2024-02-14T21:15:08.410", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/mastodon/mastodon/commit/b31af34c9716338e4a32a62cc812d1ca59e88d15"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/mastodon/mastodon/security/advisories/GHSA-vm39-j3vx-pch3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/mastodon/mastodon/commit/b31af34c9716338e4a32a62cc812d1ca59e88d15"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/mastodon/mastodon/security/advisories/GHSA-vm39-j3vx-pch3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-306"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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