CVE-2022-39257

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The default policy for accepting key forwards has been made more strict in the matrix-ios-sdk version 0.23.19. matrix-ios-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround."}, {"lang": "es", "value": "Matrix iOS SDK permite a los desarrolladores crear aplicaciones para iOS compatibles con Matrix. En versiones anteriores a 0.23.19, un atacante que colabore con un servidor dom\u00e9stico malicioso puede construir mensajes que parezcan proceder de otra persona. Dichos mensajes estar\u00e1n marcados con un escudo gris en algunas plataformas, pero \u00e9ste puede faltar en otras. Este ataque es posible debido a que el matrix-ios-sdk implementa una estrategia de reenv\u00edo de claves demasiado permisiva. La pol\u00edtica por defecto para aceptar reenv\u00edos de claves se ha hecho m\u00e1s estricta en matrix-ios-sdk versi\u00f3n 0.23.19. matrix-ios-sdk ahora s\u00f3lo aceptar\u00e1 claves reenviadas en respuesta a peticiones previamente emitidas y s\u00f3lo desde dispositivos propios y verificados. El SDK ahora establece un flag \"trusted\" en el mensaje descifrado al descifrarlo, bas\u00e1ndose en si la clave usada para descifrar el mensaje fue recibida de una fuente confiable. Los clientes deben asegurarse de que los mensajes descifrados con una clave con \"trusted = false\" sean decorados apropiadamente (por ejemplo, mostrando una advertencia para tales mensajes). Este ataque requiere la coordinaci\u00f3n entre un servidor dom\u00e9stico malicioso y un atacante, por lo que aquellos que conf\u00edan en sus servidores dom\u00e9sticos no necesitan una mitigaci\u00f3n"}], "id": "CVE-2022-39257", "lastModified": "2026-06-17T04:58:00.830", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-39257", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-04-23T15:50:39.526542Z", "version": "2.0.3"}}]}, "published": "2022-09-28T21:15:14.397", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c"}, {"source": "security-advisories@github.com", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}, {"lang": "en", "value": "CWE-322"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-287"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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