CVE-2022-39255

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To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched."}, {"lang": "es", "value": "Matrix iOS SDK permite a desarrolladores crear aplicaciones para iOS compatibles con Matrix. En versiones anteriores a 0.23.19, un atacante que coopere con un servidor dom\u00e9stico malicioso puede construir mensajes que parezcan leg\u00edtimamente proceder de otra persona, sin ninguna indicaci\u00f3n como un escudo gris. Adem\u00e1s, un atacante sofisticado que coopere con un servidor dom\u00e9stico malicioso podr\u00eda emplear esta vulnerabilidad para llevar a cabo un ataque dirigido con el fin de enviar mensajes falsos al dispositivo que parezcan proceder de otro usuario. Esto puede permitir, por ejemplo, inyectar el secreto de la copia de seguridad de la clave durante una autoverificaci\u00f3n, para hacer que un dispositivo objetivo comience a usar una copia de seguridad de la clave maliciosa falsificada por el servidor dom\u00e9stico. Estos ataques son posibles debido a una vulnerabilidad de confusi\u00f3n de protocolo que acepta mensajes to-device cifrados con Megolm en lugar de Olm. matrix-ios-sdk versi\u00f3n 0.23.19, ha sido modificada para aceptar \u00fanicamente mensajes to-device cifrados con Olm. Por precauci\u00f3n, han sido auditadas o a\u00f1adidas otras comprobaciones. 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. 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