{"id":105214,"date":"2022-09-29T15:36:37","date_gmt":"2022-09-29T13:36:37","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah"},"modified":"2022-09-29T15:36:37","modified_gmt":"2022-09-29T13:36:37","slug":"kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","title":{"rendered":"Vulnerabilidades cr\u00edticas que comprometen el cifrado de extremo a extremo en muchos clientes de Matrix","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Los desarrolladores de la plataforma de comunicaciones descentralizadas Matrix han advertido sobre la detecci\u00f3n de vulnerabilidades cr\u00edticas en las bibliotecas matrix-js-sdk, matrix-ios-sdk y matrix-android-sdk2, que permiten a los administradores de servidores hacerse pasar por otros usuarios y leer mensajes en chats con cifrado de extremo a extremo (E2EE). Las vulnerabilidades son causadas por errores en implementaciones espec\u00edficas del protocolo Matrix y no representan problemas del propio protocolo. Actualmente, el proyecto ha lanzado actualizaciones para las SDK problem\u00e1ticas y para algunas de las aplicaciones cliente basadas en ellas.    <\/p>\n<p>Para llevar a cabo un ataque con \u00e9xito se requiere el acceso a un hogar controlado por el atacante <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-shicago\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2922\">servidor<\/a> (homeserver \u2014 servidor para almacenar el historial y las cuentas de los clientes). La implementaci\u00f3n de cifrado de extremo a extremo en el lado del cliente impide que el administrador <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-los-angeles\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3857\">servidores<\/a> interfiera en el intercambio de mensajes, pero las vulnerabilidades descubiertas permiten eludir esta protecci\u00f3n. Los problemas afectan al cliente principal de Matrix, Element (anteriormente Riot), para Web, sistemas de escritorio, iOS y Android, as\u00ed como a aplicaciones cliente de terceros, incluyendo Cinny, Beeper, SchildiChat, Circuli y Synod.im. Las vulnerabilidades no se manifiestan en las bibliotecas matrix-rust-sdk, hydrogen-sdk, Matrix Dart SDK, mautrix-python, mautrix-go y matrix-nio, as\u00ed como en las aplicaciones Hydrogen, ElementX, Nheko, FluffyChat, Syphon, Timmy, Gomuks y Pantalaimon.      <\/p>\n<p>Se destacan tres escenarios principales de ataque:  <\/p>\n<ul>\n<li class=\"l\"> El administrador del servidor Matrix puede interrumpir la verificaci\u00f3n basada en emoji (SAS, Short Authentication Strings) al utilizar firmas cruzadas y hacerse pasar por otro usuario. El problema es causado por una vulnerabilidad (CVE-2022-39250) en el c\u00f3digo de matrix-js-sdk relacionada con la mezcla en el procesamiento de identificadores de dispositivos y claves de firmas cruzadas.\n<li class=\"l\"> El atacante que controla el servidor puede falsificar un remitente de confianza y transmitir una clave falsa para interceptar mensajes de otros usuarios. El problema es causado por vulnerabilidades en matrix-js-sdk (CVE-2022-39251), matrix-ios-sdk (CVE-2022-39255) y matrix-android-sdk2 (CVE-2022-39248), que hacen que el cliente acepte incorrectamente mensajes dirigidos a dispositivos, cifrados utilizando el protocolo Megolm en lugar de Olm, atribuyendo los mensajes al remitente de Megolm, en lugar del remitente real.\n<li class=\"l\"> Al utilizar las vulnerabilidades mencionadas en el punto anterior, el administrador del servidor tambi\u00e9n puede agregar una clave de respaldo falsa en la cuenta del usuario para extraer las claves utilizadas para cifrar mensajes.    <\/ul>\n<p>Los investigadores que descubrieron la vulnerabilidad tambi\u00e9n demostraron ataques que llevan a a\u00f1adir a un usuario no autorizado al chat o a conectar un dispositivo ajeno al usuario. Los ataques se basan en el hecho de que los mensajes de servicio utilizados para a\u00f1adir usuarios al chat no est\u00e1n vinculados a las claves del creador del chat y pueden ser generados por el administrador del servidor. Los desarrolladores del proyecto Matrix clasificaron estas vulnerabilidades como menores, ya que tales manipulaciones no pasar\u00e1n desapercibidas \u2014 en caso de sustituci\u00f3n de un usuario, aparecer\u00e1 en la lista de usuarios del chat, y al a\u00f1adir un dispositivo se mostrar\u00e1 una advertencia, marcando el dispositivo como no verificado (adem\u00e1s, inmediatamente despu\u00e9s de a\u00f1adir el dispositivo suplantador, comenzar\u00e1n a transmitirse las claves compartidas necesarias para descifrar los mensajes).<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57844\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b \u0434\u0435\u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043c\u0443\u043d\u0438\u043a\u0430\u0446\u0438\u0439 Matrix \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0438 \u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 matrix-js-sdk, matrix-ios-sdk \u0438 matrix-android-sdk2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u0430\u043c \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0432\u044b\u0434\u0430\u0432\u0430\u0442\u044c \u0441\u0435\u0431\u044f \u0437\u0430 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438 \u0447\u0438\u0442\u0430\u0442\u044c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0432 \u0447\u0430\u0442\u0430\u0445 \u0441\u043e \u0441\u043a\u0432\u043e\u0437\u043d\u044b\u043c \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u043c (E2EE). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432\u044b\u0437\u0432\u0430\u043d\u044b \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 Matrix \u0438 \u043d\u0435 \u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u0441\u0430\u043c\u043e\u0433\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430. \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f, \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u0432\u044b\u043f\u0443\u0449\u0435\u043d\u044b \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043d\u044b\u0445 SDK [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-105214","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b \u0434\u0435\u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043c\u0443\u043d\u0438\u043a\u0430\u0446\u0438\u0439 Matrix 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comprometen el cifrado de extremo a extremo en muchos clientes de Matrix | ProHoster","description":"Los desarrolladores de la plataforma de comunicaciones descentralizadas Matrix han advertido sobre la detecci\u00f3n de vulnerabilidades cr\u00edticas en las bibliotecas matrix-js-sdk, matrix-ios-sdk y matrix-android-sdk2, que permiten a los administradores de servidores.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"es_ES","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS 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