{"id":119889,"date":"2024-09-20T21:43:01","date_gmt":"2024-09-20T19:43:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-9-9-s-podderzhkoj-algoritma-postkvantovogo-shifrovaniya-ml-kem"},"modified":"2024-09-20T21:43:01","modified_gmt":"2024-09-20T19:43:01","slug":"reliz-openssh-9-9-s-podderzhkoj-algoritma-postkvantovogo-shifrovaniya-ml-kem","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/reliz-openssh-9-9-s-podderzhkoj-algoritma-postkvantovogo-shifrovaniya-ml-kem","title":{"rendered":"Lanzamiento de OpenSSH 9.9 con soporte para el algoritmo de cifrado post-cu\u00e1ntico ML-KEM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Se ha publicado la versi\u00f3n OpenSSH 9.9, una implementaci\u00f3n abierta del cliente y servidor para trabajar con los protocolos SSH 2.0 y SFTP. Principales cambios:  <\/p>\n<ul>\n<li class=\"l\"> En ssh y sshd se ha a\u00f1adido soporte para el algoritmo h\u00edbrido de intercambio de claves \u00abmlkem768x25519-sha256\u00bb, resistente a ataques de computadoras cu\u00e1nticas y que consiste en una combinaci\u00f3n de X25519 ECDH y el algoritmo ML-KEM (CRYSTALS-Kyber), recientemente estandarizado por el Instituto Nacional de Est\u00e1ndares y Tecnolog\u00eda de EE. UU. (NIST). ML-KEM utiliza m\u00e9todos de criptograf\u00eda basados en la resoluci\u00f3n de problemas de teor\u00eda de rejillas, cuyo tiempo de resoluci\u00f3n no difiere entre computadoras cl\u00e1sicas y cu\u00e1nticas.\n<li class=\"l\"> Se ha a\u00f1adido la palabra clave \u00abRefuseConnection\u00bb al archivo de configuraci\u00f3n sshd_config, con la cual sshd terminar\u00e1 las conexiones despu\u00e9s del primer intento de autenticaci\u00f3n. Se ha a\u00f1adido la clase \u00abrefuseconnection\u00bb a la directiva PerSourcePenalties, que se aplica al terminar la conexi\u00f3n tras activarse \u00abRefuseConnection\u00bb.\n<li class=\"l\"> El cliente ssh ha dejado de soportar la compresi\u00f3n de datos antes de la autenticaci\u00f3n, lo que aumenta significativamente la superficie de ataque en los servidores SSH y crea riesgos de ataques indirectos durante el proceso de autenticaci\u00f3n. En <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-newyork\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2785\">servidor<\/a> sshd, la compresi\u00f3n antes de la autenticaci\u00f3n se desactiv\u00f3 anteriormente.\n<li class=\"l\"> En ssh y sshd, al analizar los argumentos de la directiva \u00abMatch\u00bb se utilizan reglas similares a las de shell para trabajar con cadenas entre comillas, que soportan encapsulamientos anidados y escape mediante el s\u00edmbolo \u00ab\\\u00bb.\n<li class=\"l\"> En el archivo de configuraci\u00f3n ssh_config, en la directiva \u00abInclude\u00bb se ha asegurado el soporte para variables de entorno y sustituciones con \u00ab%\u00bb, de la misma manera que en la directiva \u00abMatch Exec\u00bb.\n<li class=\"l\"> En sshd_config se ha a\u00f1adido la opci\u00f3n \u00abinvalid-user\u00bb a la directiva Match, que se activa al intentar iniciar sesi\u00f3n con un nombre de usuario incorrecto.\n<li class=\"l\"> En ssh y sshd se ha implementado una versi\u00f3n m\u00e1s r\u00e1pida del algoritmo \u00abStreamlined NTRUPrime\u00bb. Para el algoritmo h\u00edbrido de intercambio de claves Streamlined NTRUPrime\/X25519 se ha a\u00f1adido la posibilidad de utilizar el nombre \u00absntrup761x25519-sha512\u00bb, adem\u00e1s del nombre espec\u00edfico de SSH \u00absntrup761x25519-sha512@openssh.com\u00bb.\n<li class=\"l\"> En ssh, sshd y ssh-agent se ha a\u00f1adido una protecci\u00f3n contra la fuga de claves privadas en archivos de volcado de n\u00facleo, funcionando en OpenBSD, Linux y FreeBSD.\n<li class=\"l\"> El manejo de claves se ha trasladado al uso de la API EVP_PKEY proporcionada por la biblioteca libcrypto.\n<li class=\"l\"> En sshd se ha a\u00f1adido un cambio aleatorio en el tiempo de espera de conexi\u00f3n (LoginGraceTime) de hasta 4 segundos para dificultar la detecci\u00f3n del tiempo de espera.\n<li class=\"l\"> Se han resuelto los problemas de compilaci\u00f3n con la biblioteca Musl.  <\/ul>\n<p>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61899\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 9.9, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0412 ssh \u0438 sshd \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0433\u0438\u0431\u0440\u0438\u0434\u043d\u043e\u0433\u043e \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 \u043e\u0431\u043c\u0435\u043d\u0430 \u043a\u043b\u044e\u0447\u0430\u043c\u0438 &#171;mlkem768x25519-sha256&#187;, \u0441\u0442\u043e\u0439\u043a\u043e\u0433\u043e \u043a \u043f\u043e\u0434\u0431\u043e\u0440\u0443 \u043d\u0430 \u043a\u0432\u0430\u043d\u0442\u043e\u0432\u043e\u043c \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u0435 \u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0441\u043e\u0431\u043e\u0439 \u043a\u043e\u043c\u0431\u0438\u043d\u0430\u0446\u0438\u044e \u0438\u0437 X25519 ECDH \u0438 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 ML-KEM (CRYSTALS-Kyber), \u043d\u0435\u0434\u0430\u0432\u043d\u043e \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u041d\u0430\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u043c \u0438\u043d\u0441\u0442\u0438\u0442\u0443\u0442\u043e\u043c \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043e\u0432 \u0438 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0439 \u0421\u0428\u0410 [&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-119889","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=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 9.9, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f 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