{"id":99965,"date":"2021-04-19T10:22:35","date_gmt":"2021-04-19T08:22:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti"},"modified":"2021-04-19T10:22:35","modified_gmt":"2021-04-19T08:22:35","slug":"reliz-openssh-8-6-s-ustraneniem-uyazvimosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Lanzamiento de OpenSSH 8.6 con correcci\u00f3n de vulnerabilidad","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Se ha publicado la versi\u00f3n OpenSSH 8.6, una implementaci\u00f3n abierta del cliente y servidor para trabajar con los protocolos SSH 2.0 y SFTP. En esta nueva versi\u00f3n se ha corregido una vulnerabilidad en la implementaci\u00f3n de la directiva LogVerbose, que apareci\u00f3 en la versi\u00f3n anterior y permit\u00eda aumentar el nivel de informaci\u00f3n de depuraci\u00f3n registrada en los logs, incluyendo la posibilidad de filtrar por patrones, funciones y archivos relacionados con el c\u00f3digo ejecutado con privilegios reducidos en el proceso sshd, aislado en un entorno sandbox.      <\/p>\n<p>Un atacante que logre controlar un proceso no privilegiado mediante alguna vulnerabilidad a\u00fan desconocida, puede utilizar el problema relacionado con LogVerbose para eludir la aislamiento de sandbox y atacar un proceso que se ejecuta con privilegios elevados. La explotaci\u00f3n de la vulnerabilidad en LogVerbose se considera poco probable en la pr\u00e1ctica, ya que la configuraci\u00f3n de LogVerbose est\u00e1 desactivada por defecto y generalmente solo se utiliza durante la depuraci\u00f3n. Adem\u00e1s, para realizar el ataque, se requiere encontrar una nueva vulnerabilidad en el proceso no privilegiado.    <\/p>\n<p>Cambios en OpenSSH 8.6 no relacionados con vulnerabilidades:  <\/p>\n<ul>\n<li class=\"l\"> En sftp y sftp-server se ha implementado una nueva extensi\u00f3n del protocolo \u00ablimits@openssh.com\u00bb, que permite al cliente SFTP obtener informaci\u00f3n sobre las configuraciones establecidas en <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-dronten\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">servidor<\/a> incluyendo l\u00edmites en el tama\u00f1o m\u00e1ximo de paquetes y operaciones de lectura y escritura. En sftp, la nueva extensi\u00f3n se utiliza para seleccionar el tama\u00f1o de bloque \u00f3ptimo durante la transferencia de datos.\n<li class=\"l\"> En sshd_config para sshd se ha a\u00f1adido la configuraci\u00f3n ModuliFile, que permite especificar la ruta al archivo \u00abmoduli\u00bb, que contiene grupos para DH-GEX.\n<li class=\"l\"> Se ha a\u00f1adido una variable de entorno TEST_SSH_ELAPSED_TIMES a las pruebas unitarias para habilitar la salida del tiempo transcurrido desde el inicio de cada prueba.\n<li class=\"l\"> La interfaz para solicitar contrase\u00f1as en GNOME se ha dividido en dos versiones, una para GNOME2 y otra para GNOME3 (contrib\/gnome-ssk-askpass3.c). La versi\u00f3n para GNOME3 mejorada para la compatibilidad con Wayland utiliza la llamada gdk_seat_grab() al manejar la captura del teclado y el rat\u00f3n.\n<li class=\"l\"> Se ha a\u00f1adido una prohibici\u00f3n suave (soft-disallow) de la llamada al sistema fstatat64 al sandbox aplicado en Linux basado en seccomp-bpf.    <\/ul>\n<p>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54986\">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 8.6, \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. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432\u044b LogVerbose, \u043f\u043e\u044f\u0432\u0438\u0432\u0448\u0435\u0439\u0441\u044f \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u0441\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0435\u043c\u043e\u0439 \u0432 \u043b\u043e\u0433 \u043e\u0442\u043b\u0430\u0434\u043e\u0447\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0448\u0430\u0431\u043b\u043e\u043d\u0430\u043c, \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c \u0438 \u0444\u0430\u0439\u043b\u0430\u043c, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u043c \u0441 \u043a\u043e\u0434\u043e\u043c, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u043c \u0441\u043e [&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-99965","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 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