{"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\/de\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Release von OpenSSH 8.6 mit Behebung einer Sicherheitsanf\u00e4lligkeit.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Die Ver\u00f6ffentlichung von OpenSSH 8.6, einer Open-Source-Implementierung des Clients und Servers f\u00fcr die Protokolle SSH 2.0 und SFTP, wurde bekannt gegeben. In der neuen Version wurde eine Schwachstelle in der Implementierung der Direktive LogVerbose behoben, die in der vorherigen Version aufgetreten war und es erm\u00f6glichte, die Menge an Debug-Informationen, die im Log gespeichert werden, zu erh\u00f6hen sowie Filterm\u00f6glichkeiten f\u00fcr Muster, Funktionen und Dateien zu realisieren, die mit Code ausgef\u00fchrt werden, der mit reduzierten Berechtigungen im sshd, isoliert in einer Sandbox-Umgebung, verbunden ist.      <\/p>\n<p>Ein Angreifer, der Kontrolle \u00fcber einen unprivilegierten Prozess durch eine noch unbekannte Schwachstelle erlangt hat, kann das mit LogVerbose verbundene Problem nutzen, um die Sandbox-Isolierung zu umgehen und einen Angriff auf einen mit erh\u00f6hten Berechtigungen laufenden Prozess durchzuf\u00fchren. Die Ausnutzung der Schwachstelle in LogVerbose wird in der Praxis als unwahrscheinlich angesehen, da die Standardkonfiguration von LogVerbose deaktiviert ist und normalerweise nur w\u00e4hrend der Fehlersuche verwendet wird. Zudem w\u00fcrde ein Angriff die Entdeckung einer neuen Schwachstelle im unprivilegierten Prozess erfordern.    <\/p>\n<p>\u00c4nderungen in OpenSSH 8.6, die nicht mit der Schwachstelle zusammenh\u00e4ngen:  <\/p>\n<ul>\n<li class=\"l\"> \u0412 sftp \u0438 sftp-server \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043e \u043d\u043e\u0432\u043e\u0435 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 &#171;limits@openssh.com&#187;, \u0434\u0430\u044e\u0449\u0435\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c SFTP-\u043a\u043b\u0438\u0435\u043d\u0442\u0443 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043d\u0430 <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/de\/server\/dts-dronten\/\"   title=\"Server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">Server<\/a> Beschr\u00e4nkungen zu erhalten, einschlie\u00dflich der Limits f\u00fcr die maximale Paketgr\u00f6\u00dfe sowie f\u00fcr Lese- und Schreiboperationen. Im sftp wird die neue Erweiterung genutzt, um die optimale Blockgr\u00f6\u00dfe beim Datentransfer auszuw\u00e4hlen.\n<li class=\"l\"> \u0412 sshd_config \u0434\u043b\u044f sshd \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 ModuliFile, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u043f\u0443\u0442\u044c \u043a \u0444\u0430\u0439\u043b\u0443 &#171;moduli&#187;, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0435\u043c\u0443 \u0433\u0440\u0443\u043f\u043f\u044b \u0434\u043b\u044f DH-GEX.\n<li class=\"l\"> Eine Umgebungsvariable TEST_SSH_ELAPSED_TIMES wurde zu den Unit-Tests hinzugef\u00fcgt, um die Ausgabe der Zeit zu aktivieren, die seit der Ausf\u00fchrung jedes Tests vergangen ist.\n<li class=\"l\"> Die Passwortabfrage-Schnittstelle f\u00fcr GNOME wurde in zwei Varianten unterteilt: eine f\u00fcr GNOME2 und eine f\u00fcr GNOME3 (contrib\/gnome-ssk-askpass3.c). Die Variante f\u00fcr GNOME3 verwendet zur Verbesserung der Kompatibilit\u00e4t mit Wayland den Aufruf von gdk_seat_grab() zur Verwaltung der Tastatur- und Mauseingabeverwaltung.\n<li class=\"l\"> In die unter Linux verwendete Sandbox auf Basis von seccomp-bpf wurde ein sanfter Verbot (soft-disallow) des Systemaufrufs fstatat64 hinzugef\u00fcgt.    <\/ul>\n<p>Quelle: <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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