{"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\/da\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Udgivelsen af OpenSSH 8.6 med rettelse af s\u00e5rbarheder","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>OpenSSH 8.6 er blevet udgivet, en open source-implementering af klient og server til at arbejde med protokollerne SSH 2.0 og SFTP. I den nye version er der rettet en s\u00e5rbarhed i implementeringen af direktivet LogVerbose, som blev introduceret i den sidste udgave og gjorde det muligt at h\u00e6ve niveauet af den debug-information, der logges, herunder implementeringen af filtrering efter skabeloner, funktioner og filer relateret til kode, der k\u00f8rer med nedsatte privilegier i processen sshd, isoleret i et sandbox-milj\u00f8.      <\/p>\n<p>En angriber, der har opn\u00e5et kontrol over en ikke-privilegeret proces ved hj\u00e6lp af en endnu ukendt s\u00e5rbarhed, kan udnytte det relaterede LogVerbose-problem til at omg\u00e5 sandbox-isoleringen og udf\u00f8re angreb p\u00e5 processen, der k\u00f8rer med forh\u00f8jede privilegier. Anvendelsen af s\u00e5rbarheden i LogVerbose anses for at v\u00e6re usandsynlig i praksis, da LogVerbose-indstillingen er deaktiveret som standard og normalt kun bruges under fejls\u00f8gning. Desuden kr\u00e6ves det at finde en ny s\u00e5rbarhed i den ikke-privilegerede proces for at udf\u00f8re angrebet.    <\/p>\n<p>\u00c6ndringer i OpenSSH 8.6, der ikke er relateret til s\u00e5rbarheden:  <\/p>\n<ul>\n<li class=\"l\"> I sftp og sftp-server er der implementeret en ny protokoludvidelse &#171;limits@openssh.com&#187;, som giver mulighed for, at SFTP-klienten kan f\u00e5 oplysninger om de installerede p\u00e5 <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/da\/server\/dts-dronten\/\"   title=\"serveren\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">serveren<\/a> gr\u00e6nser, inklusive begr\u00e6nsninger for maksimal pakke- og l\u00e6se-\/skriveoperationer. I sftp bruges den nye udvidelse til at v\u00e6lge den optimale blokst\u00f8rrelse ved dataoverf\u00f8rsel.\n<li class=\"l\"> I sshd_config for sshd er der tilf\u00f8jet indstillingen ModuliFile, som g\u00f8r det muligt at angive stien til filen &#171;moduli&#187;, der indeholder grupper til DH-GEX.\n<li class=\"l\"> Der er tilf\u00f8jet en milj\u00f8variabel TEST_SSH_ELAPSED_TIMES til enhedstests for at aktivere udskrifter af den tid, der er g\u00e5et siden starten af hver test.\n<li class=\"l\"> Gr\u00e6nsefladen til anmodning af kodeord for GNOME er opdelt i to varianter, en til GNOME2 og en anden til GNOME3 (contrib\/gnome-ssk-askpass3.c). Varianten til GNOME3 bruger for at forbedre kompatibiliteten med Wayland kaldet gdk_seat_grab() til at styre indfangningen af tastaturet og musen.\n<li class=\"l\"> Der er tilf\u00f8jet en bl\u00f8d afvisning (soft-disallow) af systemopkaldet fstatat64 til det anvendte Linux-sandbox baseret p\u00e5 seccomp-bpf.    <\/ul>\n<p>Kilde: <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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