{"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\/sk\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Vydanie OpenSSH 8.6 s opraven\u00edm zranite\u013enosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Bol vydan\u00fd OpenSSH 8.6, otvoren\u00e1 implement\u00e1cia klienta a servera pre pr\u00e1cu s protokolmi SSH 2.0 a SFTP. V novej verzii bola odstr\u00e1nen\u00e1 zranite\u013enos\u0165 v implement\u00e1cii pr\u00edkazu LogVerbose, ktor\u00e1 sa objavila v poslednom vydan\u00ed a umo\u017e\u0148ovala zv\u00fd\u0161i\u0165 \u00farove\u0148 zapisovan\u00fdch ladac\u00edch inform\u00e1ci\u00ed do logu, vr\u00e1tane mo\u017enosti filtrova\u0165 pod\u013ea vzorov, funkci\u00ed a s\u00faborov s\u00favisiacich s k\u00f3dom vykon\u00e1van\u00fdm so zn\u00ed\u017een\u00fdmi privil\u00e9giami v procese sshd, izolovanom v sandboxovom prostred\u00ed.      <\/p>\n<p>\u00dato\u010dn\u00edk, ktor\u00fd nadobudne kontrolu nad nepriviligovan\u00fdm procesom prostredn\u00edctvom inej zatia\u013e nezn\u00e1mej zranite\u013enosti, m\u00f4\u017ee vyu\u017ei\u0165 probl\u00e9m s\u00favisiaci s LogVerbose na ob\u00eddenie sandboxovej izol\u00e1cie a vykonanie \u00fatoku na proces s vy\u0161\u0161\u00edmi privil\u00e9giami. Vyu\u017eitie zranite\u013enosti v LogVerbose sa v praxi hodnot\u00ed ako nepravdepodobn\u00e9, preto\u017ee nastavenie LogVerbose je predvolene vypnut\u00e9 a zvy\u010dajne sa pou\u017e\u00edva len po\u010das ladenia. Rovnako je potrebn\u00e9 n\u00e1js\u0165 nov\u00fa zranite\u013enos\u0165 v nepriviligovanom procese na \u00faspe\u0161n\u00e9 vykonanie \u00fatoku.    <\/p>\n<p>Zmeny v OpenSSH 8.6, nes\u00favisiace so zranite\u013enos\u0165ou:  <\/p>\n<ul>\n<li class=\"l\"> V sftp a sftp-serveri bolo implementovan\u00e9 nov\u00e9 roz\u0161\u00edrenie protokolu \u201elimits@openssh.com\u201c, ktor\u00e9 umo\u017e\u0148uje SFTP klientovi z\u00edska\u0165 inform\u00e1cie o nastaven\u00fdch na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sk\/server\/dts-dronten\/\"   title=\"serveri\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">serveri<\/a> obmedzeniach, vr\u00e1tane limitov na maxim\u00e1lnu ve\u013ekos\u0165 paketu a oper\u00e1ci\u00ed z\u00e1pisu a \u010d\u00edtania. V sftp je nov\u00e9 roz\u0161\u00edrenie vyu\u017eit\u00e9 na v\u00fdber optim\u00e1lnej ve\u013ekosti blokov pri prenose \u00fadajov.\n<li class=\"l\"> V sshd_config pre sshd bola pridan\u00e1 konfigur\u00e1cia ModuliFile, ktor\u00e1 umo\u017e\u0148uje uvies\u0165 cestu k s\u00faboru \u201emoduli\u201c, ktor\u00fd obsahuje skupiny pre DH-GEX.\n<li class=\"l\"> Do jednotkov\u00fdch testov bola pridan\u00e1 premenn\u00e1 prostredia TEST_SSH_ELAPSED_TIMES na zapnutie zobrazovania \u010dasu, ktor\u00fd uplynul od spustenia ka\u017ed\u00e9ho testu.\n<li class=\"l\"> Rozhranie na po\u017eiadanie hesla pre GNOME bolo rozdelen\u00e9 na dva varianty, jeden pre GNOME2 a druh\u00fd pre GNOME3 (contrib\/gnome-ssk-askpass3.c). Variant pre GNOME3 pre zlep\u0161enie kompatibility s Wayland vyu\u017e\u00edva volanie gdk_seat_grab() pri spr\u00e1ve uchopenia kl\u00e1vesnice a my\u0161i.\n<li class=\"l\"> Do pou\u017e\u00edvan\u00e9ho v Linuxe sandboxu na b\u00e1ze seccomp-bpf bol pridan\u00fd m\u00e4kk\u00fd z\u00e1kaz (soft-disallow) syst\u00e9mov\u00e9ho volania fstatat64.    <\/ul>\n<p>Zdroj: <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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