{"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\/cs\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Vyd\u00e1n\u00ed OpenSSH 8.6 s opravou zranitelnosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Bylo vyd\u00e1no OpenSSH 8.6, open-source implementace klienta a serveru pro pr\u00e1ci s protokoly SSH 2.0 a SFTP. V nov\u00e9 verzi byla opravena zranitelnost v implementaci direktivy LogVerbose, kter\u00e1 se objevila v p\u0159edchoz\u00edm vyd\u00e1n\u00ed a umo\u017e\u0148uje zv\u00fd\u0161it \u00farove\u0148 logov\u00e1n\u00ed lad\u00edc\u00edch informac\u00ed, v\u010detn\u011b mo\u017enosti filtrov\u00e1n\u00ed podle \u0161ablon, funkc\u00ed a soubor\u016f souvisej\u00edc\u00edch s k\u00f3dem, kter\u00fd je vykon\u00e1v\u00e1n s odebran\u00fdmi privilegiemi v procesu sshd, izolovan\u00e9m v sandboxov\u00e9m prost\u0159ed\u00ed.      <\/p>\n<p>\u00dato\u010dn\u00edk, kter\u00fd z\u00edsk\u00e1 kontrolu nad nepriviligovan\u00fdm procesem prost\u0159ednictv\u00edm n\u011bjak\u00e9 dosud nezn\u00e1m\u00e9 zranitelnosti, m\u016f\u017ee vyu\u017e\u00edt souvisej\u00edc\u00ed probl\u00e9m s LogVerbose k obejit\u00ed sandboxov\u00e9 izolace a proveden\u00ed \u00fatoku na proces b\u011b\u017e\u00edc\u00ed s vy\u0161\u0161\u00edmi privilegii. Vyu\u017eit\u00ed zranitelnosti LogVerbose se v praxi hodnot\u00ed jako nepravd\u011bpodobn\u00e9, jeliko\u017e je v\u00fdchoz\u00ed nastaven\u00ed LogVerbose vypnuto a obvykle se pou\u017e\u00edv\u00e1 pouze b\u011bhem lad\u011bn\u00ed. K \u00fatoku je tak\u00e9 nutn\u00e9 nal\u00e9zt novou zranitelnost v nepriviligovan\u00e9m procesu.    <\/p>\n<p>Zm\u011bny v OpenSSH 8.6, kter\u00e9 se net\u00fdkaj\u00ed zranitelnosti:  <\/p>\n<ul>\n<li class=\"l\"> V sftp a sftp-server byla implementov\u00e1na nov\u00e1 roz\u0161\u00ed\u0159en\u00ed protokolu \u201elimits@openssh.com\u201c, kter\u00e1 umo\u017e\u0148uje klientovi SFTP z\u00edskat informace o nastaven\u00fdch na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-dronten\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">serveru<\/a> omezen\u00edch, v\u010detn\u011b limit\u016f na maxim\u00e1ln\u00ed velikost paket\u016f a zapisovac\u00edch a \u010dtec\u00edch operac\u00ed. V sftp se nov\u00e9 roz\u0161\u00ed\u0159en\u00ed vyu\u017e\u00edv\u00e1 pro volbu optim\u00e1ln\u00ed velikosti blok\u016f p\u0159i p\u0159enosu dat.\n<li class=\"l\"> Do sshd_config pro sshd byla p\u0159id\u00e1na konfigurace ModuliFile, kter\u00e1 umo\u017e\u0148uje ur\u010dit cestu k souboru \u201emoduli\u201c, obsahuj\u00edc\u00edmu skupiny pro DH-GEX.\n<li class=\"l\"> Do jednotkov\u00fdch test\u016f byla p\u0159id\u00e1na prom\u011bnn\u00e1 prost\u0159ed\u00ed TEST_SSH_ELAPSED_TIMES pro zahrnut\u00ed v\u00fdstupu \u010dasu, kter\u00fd uplynul od spu\u0161t\u011bn\u00ed ka\u017ed\u00e9ho testu.\n<li class=\"l\"> Rozhran\u00ed pro dotaz na heslo pro GNOME bylo rozd\u011bleno na dv\u011b varianty, jednu pro GNOME2 a druhou pro GNOME3 (contrib\/gnome-ssk-askpass3.c). Varianta pro GNOME3 pro zlep\u0161en\u00ed kompatibility s Waylandem vyu\u017e\u00edv\u00e1 vol\u00e1n\u00ed gdk_seat_grab() p\u0159i spr\u00e1v\u011b zachycen\u00ed kl\u00e1vesnice a my\u0161i.\n<li class=\"l\"> Do pou\u017e\u00edvan\u00e9ho v Linuxu sandboxu zalo\u017een\u00e9ho na seccomp-bpf byl p\u0159id\u00e1n m\u011bkk\u00fd z\u00e1kaz (soft-disallow) syst\u00e9mov\u00e9ho vol\u00e1n\u00ed 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 5.0.3 - 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 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.\" \/>\n\t<meta name=\"robots\" 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