{"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\/hr\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Izlaz OpenSSH 8.6 s ispravkom ranjivosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Objavljen je OpenSSH 8.6, otvorena implementacija klijenta i poslu\u017eitelja za rad s protokolima SSH 2.0 i SFTP. U novoj verziji ispravljena je ranjivost u implementaciji direktive LogVerbose, koja se pojavila u prethodnom izdanju i omogu\u0107ava pove\u0107anje koli\u010dine ispisanih podataka za otklanjanje pogre\u0161aka u log, uklju\u010duju\u0107i mogu\u0107nost filtriranja po obrascima, funkcijama i datotekama povezanim s kodom koji se izvr\u0161ava s smanjenim privilegijama u procesu sshd, izoliranog u sandbox okru\u017eenju.      <\/p>\n<p>Napada\u010d koji je stekao kontrolu nad neprivilegiranim procesom putem neke jo\u0161 nepoznate ranjivosti mo\u017ee iskoristiti problem vezan za LogVerbose kako bi zaobi\u0161ao sandbox izolaciju i izvr\u0161io napad na proces koji se izvr\u0161ava s povi\u0161enim privilegijama. Iskori\u0161tavanje ranjivosti u LogVerbose-u u praksi se ocjenjuje kao malo vjerojatno, budu\u0107i da je postavka LogVerbose prema zadanim postavkama isklju\u010dena i obi\u010dno se koristi samo tijekom otklanjanja pogre\u0161aka. Tako\u0111er, za napad je potrebno prona\u0107i novu ranjivost u neprivilegiranom procesu.    <\/p>\n<p>Promjene u OpenSSH 8.6 koje nisu povezane s ranjivostima:  <\/p>\n<ul>\n<li class=\"l\"> U sftp i sftp-serveru implementirano je novo pro\u0161irenje protokola \u00ablimits@openssh.com\u00bb, koje omogu\u0107uje SFTP-klijentu da dobije informacije o postavljenim na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/server\/dts-dronten\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">serveru<\/a> ograni\u010denjima, uklju\u010duju\u0107i limite na maksimalnu veli\u010dinu paketa i operacije pisanja i \u010ditanja. U sftp novo pro\u0161irenje se koristi za odabir optimalne veli\u010dine blokova prilikom prijenosa podataka.\n<li class=\"l\"> U sshd_config za sshd dodana je postavka ModuliFile, koja omogu\u0107ava da se odredi put do datoteke \u00abmoduli\u00bb, koja sadr\u017ei grupe za DH-GEX.\n<li class=\"l\"> U jedini\u010dne testove dodana je varijabla okru\u017eenja TEST_SSH_ELAPSED_TIMES za uklju\u010divanje ispisivanja vremena koje je pro\u0161lo od pokretanja svakog testa.\n<li class=\"l\"> Su\u010delje za zahtjev za lozinkom za GNOME podijeljeno je na dvije varijante, jednu za GNOME2, a drugu za GNOME3 (contrib\/gnome-ssk-askpass3.c). Opcija za GNOME3 kako bi se pobolj\u0161ala kompatibilnost s Waylandom koristi poziv gdk_seat_grab() prilikom upravljanja hvatanjem tipkovnice i mi\u0161a.\n<li class=\"l\"> U Linux sandbox temeljen na seccomp-bpf dodana je blaga zabrana (soft-disallow) sistemskog poziva fstatat64.    <\/ul>\n<p>Izvor: <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 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" 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