{"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\/hu\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Az OpenSSH 8.6 megjelen\u00e9se a sebezhet\u0151s\u00e9g kijav\u00edt\u00e1s\u00e1val","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent az OpenSSH 8.6, az SSH 2.0 \u00e9s SFTP protokollokhoz k\u00e9sz\u00fclt ny\u00edlt forr\u00e1sk\u00f3d\u00fa kliens \u00e9s szerver \u00faj verzi\u00f3ja. Az \u00faj verzi\u00f3ban megsz\u00fcntett\u00e9k a LogVerbose direkt\u00edva megval\u00f3s\u00edt\u00e1s\u00e1hoz tartoz\u00f3 sebezhet\u0151s\u00e9get, amely a legut\u00f3bbi kiad\u00e1sban jelent meg, \u00e9s lehet\u0151v\u00e9 tette a napl\u00f3z\u00e1s sor\u00e1n kibocs\u00e1tott hibakeres\u00e9si inform\u00e1ci\u00f3k szintj\u00e9nek emel\u00e9s\u00e9t, bele\u00e9rtve a mint\u00e1k, funkci\u00f3k \u00e9s k\u00f3dhoz kapcsol\u00f3d\u00f3 f\u00e1jlok sz\u0171r\u00e9s\u00e9nek lehet\u0151s\u00e9g\u00e9t, amelyet a cs\u00f6kkentett jogosults\u00e1gokkal fut\u00f3 sshd im\u00e9nti lev\u00e1lasztott sandbox-k\u00f6rnyezetben val\u00f3s\u00edtottak meg.      <\/p>\n<p>A t\u00e1mad\u00f3, aki megszerezte a nem privilegiz\u00e1lt folyamat feletti ellen\u0151rz\u00e9st valamilyen eddig ismeretlen sebezhet\u0151s\u00e9g seg\u00edts\u00e9g\u00e9vel, kihaszn\u00e1lhatja a LogVerbose probl\u00e9m\u00e1t a sandbox-elk\u00fcl\u00f6n\u00edt\u00e9s megker\u00fcl\u00e9s\u00e9re, \u00e9s t\u00e1mad\u00e1st ind\u00edthat a magasabb jogosults\u00e1gokkal fut\u00f3 folyamat ellen. A LogVerbose sebezhet\u0151s\u00e9g gyakorlati alkalmaz\u00e1sa val\u00f3sz\u00edn\u0171tlennek \u00e9rt\u00e9kelhet\u0151, mivel a LogVerbose alap\u00e9rtelmezett be\u00e1ll\u00edt\u00e1sa ki van kapcsolva, \u00e9s \u00e1ltal\u00e1ban csak hiba\u00fczenetek \u00edr\u00e1sakor haszn\u00e1lj\u00e1k. A t\u00e1mad\u00e1shoz emellett sz\u00fcks\u00e9ges, hogy \u00faj sebezhet\u0151s\u00e9get tal\u00e1ljanak a nem privilegiz\u00e1lt folyamatban.    <\/p>\n<p>Az OpenSSH 8.6 nem sebezhet\u0151s\u00e9gi vonatkoz\u00e1s\u00fa v\u00e1ltoz\u00e1sai:  <\/p>\n<ul>\n<li class=\"l\"> Az sftp \u00e9s sftp-server \u00faj protokoll-kiterjeszt\u00e9st tartalmaz, amely a \u201elimits@openssh.com\u201d n\u00e9ven ismert, \u00e9s lehet\u0151v\u00e9 teszi az SFTP-kliens sz\u00e1m\u00e1ra, hogy inform\u00e1ci\u00f3kat kapjon a telep\u00edtett <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/dts-dronten\/\"   title=\"szerveren\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">szerveren<\/a> korl\u00e1toz\u00e1sokr\u00f3l, bele\u00e9rtve a maxim\u00e1lis csomagm\u00e9ret \u00e9s a \u00edr\u00e1si, olvas\u00e1si m\u0171veletek hat\u00e1rait. Az sftp \u00faj kiterjeszt\u00e9se lehet\u0151v\u00e9 teszi az optim\u00e1lis blokk m\u00e9ret\u00e9nek megv\u00e1laszt\u00e1s\u00e1t az adatok \u00e1tvitel\u00e9n\u00e9l.\n<li class=\"l\"> A sshd_config f\u00e1jlhoz \u00faj be\u00e1ll\u00edt\u00e1s, a ModuliFile ker\u00fclt hozz\u00e1ad\u00e1sra, amely lehet\u0151v\u00e9 teszi a DH-GEX csoportokat tartalmaz\u00f3 \u201emoduli\u201d f\u00e1jl el\u00e9r\u00e9si \u00fatj\u00e1nak megad\u00e1s\u00e1t.\n<li class=\"l\"> Az egys\u00e9gtesztekhez k\u00f6rnyezeti v\u00e1ltoz\u00f3k\u00e9nt hozz\u00e1adt\u00e1k a TEST_SSH_ELAPSED_TIMES-t, amely lehet\u0151v\u00e9 teszi, hogy megjelen\u00edtse az egyes tesztek fut\u00e1sa \u00f3ta eltelt id\u0151t.\n<li class=\"l\"> A GNOME jelsz\u00f3lek\u00e9r\u0151 fel\u00fclet k\u00e9t v\u00e1ltozatra lett beosztva, az egyik a GNOME2, a m\u00e1sik pedig a GNOME3 sz\u00e1m\u00e1ra (contrib\/gnome-ssk-askpass3.c). A GNOME3 eset\u00e9ben a Wayland kompatibilit\u00e1s\u00e1nak jav\u00edt\u00e1sa \u00e9rdek\u00e9ben a gdk_seat_grab() h\u00edv\u00e1s haszn\u00e1lat\u00e1val a billenty\u0171zet \u00e9s az eg\u00e9r elfog\u00e1s\u00e1nak kezel\u00e9s\u00e9re ker\u00fcl sor.\n<li class=\"l\"> A Linuxban haszn\u00e1lt seccomp-bpf alap\u00fa sandboxhoz egy l\u00e1gy megszor\u00edt\u00e1st (soft-disallow) adtak a fstatat64 rendszerh\u00edv\u00e1sra.    <\/ul>\n<p>Forr\u00e1s: <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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