{"id":103424,"date":"2022-02-24T15:36:49","date_gmt":"2022-02-24T13:36:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-9-s-ustraneniem-uyazvimosti-v-sshd"},"modified":"2022-02-24T15:36:49","modified_gmt":"2022-02-24T13:36:49","slug":"reliz-openssh-8-9-s-ustraneniem-uyazvimosti-v-sshd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/reliz-openssh-8-9-s-ustraneniem-uyazvimosti-v-sshd","title":{"rendered":"Az OpenSSH 8.9-es verzi\u00f3 kiad\u00e1sa, amely jav\u00edtja az sshd sebezhet\u0151s\u00e9g\u00e9t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Hat h\u00f3napos fejleszt\u00e9s ut\u00e1n bemutat\u00e1sra ker\u00fclt az OpenSSH 8.9, a SSH 2.0 \u00e9s SFTP protokollokhoz k\u00e9sz\u00fclt ny\u00edlt kliens \u00e9s szerver implement\u00e1ci\u00f3ja. Az \u00faj verzi\u00f3ban az sshd-ben jav\u00edtott\u00e1k az a sebezhet\u0151s\u00e9get, amely potenci\u00e1lisan hozz\u00e1f\u00e9r\u00e9st tesz lehet\u0151v\u00e9 hiteles\u00edt\u00e9s n\u00e9lk\u00fcl. A probl\u00e9ma egy eg\u00e9sz sz\u00e1m t\u00falcsordul\u00e1s\u00e1b\u00f3l ered az autentik\u00e1l\u00e1si k\u00f3dban, de a kihaszn\u00e1l\u00e1s csak m\u00e1s logikai hib\u00e1k egy\u00fcttese mellett lehets\u00e9ges a k\u00f3dban.    <\/p>\n<p> A jelenlegi form\u00e1j\u00e1ban a sebezhet\u0151s\u00e9g nem kiakn\u00e1zott, ha a jogosults\u00e1gmegoszt\u00e1si m\u00f3d be van kapcsolva, mivel megnyilv\u00e1nul\u00e1s\u00e1t k\u00fcl\u00f6n ellen\u0151rz\u00e9sek akad\u00e1lyozz\u00e1k meg, amelyeket a jogosults\u00e1gmegoszt\u00e1si k\u00f3d v\u00e9gez. A jogosults\u00e1gmegoszt\u00e1si m\u00f3d alap\u00e9rtelmez\u00e9s szerint 2002 \u00f3ta akt\u00edv, az OpenSSH 3.2.2 \u00f3ta, \u00e9s k\u00f6telez\u0151 az OpenSSH 7.5 kiad\u00e1s \u00f3ta, amely 2017-ben jelent meg. Ezen k\u00edv\u00fcl a hordozhat\u00f3 OpenSSH-verzi\u00f3k 6.5-\u00f6s verzi\u00f3t\u00f3l (2014) a sebezhet\u0151s\u00e9g m\u00e1r a t\u00falcsordul\u00e1s elleni v\u00e9delmi jelz\u0151k bekapcsol\u00e1s\u00e1val le van blokkolva.       <\/p>\n<p>Egy\u00e9b v\u00e1ltoz\u00e1sok:  <\/p>\n<ul>\n<li class=\"l\"> A hordozhat\u00f3 OpenSSH-ben az sshd-ben elt\u00e1vol\u00edtott\u00e1k a jelszavak MD5 algoritmus \u00e1ltali hashel\u00e9s\u00e9nek be\u00e9p\u00edtett t\u00e1mogat\u00e1s\u00e1t (a visszat\u00e9r\u00e9shez k\u00fcls\u0151 k\u00f6nyvt\u00e1rakkal, p\u00e9ld\u00e1ul libxcrypt-tel val\u00f3 \u00f6sszekapcsol\u00e1s enged\u00e9lyezett).\n<li class=\"l\"> Az ssh, sshd, ssh-add \u00e9s ssh-agent megval\u00f3s\u00edtotta azt az alrendszert, amely korl\u00e1tozza a ssh-agentbe hozz\u00e1adott kulcsok tov\u00e1bb\u00edt\u00e1s\u00e1t \u00e9s haszn\u00e1lat\u00e1t. Ez az alrendszer lehet\u0151v\u00e9 teszi szab\u00e1lyok megad\u00e1s\u00e1t, amelyek meghat\u00e1rozz\u00e1k, hogyan \u00e9s hol haszn\u00e1lhat\u00f3k a kulcsok a ssh-agentben. P\u00e9ld\u00e1ul a k\u00f6vetkez\u0151 parancsot haszn\u00e1lhatjuk egy olyan kulcs hozz\u00e1ad\u00e1s\u00e1hoz, amelyet csak felhaszn\u00e1l\u00f3i azonos\u00edt\u00e1sra haszn\u00e1lhatunk, amikor b\u00e1rmely felhaszn\u00e1l\u00f3 csatlakozik a scylla.example.org hosztra, a perseus felhaszn\u00e1l\u00f3 a cetus.example.org hosztra, \u00e9s a medea felhaszn\u00e1l\u00f3 a charybdis.example.org hosztra, a scylla.example.org k\u00f6zbens\u0151 hoszton kereszt\u00fcl: $ ssh-add -h &#171;perseus@cetus.example.org&#187; &#092; -h &#171;scylla.example.org&#187; &#092; -h &#171;scylla.example.org&gt;medea@charybdis.example.org&#187; &#092; ~\\\/ .ssh\\\/id_ed25519\n<li class=\"l\"> Az ssh \u00e9s sshd KexAlgorithms list\u00e1j\u00e1ba, amely az \u00f6sszes m\u00f3dszer kiv\u00e1laszt\u00e1si sorrendj\u00e9t hat\u00e1rozza meg, alap\u00e9rtelmez\u00e9s szerint hozz\u00e1 lett adva egy hibrid algoritmus &#171;sntrup761x25519-sha512@openssh.com&#187; (ECDH\/x25519 + NTRU Prime), amely ellen\u00e1ll a kvantumsz\u00e1m\u00edt\u00f3g\u00e9pekkel v\u00e9gzett pr\u00f3b\u00e1lkoz\u00e1soknak. Az OpenSSH 8.9 verzi\u00f3j\u00e1ban ez a meg\u00e1llapod\u00e1si m\u00f3dszer az ECDH \u00e9s DH m\u00f3dszerek k\u00f6z\u00f6tt lett bevezetve, de a k\u00f6vetkez\u0151 kiad\u00e1sban alap\u00e9rtelmezett\u00e9 tervezik tenni.\n<li class=\"l\"> Az ssh-keygen, ssh \u00e9s ssh-agent jav\u00edtott\u00e1k a FIDO-tokenek kezel\u00e9s\u00e9t, melyek az eszk\u00f6z azonos\u00edt\u00e1s\u00e1hoz haszn\u00e1ltak, bele\u00e9rtve a biometrikus azonos\u00edt\u00e1shoz sz\u00fcks\u00e9ges kulcsokat.\n<li class=\"l\"> Az ssh-keygen-hez hozz\u00e1 lett adva a &#171;ssh-keygen -Y match-principals&#187; parancs a felhaszn\u00e1l\u00f3k neveinek ellen\u0151rz\u00e9s\u00e9re a megengedett nevek list\u00e1j\u00e1t tartalmaz\u00f3 f\u00e1jlban.\n<li class=\"l\"> Az ssh-add \u00e9s ssh-agent lehet\u0151v\u00e9 teszi FIDO-kulcsok PIN-k\u00f3ddal v\u00e9dett hozz\u00e1ad\u00e1s\u00e1t az ssh-agenthez (a PIN-k\u00f3dot az azonos\u00edt\u00e1s sor\u00e1n k\u00e9rik).\n<li class=\"l\"> Az ssh-keygen programban lehet\u0151s\u00e9g van hash algoritmus (sha512 vagy sha256) kiv\u00e1laszt\u00e1s\u00e1ra az al\u00e1\u00edr\u00e1s l\u00e9trehoz\u00e1sakor.\n<li class=\"l\"> Az ssh \u00e9s sshd teljes\u00edtm\u00e9nyjav\u00edt\u00e1sa \u00e9rdek\u00e9ben a h\u00e1l\u00f3zati adatok k\u00f6zvetlen\u00fcl a bej\u00f6v\u0151 csomagok puffereibe ker\u00fclnek, megker\u00fclve a k\u00f6zbens\u0151 puffert a veremben. Hasonl\u00f3an val\u00f3s\u00edtott\u00e1k meg a be\u00e9rkez\u0151 adatok k\u00f6zvetlen elhelyez\u00e9s\u00e9t a csatornapufferben.\n<li class=\"l\"> Az ssh-ben a PubkeyAuthentication direkt\u00edv\u00e1ban kib\u0151v\u00edtett\u00e9k a t\u00e1mogatott param\u00e9terek list\u00e1j\u00e1t (yes|no|unbound|host-bound), hogy lehet\u0151s\u00e9get biztos\u00edtsanak a haszn\u00e1lt protokoll-kiterjeszt\u00e9s kiv\u00e1laszt\u00e1s\u00e1ra.      <\/ul>\n<p>A k\u00f6vetkez\u0151 kiad\u00e1sokban v\u00e1rhat\u00f3, hogy az scp utilit\u00e1s alap\u00e9rtelmezettk\u00e9nt SFTP-re v\u00e1lt a r\u00e9gi SCP\/RCP protokoll helyett. Az SFTP el\u0151re meghat\u00e1rozott m\u00f3dszereket alkalmaz a f\u00e1jlnevek kezel\u00e9s\u00e9re, \u00e9s nem haszn\u00e1l glob-mint\u00e1k feldolgoz\u00e1s\u00e1t a h\u00e1tt\u00e9rben l\u00e9v\u0151 m\u00e1sik g\u00e9pen, ami biztons\u00e1gi probl\u00e9m\u00e1kat okoz. K\u00fcl\u00f6n\u00f6sen az SCP \u00e9s RCP alkalmaz\u00e1sakor a szerver d\u00f6nt arr\u00f3l, hogy mely f\u00e1jlokat \u00e9s k\u00f6nyvt\u00e1rakat k\u00fcldje el az \u00fcgyf\u00e9lnek, m\u00edg az \u00fcgyf\u00e9l csup\u00e1n ellen\u0151rzi a visszaadott objektumok neveinek helyess\u00e9g\u00e9t, ami megfelel\u0151 ellen\u0151rz\u00e9sek hi\u00e1ny\u00e1ban lehet\u0151v\u00e9 teszi <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/dts-shicago\/\"   title=\"szerverhez\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2906\">szerverhez<\/a> m\u00e1s f\u00e1jlneveket \u00e1tadni, amelyek elt\u00e9rnek a k\u00e9rt nevekt\u0151l. Az SFTP protokoll mentes a megjel\u00f6lt probl\u00e9m\u00e1kt\u00f3l, de nem t\u00e1mogatja a speci\u00e1lis utak felfed\u00e9s\u00e9t, mint p\u00e9ld\u00e1ul a &#171;~\\\/&#187;. A k\u00fcl\u00f6nbs\u00e9g megsz\u00fcntet\u00e9s\u00e9re a kor\u00e1bbi OpenSSH kiad\u00e1sban egy \u00faj SFTP protokoll kiterjeszt\u00e9st javasoltak az ~\\\/ \u00e9s ~user\\\/ utak felfed\u00e9s\u00e9re.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56751\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0448\u0435\u0441\u0442\u0438 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.9, \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 \u0432 sshd \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u0431\u0435\u0437 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u044b\u043c \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435\u043c \u0432 \u043a\u043e\u0434\u0435 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0441\u043e\u0447\u0435\u0442\u0430\u043d\u0438\u0438 \u0441 \u0434\u0440\u0443\u0433\u0438\u043c\u0438 \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u043c\u0438 \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043a\u043e\u0434\u0435. \u0412 \u0442\u0435\u043a\u0443\u0449\u0435\u043c [&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-103424","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All 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property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2022-02-24T13:36:49+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2022-02-24T13:36:49+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Az OpenSSH 8.9 kiad\u00e1s, amely tartalmazza a biztons\u00e1gi r\u00e9s jav\u00edt\u00e1s\u00e1t az sshd-ben | ProHoster","description":"Hat h\u00f3napos fejleszt\u00e9s ut\u00e1n bemutatt\u00e1k az OpenSSH 8.9 kiad\u00e1s\u00e1t, amely egy ny\u00edlt \u00fcgyf\u00e9l- \u00e9s szervermegold\u00e1s SSH 2.0 \u00e9s SFTP 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