{"id":112310,"date":"2023-12-19T03:10:31","date_gmt":"2023-12-19T01:10:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-9-6-c-ustraneniem-uyazvimostej"},"modified":"2023-12-19T03:10:31","modified_gmt":"2023-12-19T01:10:31","slug":"reliz-openssh-9-6-c-ustraneniem-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/reliz-openssh-9-6-c-ustraneniem-uyazvimostej","title":{"rendered":"OpenSSH 9.6 megjelen\u00e9se a sebezhet\u0151s\u00e9gek kik\u00fcsz\u00f6b\u00f6l\u00e9s\u00e9vel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent az OpenSSH 9.6, az SSH 2.0 \u00e9s SFTP protokollokhoz k\u00e9sz\u00fclt kliens \u00e9s szerver ny\u00edlt implement\u00e1ci\u00f3ja. Az \u00faj verzi\u00f3ban h\u00e1rom biztons\u00e1gi probl\u00e9m\u00e1t sz\u00fcntettek meg:     <\/p>\n<ul>\n<li class=\"l\"> Az SSH protokoll sebezhet\u0151s\u00e9ge (CVE-2023-48795, Terrapin t\u00e1mad\u00e1s) lehet\u0151v\u00e9 teszi, hogy MITM-t\u00e1mad\u00e1s sor\u00e1n a kapcsolatot vissza\u00e1ll\u00edts\u00e1k a kev\u00e9sb\u00e9 v\u00e9dett hiteles\u00edt\u00e9si algoritmusok haszn\u00e1lat\u00e1ra, \u00e9s letilts\u00e1k a t\u00e1mad\u00e1sok v\u00e9delm\u00e9t, amelyek a billenty\u0171zet megnyom\u00e1s k\u00f6z\u00f6tti k\u00e9sleltet\u00e9sek elemz\u00e9s\u00e9n kereszt\u00fcl rekre\u00e1lj\u00e1k a bevitel k\u00fcls\u0151 csatorn\u00e1kon. A t\u00e1mad\u00e1si m\u00f3dszert k\u00fcl\u00f6n h\u00edrben ismertetj\u00fck.\n<li class=\"l\"> Az ssh seg\u00e9dprogram sebezhet\u0151s\u00e9ge lehet\u0151v\u00e9 teszi tetsz\u0151leges shell-parancsok behelyettes\u00edt\u00e9s\u00e9t a bejelentkez\u00e9si \u00e9s hoszt\u00e9rt\u00e9kek manipul\u00e1ci\u00f3j\u00e1n kereszt\u00fcl, amely speci\u00e1lis karaktereket tartalmaz. A sebezhet\u0151s\u00e9g kihaszn\u00e1lhat\u00f3, ha a t\u00e1mad\u00f3 ellen\u0151rzi a bejelentkez\u00e9si \u00e9s hosztneveket, amelyeket az ssh, a ProxyCommand \u00e9s LocalCommand direkt\u00edv\u00e1k, vagy a \"match exec\" blokkok \u00e1tadnak, ahol a behelyettes\u00edt\u00e9si karakterek, p\u00e9ld\u00e1ul %u \u00e9s %h, meg vannak adva. P\u00e9ld\u00e1ul helytelen bejelentkez\u00e9si \u00e9s hosztnevek behelyettes\u00edt\u00e9sre ker\u00fclhetnek olyan rendszerekben, amelyek Git almodulokat haszn\u00e1lnak, mivel a Git nem tiltja a speci\u00e1lis karakterek megad\u00e1s\u00e1t a hoszt- \u00e9s felhaszn\u00e1l\u00f3nevekben. Hasonl\u00f3 sebezhet\u0151s\u00e9g figyelhet\u0151 meg a libssh-ben is.\n<li class=\"l\"> Hiba az ssh-agentben, amely miatt a PKCS#11 titkos kulcsok hozz\u00e1ad\u00e1sa sor\u00e1n a korl\u00e1toz\u00e1sok csak az els\u0151 kulcsra vonatkoztak, amit a PKCS#11 token visszaadott. A probl\u00e9ma nem \u00e9rinti a szok\u00e1sos titkos kulcsokat, FIDO tokeneket \u00e9s a korl\u00e1toz\u00e1sok n\u00e9lk\u00fcl megadott kulcsokat.  <\/ul>\n<p>A t\u00f6bbi v\u00e1ltoz\u00e1s:   <\/p>\n<ul>\n<li class=\"l\"> Az ssh-ba a '%j' behelyettes\u00edt\u00e9s ker\u00fclt bevezet\u00e9sre, amely a ProxyJump direkt\u00edv\u00e1n kereszt\u00fcl megadott hosztnevet b\u0151v\u00edti.\n<li class=\"l\"> Az ssh-hoz hozz\u00e1adva a ChannelTimeout kliens oldali konfigur\u00e1l\u00e1s\u00e1nak t\u00e1mogat\u00e1sa, amely felhaszn\u00e1lhat\u00f3 az inakt\u00edv csatorn\u00e1k lez\u00e1r\u00e1s\u00e1ra.\n<li class=\"l\"> Az ssh, sshd, ssh-add \u00e9s ssh-keygen t\u00e1mogatja az ED25519 titkos kulcsok PEM PKCS8 form\u00e1tumban t\u00f6rt\u00e9n\u0151 olvas\u00e1s\u00e1t (el\u0151z\u0151leg csak az OpenSSH form\u00e1tumot t\u00e1mogatt\u00e1k).\n<li class=\"l\"> Az ssh \u00e9s sshd protokollb\u0151v\u00edt\u00e9st kapott a digit\u00e1lis al\u00e1\u00edr\u00e1s hiteles\u00edt\u00e9si algoritmusainak \u00fajrat\u00e1rgyal\u00e1s\u00e1ra, amely az adatfelhaszn\u00e1l\u00f3n\u00e9v megszerz\u00e9s\u00e9t k\u00f6vet\u0151en t\u00f6rt\u00e9nik. P\u00e9ld\u00e1ul a b\u0151v\u00edtm\u00e9ny lehet\u0151v\u00e9 teszi m\u00e1s algoritmusok szelekt\u00edv haszn\u00e1lat\u00e1t a felhaszn\u00e1l\u00f3khoz val\u00f3 k\u00f6t\u0151d\u00e9ssel a 'Match user' blokkban a PubkeyAcceptedAlgorithms megad\u00e1s\u00e1val.\n<li class=\"l\"> Az ssh-add \u00e9s ssh-agent egy kiterjeszt\u00e9st kapott, amely lehet\u0151v\u00e9 teszi a PKCS#11 kulcsokkal kapcsolatos tan\u00fas\u00edtv\u00e1nyok haszn\u00e1lat\u00e1t az OpenSSH \u00f6sszes olyan seg\u00e9dprogramj\u00e1ban, amely t\u00e1mogatja az ssh-agentet, nem csup\u00e1n az ssh-ban.\n<li class=\"l\"> Fejlesztett\u00e9k az olyan t\u00e1mogatatlan vagy instabil ford\u00edt\u00f3i z\u00e1szl\u00f3k meghat\u00e1roz\u00e1s\u00e1t, mint a '-fzero-call-used-regs' a clang-ban.\n<li class=\"l\"> A sshd folyamat jogosults\u00e1gainak korl\u00e1toz\u00e1s\u00e1hoz az OpenSolaris verzi\u00f3kban, amelyek t\u00e1mogatj\u00e1k a getpflags() interf\u00e9szt, a PRIV_XPOLICY m\u00f3dot haszn\u00e1lt\u00e1k a PRIV_LIMIT helyett.      <\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60305\">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 9.6, \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\u044b \u0442\u0440\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e: \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 SSH (CVE-2023-48795, \u0430\u0442\u0430\u043a\u0430 &#171;Terrapin&#187;), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432 \u0445\u043e\u0434\u0435 MITM-\u0430\u0442\u0430\u043a\u0438 \u043e\u0442\u043a\u0430\u0442\u0438\u0442\u044c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043c\u0435\u043d\u0435\u0435 \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u044b\u0445 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u043e\u0432 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0438 \u043e\u0442\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0437\u0430\u0449\u0438\u0442\u0443 \u043e\u0442 \u0430\u0442\u0430\u043a \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c, \u0432\u043e\u0441\u0441\u043e\u0437\u0434\u0430\u044e\u0449\u0438\u043c \u0432\u0432\u043e\u0434 \u0447\u0435\u0440\u0435\u0437 [&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-112310","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 9.6, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 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forr\u00e1sk\u00f3d\u00fa kliens \u00e9s szerver.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/reliz-openssh-9-6-c-ustraneniem-uyazvimostej","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0420\u0435\u043b\u0438\u0437 OpenSSH 9.6 c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 | ProHoster","og:description":"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 9.6, 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