{"id":182500,"date":"2026-07-07T04:53:59","date_gmt":"2026-07-07T02:54:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupen-openssh-10-4"},"modified":"2026-07-07T04:53:59","modified_gmt":"2026-07-07T02:54:00","slug":"dostupen-openssh-10-4","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/dostupen-openssh-10-4","title":{"rendered":"OpenSSH 10.4 je nyn\u00ed k dispozici","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po t\u0159ech m\u011bs\u00edc\u00edch v\u00fdvoje byla vyd\u00e1na verze OpenSSH 10.4, otev\u0159en\u00e9 implementace klienta a serveru pro pr\u00e1ci s protokoly SSH 2.0 a SFTP. Hlavn\u00ed zm\u011bny:  <\/p>\n<ul>\n<li class=\"l\"> Byla p\u0159id\u00e1na experiment\u00e1ln\u00ed podpora kombinovan\u00e9 sch\u00e9my vytv\u00e1\u0159en\u00ed digit\u00e1ln\u00edch podpis\u016f \u201emldsa44-ed25519\u201c, kter\u00e1 kombinuje postkvantov\u00fd algoritmus ML-DSA 44 a algoritmus zalo\u017een\u00fd na eliptick\u00fdch k\u0159ivk\u00e1ch Ed25519. Pro aktivaci podpory je t\u0159eba p\u0159idat \u201emldsa44-ed25519\u201c do direktiv HostKeyAlgorithms a PubkeyAcceptedAlgorithms. Pro generaci kl\u00ed\u010d\u016f lze pou\u017e\u00edt p\u0159\u00edkaz \u201essh-keygen -t mldsa44-ed25519\u201c.\n<li class=\"l\"> V ssh a sshd byla nasazena nov\u00e1 implementace syst\u00e9mu porovn\u00e1v\u00e1n\u00ed podle \u0161ablony, zalo\u017een\u00e1 na nedeterminovan\u00e9m kone\u010dn\u00e9m automatu, kter\u00e1 nen\u00ed n\u00e1chyln\u00e1 k probl\u00e9mu exponenci\u00e1ln\u00edho n\u00e1r\u016fstu slo\u017eitosti v\u00fdpo\u010dt\u016f p\u0159i pou\u017e\u00edv\u00e1n\u00ed masek obsahuj\u00edc\u00edch v\u00edce symbol\u016f \u201e*\u201c.\n<li class=\"l\"> Bylo zm\u011bn\u011bno chov\u00e1n\u00ed linuxov\u00fdch sestaven\u00ed sshd s povolen\u00fdm filtrov\u00e1n\u00edm syst\u00e9mov\u00fdch vol\u00e1n\u00ed pomoc\u00ed seccomp. D\u0159\u00edve vedlo selh\u00e1n\u00ed p\u0159i aktivaci SECCOMP nebo NO_NEW_PRIVS na linuxov\u00fdch syst\u00e9mech bez jejich podpory k z\u00e1znamu upozorn\u011bn\u00ed do protokolu a pokra\u010dov\u00e1n\u00ed v \u010dinnosti bez izolace, nyn\u00ed to povede k havarijn\u00edmu ukon\u010den\u00ed.\n<li class=\"l\"> P\u0159i pou\u017eit\u00ed volby \u201esshd -G\u201c v dumpu konfigurace se nyn\u00ed direktivy zapisuj\u00ed s pou\u017eit\u00edm velk\u00fdch a mal\u00fdch p\u00edsmen, m\u00edsto aby se zapisovaly pouze mal\u00fdmi p\u00edsmeny (tj. \u201ePubkeyAuthentication\u201c m\u00edsto \u201epubkeyauthentication\u201c).\n<li class=\"l\"> Chov\u00e1n\u00ed ssh a sshd bylo p\u0159izp\u016fsobeno standardu RFC 4253: odesl\u00e1n\u00ed zpr\u00e1v nesouvisej\u00edc\u00edch s v\u00fdm\u011bnou kl\u00ed\u010d\u016f b\u011bhem op\u011btovn\u00e9 v\u00fdm\u011bny kl\u00ed\u010d\u016f nyn\u00ed povede k ukon\u010den\u00ed spojen\u00ed. D\u0159\u00edve mohli \u00fato\u010dn\u00edci prov\u00e1d\u011bt \u00fatoky DoS, kdy\u017e nekone\u010dn\u011b odes\u00edlali b\u011bhem v\u00fdm\u011bny kl\u00ed\u010d\u016f ciz\u00ed zpr\u00e1vy, kter\u00e9 se ukl\u00e1daly do vyrovn\u00e1vac\u00ed pam\u011bti a <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-dronten\/\" title=\"serveru\" data-wpil-keyword-link=\"linked\">serveru<\/a> spot\u0159ebov\u00e1valy pam\u011b\u0165.            <\/ul>\n<p>Bylo odstran\u011bno n\u011bkolik bezpe\u010dnostn\u00edch probl\u00e9m\u016f:  <\/p>\n<ul>\n<li class=\"l\"> V utilit\u011b ssh bylo odstran\u011bno potenci\u00e1ln\u00ed dereference pam\u011bti po jej\u00edm uvoln\u011bn\u00ed (use-after-free) p\u0159i interakci se \u0161kodliv\u00fdm <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-shicago\/\" title=\"serveru\" data-wpil-keyword-link=\"linked\">serveru<\/a>. Probl\u00e9m je zneu\u017eiteln\u00fd prost\u0159ednictv\u00edm zm\u011bny hostitelsk\u00e9ho kl\u00ed\u010de b\u011bhem op\u011btovn\u00e9 v\u00fdm\u011bny kl\u00ed\u010d\u016f.\n<li class=\"l\"> Zranitelnost v sftp, kter\u00e1 umo\u017e\u0148uje nahr\u00e1n\u00ed souboru do jin\u00e9 adres\u00e1\u0159e p\u0159i p\u0159ipojen\u00ed k \u0161kodliv\u00e9mu serveru pomoc\u00ed p\u0159\u00edkazu ve form\u011b \u201esftp host:\/path .\u201c.\n<li class=\"l\"> Zranitelnost v scp, kter\u00e1 umo\u017e\u0148uje p\u0159i kop\u00edrov\u00e1n\u00ed soubor\u016f mezi dv\u011bma extern\u00edmi <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-dusseldorf\/\" title=\"servery\" data-wpil-keyword-link=\"linked\">servery<\/a>, jeden z nich\u017e je pod kontrolou \u00fato\u010dn\u00edka, uspo\u0159\u00e1dat z\u00e1znamy soubor\u016f do nad\u0159azen\u00e9ho adres\u00e1\u0159e, kter\u00fd je o \u00farove\u0148 n\u00ed\u017ee ne\u017e c\u00edlov\u00fd adres\u00e1\u0159.\n<li class=\"l\"> Byl vy\u0159e\u0161en probl\u00e9m v sshd, kter\u00fd se projevoval p\u0159i pou\u017e\u00edv\u00e1n\u00ed intern\u00ed implementace SFTP serveru (\u201einternal-sftp\u201c), kter\u00e1 je ve v\u00fdchoz\u00edm nastaven\u00ed vypnuta. Probl\u00e9m souvis\u00ed s od\u0159ez\u00e1v\u00e1n\u00edm dlouh\u00fdch sekvenc\u00ed v p\u0159\u00edkazov\u00e9m \u0159\u00e1dku po dev\u00e1t\u00e9m argumentu, co\u017e vede k vynech\u00e1n\u00ed n\u00e1sleduj\u00edc\u00edch argument\u016f. T\u00edm mohou b\u00fdt potenci\u00e1ln\u011b vynech\u00e1ny volby souvisej\u00edc\u00ed s bezpe\u010dnost\u00ed.\n<li class=\"l\"> V sshd byla odstran\u011bna chyba, kv\u016fli kter\u00e9 direktiva \u201eDisableForwarding=yes\u201c nezakazovala mo\u017enost vytv\u00e1\u0159en\u00ed tunel\u016f povolen\u00fdch volbou \u201ePermitTunnel=yes\u201c (ve v\u00fdchoz\u00edm nastaven\u00ed nen\u00ed nastavena).\n<li class=\"l\"> V sshd byla vy\u0159e\u0161ena problematika, kterou lze vyu\u017e\u00edt k iniciaci odm\u00edtnut\u00ed slu\u017eeb v p\u0159edautentiza\u010dn\u00ed f\u00e1zi p\u0159i aktivaci direktivy GSSAPIAuthentication (ve v\u00fdchoz\u00edm nastaven\u00ed je vypnuta). Probl\u00e9m nen\u00ed blokov\u00e1n limitem \u201eMaxAuthTries\u201c, ale spad\u00e1 pod omezen\u00ed \u201ePerSourcePenalties\u201c.\n<li class=\"l\"> V sshd byly odstran\u011bny nedostatky, kv\u016fli nim\u017e nebyla v\u017edy p\u0159id\u00e1na minim\u00e1ln\u00ed prodleva mezi pokusy o autentizaci.        <\/ul>\n<p>Zdroj: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65854\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0442\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a OpenSSH 10.4, \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. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u0430\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043a\u043e\u043c\u0431\u0438\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0441\u0445\u0435\u043c\u044b \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 &#171;mldsa44-ed25519&#187;, \u0441\u043e\u0447\u0435\u0442\u0430\u044e\u0449\u0438\u0439 \u043f\u043e\u0441\u0442\u043a\u0432\u0430\u043d\u0442\u043e\u0432\u044b\u0439 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c ML-DSA 44 \u0438 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c \u043d\u0430 \u0431\u0430\u0437\u0435 \u044d\u043b\u043b\u0438\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u043a\u0440\u0438\u0432\u044b\u0445 Ed25519. \u0414\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c &#171;mldsa44-ed25519&#187; \u0432 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432\u044b HostKeyAlgorithms \u0438 PubkeyAcceptedAlgorithms. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-182500","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u043e\u0441\u043b\u0435 \u0442\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a OpenSSH 10.4, \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 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