{"id":167221,"date":"2026-04-02T23:11:54","date_gmt":"2026-04-02T21:11:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-10-3"},"modified":"2026-04-04T11:22:40","modified_gmt":"2026-04-04T09:22:40","slug":"reliz-openssh-10-3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/reliz-openssh-10-3","title":{"rendered":"Vyd\u00e1n\u00ed OpenSSH 10.3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po p\u016fl roce v\u00fdvoje byl vyd\u00e1n OpenSSH 10.3, otev\u0159en\u00e1 implementace klienta a <a href=\"https:\/\/prohoster.info\/cs\/server\/\">serveru<\/a> pro pr\u00e1ci s protokoly SSH 2.0 a SFTP. Hlavn\u00ed zm\u011bny:<\/p>\n<ul>\n<li class=\"l\">Byla odstran\u011bna zranitelnost, kter\u00e1 umo\u017e\u0148ovala \u00fato\u010dn\u00edkovi, controlling username, p\u0159ed\u00e1van\u00e9 p\u0159i spu\u0161t\u011bn\u00ed utilit ssh, potenci\u00e1ln\u011b prov\u00e1d\u011bt libovoln\u00e9 shell p\u0159\u00edkazy. Zranitelnost se projevuje v syst\u00e9mech, kter\u00e9 pou\u017e\u00edvaj\u00ed substituci &#171;%u&#187; v n\u011bkter\u00fdch direktiv\u00e1ch konfigura\u010dn\u00edho souboru, jako je &#171;Match exec&#187;. Probl\u00e9m je zp\u016fsoben kontrolou speci\u00e1ln\u00edch znak\u016f v u\u017eivatelsk\u00e9m jm\u00e9nu v f\u00e1zi po proveden\u00ed %-substituc\u00ed v konfigura\u010dn\u00edm souboru ssh_config.<\/li>\n<li class=\"l\">Byl vy\u0159e\u0161en probl\u00e9m zabezpe\u010den\u00ed v sshd, zp\u016fsoben\u00fd nespr\u00e1vn\u00fdm porovn\u00e1n\u00edm mo\u017enosti authorized_keys principals=&#187;&#187; se seznamem jmen (principal) v certifik\u00e1tu v situaci, kdy jsou v jm\u00e9nech uvedeny znaky &#171;,&#187;. K tomu, aby bylo mo\u017en\u00e9 zranitelnost exploitovat, je nutn\u00e9, aby v mo\u017enosti authorized_keys principals=&#187;&#187; bylo uvedeno n\u011bkolik jmen a aby certifika\u010dn\u00ed \u00fa\u0159ad vystavil certifik\u00e1t s n\u011bkolika jm\u00e9ny odd\u011blen\u00fdmi \u010d\u00e1rkou (to obvykle nen\u00ed povoleno). Bylo zm\u011bn\u011bno chov\u00e1n\u00ed ohledn\u011b certifik\u00e1t\u016f s pr\u00e1zdn\u00fdm jm\u00e9nem &#8212; d\u0159\u00edve pr\u00e1zdn\u00e9 jm\u00e9no spadalo pod v\u0161echny mo\u017enosti authorized_keys principals=&#187;&#187;, nyn\u00ed u\u017e nespad\u00e1.<\/li>\n<li class=\"l\">Byl odstran\u011bn probl\u00e9m v scp, p\u0159i kter\u00e9m se po nahr\u00e1n\u00ed souboru s pr\u00e1vy root s pou\u017eit\u00edm mo\u017enosti &#171;-O&#187; a bez mo\u017enosti &#171;-p&#187; neodstra\u0148ovaly p\u0159\u00edznaky setuid\/setgid.<\/li>\n<li class=\"l\">Byl opraven probl\u00e9m v sshd p\u0159i zpracov\u00e1n\u00ed kl\u00ed\u010d\u016f ECDSA v direktiv\u00e1ch PubkeyAcceptedAlgorithms a HostbasedAcceptedAlgorithms, kv\u016fli kter\u00e9mu, pokud byl uveden jak\u00fdkoli algoritmus ECDSA (nap\u0159\u00edklad &#171;ecdsa-sha2-nistp384&#187;), za\u010daly b\u00fdt p\u0159ij\u00edm\u00e1ny i v\u0161echny ostatn\u00ed algoritmy zalo\u017een\u00e9 na ECDSA, i kdy\u017e nebyly v\u00fdslovn\u011b uvedeny v seznamu povolen\u00fdch.<\/li>\n<li class=\"l\">Byla p\u0159id\u00e1na podpora identifik\u00e1tor\u016f (codepoint) definovan\u00fdch IANA v specifikaci draft-ietf-sshm-ssh-agent pro ssh a sshd p\u0159i interakci s SSH-agenty. Podpora d\u0159\u00edve pou\u017e\u00edvan\u00fdch identifik\u00e1tor\u016f typu &#171;@openssh.com&#187; byla zachov\u00e1na.<\/li>\n<li class=\"l\">V ssh-agentu bylo implementov\u00e1no roz\u0161\u00ed\u0159en\u00ed &#171;query&#187;, definovan\u00e9 v specifikaci draft-ietf-sshm-ssh-agent, kter\u00e9 umo\u017e\u0148uje zjistit podporovan\u00e9 funkce agen. Pro dotaz na seznam podporovan\u00fdch roz\u0161\u00ed\u0159en\u00ed protokolu p\u0159es dotaz &#171;query&#187; byla do utilit ssh-add p\u0159id\u00e1na mo\u017enost &#171;-Q&#187;.<\/li>\n<li class=\"l\">V sshd_config bylo povoleno uveden\u00ed n\u011bkolika soubor\u016f v direktiv\u011b RevokedKeys a v ssh_config &#8212; v direktiv\u011b RevokedHostKeys.<\/li>\n<li class=\"l\">Do SSH byla p\u0159id\u00e1na escape p\u0159\u00edkaz \u201a~I\u2018 a volba \u201a-O conninfo\u2018 pro zobrazen\u00ed informac\u00ed o aktu\u00e1ln\u00edm spojen\u00ed, stejn\u011b jako volba \u201a-O channels\u2018 pro zobrazen\u00ed informac\u00ed o otev\u0159en\u00fdch kan\u00e1lech.<\/li>\n<li class=\"l\">V sshd byla v direktiv\u011b PerSourcePenalties implementov\u00e1na volba \u201ainvaliduser\u2018 pro p\u0159id\u00e1n\u00ed zpo\u017ed\u011bn\u00ed v p\u0159\u00edpad\u011b pokusu o p\u0159ihl\u00e1\u0161en\u00ed s neexistuj\u00edc\u00edm u\u017eivatelsk\u00fdm jm\u00e9nem (v\u00fdchoz\u00ed 5 sekund). Byla p\u0159id\u00e1na mo\u017enost uv\u00e1d\u011bt necel\u00e1 zpo\u017ed\u011bn\u00ed.<\/li>\n<li class=\"l\">Do sshd byla p\u0159id\u00e1na volba GSSAPIDelegateCredentials pro spr\u00e1vu p\u0159ij\u00edm\u00e1n\u00ed delegovan\u00fdch p\u0159ihla\u0161ovac\u00edch \u00fadaj\u016f poskytnut\u00fdch klientem.<\/li>\n<li class=\"l\">Do ssh-keygen byla p\u0159id\u00e1na podpora z\u00e1pisu kl\u00ed\u010d\u016f ED25519 v form\u00e1tu PKCS8.<\/li>\n<li class=\"l\">Byla p\u0159id\u00e1na podpora sch\u00e9matu digit\u00e1ln\u00edch podpis\u016f ed25519, implementovan\u00e1 p\u0159es libcrypto.<\/li>\n<\/ul>\n<p>Zdroj: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65126\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u043f\u043e\u043b\u0443\u0433\u043e\u0434\u0430 \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 10.3, \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: \u0423\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443, \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u0443\u044e\u0449\u0435\u043c\u0443 \u0438\u043c\u044f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u0435\u043c\u043e\u0435 \u043f\u0440\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0435 \u0443\u0442\u0438\u043b\u0438\u0442\u044b ssh, \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 shell-\u043a\u043e\u043c\u0430\u043d\u0434. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 &#171;%u&#187; \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432\u0430\u0445 \u0444\u0430\u0439\u043b\u0430 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438, \u0442\u0430\u043a\u0438\u0445 \u043a\u0430\u043a &#171;Match exec&#187;. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-167221","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=\"\u041f\u043e\u0441\u043b\u0435 \u043f\u043e\u043b\u0443\u0433\u043e\u0434\u0430 \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 10.3, \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 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\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.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/reliz-openssh-10-3","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-04-02T21:11:54+00:00","article:modified_time":"2026-04-04T09:22:40+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/167221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=167221"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/167221\/revisions"}],"predecessor-version":[{"id":167487,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/167221\/revisions\/167487"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=167221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=167221"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=167221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}