Po \u0161esti m\u011bs\u00edc\u00edch v\u00fdvoje byl p\u0159edstaven release OpenSSH 8.9, open-source realizace klienta a serveru pro pr\u00e1ci s protokoly SSH 2.0 a SFTP. V nov\u00e9 verzi bylo ve sshd opraveno zranitelnost, kter\u00e1 potenci\u00e1ln\u011b umo\u017e\u0148uje p\u0159\u00edstup bez autentizace. Probl\u00e9m je zp\u016fsoben p\u0159ete\u010den\u00edm celo\u010d\u00edseln\u00e9 prom\u011bnn\u00e9 v autentiza\u010dn\u00edm k\u00f3du, ale jeho zneu\u017eit\u00ed je mo\u017en\u00e9 pouze v kombinaci s jin\u00fdmi logick\u00fdmi chybami v k\u00f3du. <\/p>\n
V aktu\u00e1ln\u00edm stavu nen\u00ed zranitelnost zneu\u017eiteln\u00e1, pokud je povolen re\u017eim d\u011blen\u00ed opr\u00e1vn\u011bn\u00ed, proto\u017ee jej\u00ed projev blokuj\u00ed jednotliv\u00e9 kontroly prov\u00e1d\u011bn\u00e9 v k\u00f3du sledov\u00e1n\u00ed d\u011blen\u00ed opr\u00e1vn\u011bn\u00ed. Re\u017eim d\u011blen\u00ed opr\u00e1vn\u011bn\u00ed byl aktivov\u00e1n ve v\u00fdchoz\u00edm nastaven\u00ed v roce 2002, po\u010d\u00ednaje OpenSSH 3.2.2, a je povinn\u00fd od verze OpenSSH 7.5, zve\u0159ejn\u011bn\u00e9 v roce 2017. Krom\u011b toho je ve p\u0159enosn\u00fdch verz\u00edch OpenSSH od verze 6.5 (2014) zranitelnost blokov\u00e1na kompilac\u00ed s aktivovan\u00fdmi ochrann\u00fdmi flagy proti p\u0159ete\u010den\u00ed celo\u010d\u00edseln\u00e9 prom\u011bnn\u00e9. <\/p>\n
Dal\u0161\u00ed zm\u011bny: <\/p>\n
V n\u011bkter\u00e9m z n\u00e1sleduj\u00edc\u00edch vyd\u00e1n\u00ed se pl\u00e1nuje, \u017ee utility scp defaultn\u011b p\u0159ejdou na pou\u017e\u00edv\u00e1n\u00ed SFTP m\u00edsto zastaral\u00e9ho protokolu SCP\/RCP. SFTP pou\u017e\u00edv\u00e1 p\u0159edv\u00eddateln\u011bj\u0161\u00ed metody zpracov\u00e1n\u00ed jmen a nezpracov\u00e1v\u00e1 glob \u0161ablony v n\u00e1zvech soubor\u016f pomoc\u00ed shellu na druh\u00e9m hostiteli, co\u017e zp\u016fsobuje bezpe\u010dnostn\u00ed probl\u00e9my. Konkr\u00e9tn\u011b p\u0159i pou\u017e\u00edv\u00e1n\u00ed SCP a RCP server rozhoduje o tom, kter\u00e9 soubory a slo\u017eky po\u0161le klientovi, zat\u00edmco klient pouze ov\u011b\u0159uje spr\u00e1vnost vr\u00e1cen\u00fdch n\u00e1zv\u016f objekt\u016f, co\u017e v p\u0159\u00edpad\u011b nedostate\u010dn\u00fdch ov\u011b\u0159en\u00ed na stran\u011b klienta umo\u017e\u0148uje serveru<\/a> p\u0159edat jin\u00e1 jm\u00e9na soubor\u016f, kter\u00e1 se li\u0161\u00ed od po\u017eadovan\u00fdch. Protokol SFTP nen\u00ed zat\u00ed\u017een uveden\u00fdmi probl\u00e9my, ale nepodporuje roz\u0161\u00ed\u0159en\u00ed speci\u00e1ln\u00edch cest, jako je '~\/'. Aby se toto rozd\u00edl odstranil, bylo v posledn\u00edm vyd\u00e1n\u00ed OpenSSH navr\u017eeno nov\u00e9 roz\u0161\u00ed\u0159en\u00ed SFTP protokolu pro odkryt\u00ed cest ~\/ a ~user\/. \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 […]<\/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\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Release OpenSSH 8.9 s odstran\u011bn\u00edm zranitelnosti v sshd | ProHoster","description":"Po \u0161esti m\u011bs\u00edc\u00edch v\u00fdvoje byl p\u0159edstaven release OpenSSH 8.9, otev\u0159en\u00e9 implementace klienta a serveru pro pr\u00e1ci s protokoly SSH 2.0 a SFTP.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/reliz-openssh-8-9-s-ustraneniem-uyazvimosti-v-sshd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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 8.9 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 sshd | ProHoster","og:description":"\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 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"