{"id":78381,"date":"2020-04-19T07:42:02","date_gmt":"2020-04-19T05:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-dns-servera-bind-9-11-18-9-16-2-i-9-17-1"},"modified":"2020-04-19T07:42:02","modified_gmt":"2020-04-19T05:42:02","slug":"obnovlenie-dns-servera-bind-9-11-18-9-16-2-i-9-17-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-dns-servera-bind-9-11-18-9-16-2-i-9-17-1","title":{"rendered":"Aktualizace DNS serveru BIND 9.11.18, 9.16.2 a 9.17.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byly zve\u0159ejn\u011bny<\/a><\/noindex> Opravy stabiln\u00edch v\u011btv\u00ed DNS serveru BIND 9.11.18 a 9.16.2 a tak\u00e9 prob\u00edhaj\u00edc\u00ed experiment\u00e1ln\u00ed v\u011btve 9.17.1. V nov\u00fdch vyd\u00e1n\u00edch odstran\u011bna<\/a><\/noindex> bezpe\u010dnostn\u00ed probl\u00e9m spojen\u00fd s neefektivn\u00ed ochranou proti \u00fatok\u016fm \u201eDNS rebinding<\/a><\/noindex>\u201c p\u0159i pr\u00e1ci v re\u017eimu p\u0159esm\u011brov\u00e1vaj\u00edc\u00edho DNS serveru (blok \u201eforwarders\u201c v nastaven\u00ed). D\u00e1le byla provedena opat\u0159en\u00ed ke zkr\u00e1cen\u00ed velikosti pam\u011b\u0165ov\u00e9 statistiky digit\u00e1ln\u00edch podpis\u016f pro DNSSEC \u2014 po\u010det sledovan\u00fdch kl\u00ed\u010d\u016f byl sn\u00ed\u017een na 4 pro ka\u017edou z\u00f3nu, co\u017e sta\u010d\u00ed v 99 % p\u0159\u00edpad\u016f.<\/p>\n

Technika \u201eDNS rebinding\u201c umo\u017e\u0148uje p\u0159i otev\u0159en\u00ed ur\u010dit\u00e9 str\u00e1nky v prohl\u00ed\u017ee\u010di u\u017eivatelem nav\u00e1zat WebSocketov\u00e9 spojen\u00ed se s\u00ed\u0165ovou slu\u017ebou ve vnit\u0159n\u00ed s\u00edti, kter\u00e1 nen\u00ed dostupn\u00e1 pro p\u0159\u00edm\u00fd p\u0159\u00edstup p\u0159es internet. Pro obch\u00e1zen\u00ed ochrany v prohl\u00ed\u017ee\u010d\u00edch proti p\u0159ekro\u010den\u00ed aktu\u00e1ln\u00ed dom\u00e9ny (cross-origin) se pou\u017e\u00edv\u00e1 zm\u011bna n\u00e1zvu hostitele v DNS. Na DNS serveru \u00fato\u010dn\u00edka se nastavuje postupn\u00e9 poskytov\u00e1n\u00ed dvou IP adres: na prvn\u00ed \u017e\u00e1dost je vr\u00e1cena skute\u010dn\u00e1 IP adresa serveru se str\u00e1nkou, a na n\u00e1sledn\u00e9 \u017e\u00e1dosti je vr\u00e1cena intern\u00ed adresa za\u0159\u00edzen\u00ed (nap\u0159\u00edklad 192.168.10.1).<\/p>\n

\u017divotnost (TTL) pro prvn\u00ed odpov\u011b\u010f je nastavena na minim\u00e1ln\u00ed hodnotu, tak\u017ee p\u0159i otev\u0159en\u00ed str\u00e1nky prohl\u00ed\u017ee\u010d ur\u010duje skute\u010dnou IP adresu serveru \u00fato\u010dn\u00edka a na\u010d\u00edt\u00e1 obsah str\u00e1nky. Na str\u00e1nce se spou\u0161t\u00ed JavaScriptov\u00fd k\u00f3d, kter\u00fd \u010dek\u00e1 na vypr\u0161en\u00ed TTL a odes\u00edl\u00e1 druh\u00fd dotaz, kter\u00fd nyn\u00ed ur\u010duje hostitele jako 192.168.10.1. To umo\u017e\u0148uje prost\u0159ednictv\u00edm JavaScriptu p\u0159istupovat k slu\u017eb\u011b uvnit\u0159 lok\u00e1ln\u00ed s\u00edt\u011b, \u010d\u00edm\u017e obch\u00e1z\u00ed omezen\u00ed cross-origin. Ochrana<\/a><\/noindex> ochrana p\u0159ed podobn\u00fdmi \u00fatoky v BIND je zalo\u017eena na blokov\u00e1n\u00ed vracen\u00ed extern\u00edmi servery IP adres aktu\u00e1ln\u00ed vnit\u0159n\u00ed s\u00edt\u011b nebo CNAME alias\u016f pro m\u00edstn\u00ed dom\u00e9ny pomoc\u00ed nastaven\u00ed deny-answer-addresses a deny-answer-aliases.<\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0442\u043e\u043a DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 BIND 9.11.18 \u0438 9.16.2, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0435\u0439\u0441\u044f \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 9.17.1. \u0412 \u043d\u043e\u0432\u044b\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u043d\u0435\u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u044c\u044e \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0430\u0442\u0430\u043a «DNS rebinding» \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u044b DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 (\u0431\u043b\u043e\u043a «forwarders» \u0432 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u0445). \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0430 \u0440\u0430\u0431\u043e\u0442\u0430 \u043f\u043e \u0441\u043e\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u044e \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u0445\u0440\u0430\u043d\u044f\u0449\u0435\u0439\u0441\u044f \u0432 \u043f\u0430\u043c\u044f\u0442\u0438 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 […]<\/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-78381","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\udd47Aktualizace DNS serveru BIND 9.11.18, 9.16.2 a 9.17.1 | ProHoster","description":"Byly vyd\u00e1ny opravn\u00e9 aktualizace stabiln\u00edch v\u011btv\u00ed DNS serveru BIND 9.11.18 a 9.16.2, 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