{"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\/pl\/blog\/news\/obnovlenie-dns-servera-bind-9-11-18-9-16-2-i-9-17-1","title":{"rendered":"Aktualizacja serwera DNS BIND 9.11.18, 9.16.2 i 9.17.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Opublikowano<\/a><\/noindex> Poprawki dla stabilnych ga\u0142\u0119zi serwera DNS BIND 9.11.18 i 9.16.2, a tak\u017ce dla eksperymentalnej ga\u0142\u0119zi 9.17.1 w trakcie rozwoju. W nowym wydaniu naprawiono<\/a><\/noindex> problem bezpiecze\u0144stwa zwi\u0105zany z nieefektywno\u015bci\u0105 ochrony przed atakami «DNS rebinding<\/a><\/noindex>» podczas pracy w trybie serwera DNS przekierowuj\u0105cego zapytania (blok «forwarders» w ustawieniach). Ponadto podj\u0119to dzia\u0142ania w celu zmniejszenia rozmiaru statystyk podpis\u00f3w cyfrowych przechowywanych w pami\u0119ci dla DNSSEC \u2014 liczba \u015bledzonych kluczy zosta\u0142a ograniczona do 4 dla ka\u017cdej strefy, co wystarcza w 99% przypadk\u00f3w.<\/p>\n

Technika «DNS rebinding» pozwala po otwarciu przez u\u017cytkownika okre\u015blonej strony w przegl\u0105darce na ustanowienie po\u0142\u0105czenia WebSocket z us\u0142ug\u0105 sieciow\u0105 w wewn\u0119trznej sieci, kt\u00f3ra nie jest dost\u0119pna dla bezpo\u015bredniego dost\u0119pu przez internet. Aby obej\u015b\u0107 stosowan\u0105 w przegl\u0105darkach ochron\u0119 przed wyj\u015bciem poza obszar bie\u017c\u0105cej domeny (cross-origin), wykorzystuje si\u0119 zmian\u0119 nazwy hosta w DNS. Na serwerze DNS atakuj\u0105cego konfiguruje si\u0119 cykliczne wydawanie dw\u00f3ch adres\u00f3w IP: na pierwsze zapytanie wydawany jest rzeczywisty adres IP serwera z stron\u0105, a na kolejne zapytania zwracany jest wewn\u0119trzny adres urz\u0105dzenia (np. 192.168.10.1).<\/p>\n

Czas \u017cycia (TTL) dla pierwszej odpowiedzi ustawiany jest na minimaln\u0105 warto\u015b\u0107, wi\u0119c przy otwieraniu strony przegl\u0105darka okre\u015bla rzeczywisty adres IP serwera atakuj\u0105cego i \u0142aduje tre\u015b\u0107 strony. Na stronie uruchamiany jest kod JavaScript, kt\u00f3ry czeka na wyga\u015bni\u0119cie TTL i wysy\u0142a drugie zapytanie, kt\u00f3re teraz okre\u015bla host jako 192.168.10.1. To pozwala na dost\u0119p do us\u0142ugi w lokalnej sieci z poziomu JavaScript, omijaj\u0105c ograniczenie cross-origin. Ochrona<\/a><\/noindex> ochrona przed podobnymi atakami w BIND opiera si\u0119 na blokowaniu zwrotu zewn\u0119trznymi serwerami adres\u00f3w IP bie\u017c\u0105cej sieci wewn\u0119trznej lub alias\u00f3w CNAME dla lokalnych domen za pomoc\u0105 ustawie\u0144 deny-answer-addresses i deny-answer-aliases.<\/p>\n

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

\u0179r\u00f3d\u0142o: 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\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\udd47Aktualizacja serwera DNS BIND 9.11.18, 9.16.2 i 9.17.1 | ProHoster","description":"Opublikowane zosta\u0142y poprawki dla stabilnych ga\u0142\u0119zi serwera DNS BIND 9.11.18 i 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