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

Publiceret<\/a><\/noindex> Korrigerende opdateringer til de stabile versioner af DNS-serveren BIND 9.11.18 og 9.16.2 samt den eksperimentelle version 9.17.1, der er under udvikling. I de nye udgivelser er blevet l\u00f8st<\/a><\/noindex> et sikkerhedsproblem relateret til ineffektiv beskyttelse mod angreb \u00abDNS rebinding<\/a><\/noindex>\u00bb n\u00e5r man arbejder i tilstand som en DNS-server, der videresender foresp\u00f8rgsler (afsnittet \u00abforwarders\u00bb i indstillingerne). Derudover er der ogs\u00e5 blevet arbejdet p\u00e5 at reducere st\u00f8rrelsen af de gemte digital signatur-statistikker til DNSSEC \u2014 antallet af overv\u00e5gede n\u00f8gler er reduceret til 4 for hver zone, hvilket er tilstr\u00e6kkeligt i 99% af tilf\u00e6ldene.<\/p>\n

Teknikken \u00abDNS rebinding\u00bb g\u00f8r det muligt for brugeren at \u00e5bne en bestemt side i browseren og etablere en WebSocket-forbindelse til en netv\u00e6rkstjeneste i det interne netv\u00e6rk, som ikke er tilg\u00e6ngelig direkte over internettet. For at omg\u00e5 den beskyttelse, som browsere anvender mod at g\u00e5 uden for det nuv\u00e6rende dom\u00e6nes omr\u00e5de (cross-origin), anvendes \u00e6ndring af v\u00e6rtens navn i DNS. P\u00e5 angriberens DNS-server konfigureres det til at returnere to IP-adresser skiftevis: ved den f\u00f8rste anmodning returneres serverens rigtige IP med siden, og ved efterf\u00f8lgende anmodninger returneres den interne adresse p\u00e5 enheden (f.eks. 192.168.10.1).<\/p>\n

Livstiden (TTL) for det f\u00f8rste svar s\u00e6ttes til et minimum, s\u00e5 n\u00e5r siden \u00e5bnes, identificerer browseren den reelle IP-adresse til angriberen og indl\u00e6ser indholdet af siden. P\u00e5 siden k\u00f8rer JavaScript-kode, som venter p\u00e5, at TTL udl\u00f8ber, og sender en anden foresp\u00f8rgsel, som nu identificerer v\u00e6rten som 192.168.10.1. Dette giver mulighed for, at JavaScript kan f\u00e5 adgang til tjenesten inden for det lokale netv\u00e6rk og omg\u00e5 cross-origin begr\u00e6nsningen. Lag<\/a><\/noindex> beskyttelse mod s\u00e5danne angreb i BIND er baseret p\u00e5 at blokere eksterne servere fra at returnere IP-adresser fra det aktuelle interne netv\u00e6rk eller CNAME-aliaser for lokale dom\u00e6ner ved hj\u00e6lp af indstillingerne deny-answer-addresses og deny-answer-aliases.<\/p>\n

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

Kilde: 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, 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\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\udd47Opdatering af DNS-serveren BIND 9.11.18, 9.16.2 og 9.17.1 | ProHoster","description":"Korrigerende opdateringer til de stabile versioner af DNS-serveren BIND 9.11.18 og 9.16.2 er blevet 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