{"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\/it\/blog\/news\/obnovlenie-dns-servera-bind-9-11-18-9-16-2-i-9-17-1","title":{"rendered":"Aggiornamento del server DNS BIND 9.11.18, 9.16.2 e 9.17.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/bind-announce@lists.isc.org\/msg00569.html\">Pubblicati<\/a><\/noindex> correttivi per le versioni stabili del server DNS BIND 9.11.18 e 9.16.2, oltre che per la versione sperimentale in sviluppo 9.17.1. Nei nuovi rilasci <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/isc-projects\/bind9\/commit\/20f70f24ee6720e1de80a6f10d9a33fc290ed3ed\">\u00e8 stato risolto<\/a><\/noindex> problema di sicurezza legata all'inefficienza della protezione contro gli attacchi \u00ab<noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=27533\">DNS rebinding<\/a><\/noindex>\u00bb quando si lavora in modalit\u00e0 server DNS per il forwarding delle richieste (sezione \u00abforwarders\u00bb nelle impostazioni). Inoltre, sono stati eseguiti lavori di riduzione della dimensione della memoria per le statistiche delle firme digitali per DNSSEC: il numero di chiavi monitorate \u00e8 stato ridotto a 4 per ogni zona, sufficiente nel 99% dei casi.<\/p>\n<p>La tecnica \u00abDNS rebinding\u00bb consente, aprendo un determinato pagina nel browser, di stabilire una connessione WebSocket a un servizio di rete in una rete interna, non accessibile direttamente tramite internet. Per eludere la protezione contro l'uscita dal dominio attuale (cross-origin) implementata nei browser, si utilizza un cambio del nome host nel DNS. Sul server DNS dell'attaccante si configura l'invio alternato di due indirizzi IP: alla prima richiesta viene restituito l'indirizzo IP reale del server con la pagina, mentre nelle richieste successive viene restituito l'indirizzo interno del dispositivo (ad esempio, 192.168.10.1).<\/p>\n<p>Il tempo di vita (TTL) per la prima risposta \u00e8 impostato al valore minimo, quindi quando si apre la pagina, il browser determina l'indirizzo IP reale del server attaccante e carica il contenuto della pagina. Nella pagina viene eseguito il codice JavaScript, che attende la scadenza del TTL e invia una seconda richiesta, che ora identifica l'host come 192.168.10.1. Questo consente al JavaScript di accedere al servizio all'interno della rete locale, eludendo la restrizione cross-origin. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/isc-projects\/bind9\/commit\/40d0f115a64595aa83cfe0b760587d3d1efa0385\">Protezione<\/a><\/noindex> la protezione contro tali attacchi in BIND \u00e8 basata sul blocco del ritorno di indirizzi IP della rete interna attuale o alias CNAME per domini locali da parte di server esterni tramite le impostazioni deny-answer-addresses e deny-answer-aliases.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52760\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 &#171;DNS rebinding&#187; \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 &#171;forwarders&#187; \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 [&hellip;]<\/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<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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, 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