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

Gepubliceerd<\/a><\/noindex> Correctieve updates voor de stabiele versies van de DNS-server BIND 9.11.18 en 9.16.2, evenals de experimentele versie 9.17.1 die in ontwikkeling is. In de nieuwe releases opgelost<\/a><\/noindex> een beveiligingsprobleem dat samenhangt met de ineffectiviteit van de bescherming tegen aanvallen «DNS rebinding<\/a><\/noindex>» tijdens het werken in de modus van een DNS-server die verzoeken doorverwijst (het blok «forwarders» in de instellingen). Daarnaast is er gewerkt aan het verkleinen van de in geheugen opgeslagen statistieken van digitale handtekeningen voor DNSSEC \u2014 het aantal bij te houden sleutels is teruggebracht tot 4 voor elke zone, wat in 99% van de gevallen voldoende is.<\/p>\n

De techniek «DNS rebinding» maakt het mogelijk om bij het openen door de gebruiker van een bepaalde pagina in de browser een WebSocket-verbinding tot stand te brengen met een netwerkservice in een intern netwerk, die niet rechtstreeks toegankelijk is via het internet. Om de in browsers toegepaste bescherming tegen kruisbestanden (cross-origin) te omzeilen, wordt de hostnaam in de DNS veranderd. Op de DNS-server van de aanvaller wordt afwisselend twee IP-adressen verstrekt: bij de eerste aanvraag wordt het echte IP van de server met de pagina gegeven, en bij de volgende aanvragen wordt het interne adres van het apparaat geretourneerd (bijvoorbeeld 192.168.10.1).<\/p>\n

De tijdsduur (TTL) voor het eerste antwoord wordt op de minimale waarde ingesteld, zodat de browser bij het openen van de pagina het echte IP-adres van de aanvaller bepaalt en de inhoud van de pagina laadt. Op de pagina wordt een JavaScript-code uitgevoerd die wacht op het verstrijken van de TTL en een tweede verzoek verstuurt, dat nu de host als 192.168.10.1 definieert. Dit stelt JavaScript in staat om toegang te krijgen tot de dienst binnen het lokale netwerk, waarmee de cross-origin beperking wordt omzeild. Beveiliging<\/a><\/noindex> De bescherming tegen dergelijke aanvallen in BIND is gebaseerd op het blokkeren van externe servers die IP-adressen van het huidige interne netwerk of CNAME-aliasen voor lokale domeinen teruggeven via de instellingen deny-answer-addresses en deny-answer-aliases.<\/p>\n

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

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

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