{"id":98911,"date":"2021-01-21T14:42:14","date_gmt":"2021-01-21T12:42:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq"},"modified":"2021-01-21T14:42:14","modified_gmt":"2021-01-21T12:42:14","slug":"dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","title":{"rendered":"DNSpooq \u2013 sieben neue Schwachstellen in dnsmasq","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Experten der JSOF-Forschungslabore berichteten von sieben neuen Schwachstellen im DNS\/DHCP-Server dnsmasq. Der dnsmasq-Server ist sehr beliebt und wird standardm\u00e4\u00dfig in vielen Linux-Distributionen sowie in Netzwerkger\u00e4ten von Cisco, Ubiquiti und anderen verwendet. Die Schwachstellen von Dnspooq umfassen DNS-Cache-Vergiftung sowie die Remote-Codeausf\u00fchrung. Die Schwachstellen wurden in dnsmasq 2.83 behoben.<\/p>\n<p>Im Jahr 2008 entdeckte und enth\u00fcllte der bekannte Sicherheitsexperte Dan Kaminsky einen grundlegenden Mangel im DNS-Mechanismus des Internets. Kaminsky bewies, dass Angreifer Adressen manipulieren <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/de\/domain\/\"   title=\"Dom\u00e4nen\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3158\">Dom\u00e4nen<\/a> und Daten zu stehlen. Seitdem ist dies als &laquo;Kaminsky-Angriff&raquo; bekannt geworden.<\/p>\n<p>DNS gilt seit Jahrzehnten als unsicheres Protokoll, obwohl angenommen wird, dass es ein gewisses Ma\u00df an Integrit\u00e4t gew\u00e4hrleistet. Aus diesem Grund wird es nach wie vor stark genutzt. Gleichzeitig wurden Mechanismen zur Verbesserung der Sicherheit des urspr\u00fcnglichen DNS-Protokolls entwickelt. Diese Mechanismen umfassen HTTPS, HSTS, DNSSEC und andere Initiativen. Dennoch bleibt der DNS-\u00dcbergriff auch im Jahr 2021 eine gef\u00e4hrliche Attacke. Ein Gro\u00dfteil des Internets verl\u00e4sst sich noch immer auf DNS, wie schon 2008, und ist denselben Angriffen ausgesetzt.<\/p>\n<p>Schwachstellen bei DNSpooq Cache Poisoning:<br \/>\nCVE-2020-25686, CVE-2020-25684, CVE-2020-25685. Diese Schwachstellen sind \u00e4hnlich wie die SAD DNS-Angriffe, \u00fcber die k\u00fcrzlich Forscher der University of California und der Tsinghua University berichteten. Die Schwachstellen von SAD DNS und DNSpooq k\u00f6nnen auch kombiniert werden, um Angriffe weiter zu erleichtern. \u00dcber zus\u00e4tzliche Angriffe mit unklaren Konsequenzen wurde ebenfalls in Kooperation zwischen den Universit\u00e4ten berichtet (Poison Over Troubled Forwarders usw.).<br \/>\nSchwachstellen nutzen die verringerte Entropie aus. Aufgrund der Verwendung eines schwachen Hashes zur Identifizierung von DNS-Anfragen und einer ungenauen Zuordnung von Anfrage zu Antwort kann die Entropie erheblich verringert werden, sodass man nur ~19 Bit erraten muss, was eine Cache-Vergiftungsattacke m\u00f6glich macht. Die Art und Weise, wie dnsmasq CNAME-Eintr\u00e4ge verarbeitet, erm\u00f6glicht es, Ketten von CNAME-Eintr\u00e4gen zu f\u00e4lschen und effektiv bis zu 9 DNS-Eintr\u00e4ge gleichzeitig zu vergiften.<\/p>\n<p>Buffer Overflow Schwachstellen: CVE-2020-25687, CVE-2020-25683, CVE-2020-25682, CVE-2020-25681. Alle vier genannten Schwachstellen sind im Code mit DNSSEC-Implementierung zu finden und treten nur auf, wenn die \u00dcberpr\u00fcfung \u00fcber DNSSEC in den Einstellungen aktiviert ist.<\/p>\n<p>Quelle: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/security\/16121275\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0441\u0442\u044b \u0438\u0437 JSOF research labs \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u0438 \u043e \u0441\u0435\u043c\u0438 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 DNS\/DHCP \u0441\u0435\u0440\u0432\u0435\u0440\u0435 dnsmasq. \u0421\u0435\u0440\u0432\u0435\u0440 dnsmasq \u0432\u0435\u0441\u044c\u043c\u0430 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u0435\u043d \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 linux, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0438 Cisco, Ubiquiti \u0438 \u043f\u0440\u043e\u0447\u0438\u0445. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 Dnspooq \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0442 \u0432 \u0441\u0435\u0431\u044f \u043e\u0442\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 DNS-\u043a\u044d\u0448\u0430, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u044b \u0432 dnsmasq 2.83. \u0412 2008 \u0433\u043e\u0434\u0443 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-98911","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0441\u0442\u044b \u0438\u0437 JSOF research labs \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u0438 \u043e \u0441\u0435\u043c\u0438 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 DNS\/DHCP \u0441\u0435\u0440\u0432\u0435\u0440\u0435 dnsmasq. \u0421\u0435\u0440\u0432\u0435\u0440 dnsmasq \u0432\u0435\u0441\u044c\u043c\u0430 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ProHoster","description":"Fachleute von den JSOF Research Labs berichteten \u00fcber sieben neue Schwachstellen im DNS\/DHCP-Server dnsmasq. Der Server dnsmasq ist sehr beliebt und wird standardm\u00e4\u00dfig in vielen Linux-Distributionen sowie in Netzwerkger\u00e4ten von Cisco, Ubiquiti und anderen verwendet. Die Dnspooq-Schwachstellen umfassen DNS-Cache-Vergiftung und die Remote-Ausf\u00fchrung von Code. Die Schwachstellen wurden in dnsmasq 2.83 behoben. Im Jahr 2008","canonical_url":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"de_DE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47DNSpooq \u2014 \u0441\u0435\u043c\u044c \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 dnsmasq | ProHoster","og:description":"\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0441\u0442\u044b \u0438\u0437 JSOF research labs \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u0438 \u043e \u0441\u0435\u043c\u0438 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