{"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\/cs\/blog\/news\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","title":{"rendered":"DNSpooq \u2013 sedm nov\u00fdch zranitelnost\u00ed v dnsmasq","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Odborn\u00edci z laborato\u0159\u00ed JSOF research ozn\u00e1mili sedm nov\u00fdch zranitelnost\u00ed na DNS\/DHCP serveru dnsmasq. Server dnsmasq je velmi popul\u00e1rn\u00ed a je ve v\u00fdchoz\u00edm nastaven\u00ed pou\u017e\u00edv\u00e1n v mnoha distribuc\u00edch linuxu, jako\u017e i v s\u00ed\u0165ov\u00e9m vybaven\u00ed od Cisco, Ubiquiti a dal\u0161\u00edch. Zranitelnosti Dnspooq zahrnuj\u00ed otravu DNS cache a tak\u00e9 vzd\u00e1len\u00e9 spou\u0161t\u011bn\u00ed k\u00f3du. Zranitelnosti byly opraveny ve verzi dnsmasq 2.83.<\/p>\n<p>V roce 2008 zn\u00e1m\u00fd bezpe\u010dnostn\u00ed v\u00fdzkumn\u00edk Dan Kaminsky odhalil a zve\u0159ejnil z\u00e1sadn\u00ed nedostatek mechanismu DNS na internetu. Kaminsky dok\u00e1zal, \u017ee \u00fato\u010dn\u00edci mohou podv\u00e1d\u011bt adresy <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/domain\/\"   title=\"dom\u00e9n.\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3158\">dom\u00e9n.<\/a> a kr\u00e1st data. Od t\u00e9 doby je to zn\u00e1m\u00e9 jako \u201eKaminsk\u00e9ho \u00fatok\u201c.<\/p>\n<p>DNS je po desetilet\u00ed pova\u017eov\u00e1n za nezabezpe\u010den\u00fd protokol, a\u010dkoliv se p\u0159edpokl\u00e1d\u00e1, \u017ee garantuje ur\u010ditou \u00farove\u0148 integrity. Z tohoto d\u016fvodu se na n\u011bj st\u00e1le siln\u011b spol\u00e9h\u00e1. Z\u00e1rove\u0148 byly vyvinuty mechanismy pro zv\u00fd\u0161en\u00ed bezpe\u010dnosti origin\u00e1ln\u00edho protokolu DNS. Tyto mechanismy zahrnuj\u00ed HTTPS, HSTS, DNSSEC a dal\u0161\u00ed iniciativy. I p\u0159esto, \u017ee jsou tyto mechanismy k dispozici, je zachycen\u00ed DNS st\u00e1le nebezpe\u010dn\u00fdm \u00fatokem v roce 2021. Velk\u00e1 \u010d\u00e1st internetu se st\u00e1le spol\u00e9h\u00e1 na DNS stejn\u011b jako v roce 2008 a je vystavena \u00fatok\u016fm stejn\u00e9ho typu.<\/p>\n<p>Zranitelnosti DNSpooq k otr\u00e1v\u011bn\u00ed cache:<br \/>\nCVE-2020-25686, CVE-2020-25684, CVE-2020-25685. Tyto zranitelnosti jsou podobn\u00e9 \u00fatok\u016fm SAD DNS, o kter\u00fdch ned\u00e1vno informovali v\u00fdzkumn\u00edci z Kalifornsk\u00e9 univerzity a \u010c\u00ednsk\u00e9 univerzity Tsinghua. Zranitelnosti SAD DNS a DNSpooq lze tak\u00e9 kombinovat pro zv\u00fd\u0161en\u00ed \u00fa\u010dinnosti \u00fatok\u016f. O dal\u0161\u00edch \u00fatoc\u00edch s nejasn\u00fdmi d\u016fsledky bylo rovn\u011b\u017e informov\u00e1no d\u00edky spolupr\u00e1ci univerzit (Poison Over Troubled Forwarders a dal\u0161\u00ed).<br \/>\nZranitelnosti funguj\u00ed na z\u00e1klad\u011b sn\u00ed\u017een\u00ed entropie. V d\u016fsledku pou\u017eit\u00ed slab\u00e9ho hash pro identifikaci DNS dotaz\u016f a nep\u0159esn\u00e9ho p\u00e1rov\u00e1n\u00ed dotazu a odpov\u011bdi m\u016f\u017ee b\u00fdt entropie v\u00fdrazn\u011b sn\u00ed\u017eena a je nutn\u00e9 uhodnout pouze ~19 bit\u016f, co\u017e umo\u017e\u0148uje otravu cache. Zp\u016fsob, jak\u00fdm dnsmasq zpracov\u00e1v\u00e1 CNAME z\u00e1znamy, umo\u017e\u0148uje podvrhnout \u0159et\u011bzec CNAME z\u00e1znam\u016f a efektivn\u011b otr\u00e1vit a\u017e 9 DNS z\u00e1znam\u016f sou\u010dasn\u011b.<\/p>\n<p>Zranitelnosti p\u0159ete\u010den\u00ed vyrovn\u00e1vac\u00ed pam\u011bti: CVE-2020-25687, CVE-2020-25683, CVE-2020-25682, CVE-2020-25681. V\u0161echny \u010dty\u0159i uveden\u00e9 zranitelnosti se nach\u00e1zej\u00ed v k\u00f3du implementace DNSSEC a projevuj\u00ed se pouze p\u0159i aktivaci kontroly p\u0159es DNSSEC v nastaven\u00edch.<\/p>\n<p>Zdroj: <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-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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.\" \/>\n\t<meta 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