{"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\/pl\/blog\/news\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","title":{"rendered":"DNSpooq \u2013 siedem nowych podatno\u015bci w dnsmasq","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Specjali\u015bci z laboratori\u00f3w badawczych JSOF poinformowali o siedmiu nowych podatno\u015bciach w serwerach DNS\/DHCP dnsmasq. Serwer dnsmasq jest do\u015b\u0107 popularny i jest domy\u015blnie u\u017cywany w wielu dystrybucjach Linux, a tak\u017ce w sprz\u0119cie sieciowym Cisco, Ubiquiti i innych. Podatno\u015bci Dnspooq obejmuj\u0105 przepe\u0142nienie pami\u0119ci podr\u0119cznej DNS oraz zdalne wykonywanie kodu. Podatno\u015bci zosta\u0142y naprawione w dnsmasq 2.83.<\/p>\n<p>W 2008 roku znany badacz w dziedzinie bezpiecze\u0144stwa Dan Kaminsky odkry\u0142 i ujawni\u0142 fundamentaln\u0105 wad\u0119 mechanizmu DNS w Internecie. Kaminsky udowodni\u0142, \u017ce przest\u0119pcy mog\u0105 podmienia\u0107 adresy <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/domain\/\"   title=\"domen\u00f3w\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3158\">domen\u00f3w<\/a> i kradzie\u017c danych. Od tego czasu sta\u0142o si\u0119 to znane jako \u201eAtak Kami\u0144skiego\u201d.<\/p>\n<p>DNS uwa\u017cany jest za niebezpieczny protok\u00f3\u0142 od dziesi\u0119cioleci, cho\u0107 zak\u0142ada si\u0119, \u017ce zapewnia pewien poziom integralno\u015bci. Dlatego wci\u0105\u017c jest w du\u017cym stopniu wykorzystywany. Jednocze\u015bnie opracowano mechanizmy zwi\u0119kszaj\u0105ce bezpiecze\u0144stwo podstawowego protoko\u0142u DNS. Mechanizmy te obejmuj\u0105 HTTPS, HSTS, DNSSEC i inne inicjatywy. Niemniej jednak, nawet w obliczu wszystkich tych mechanizm\u00f3w, przechwytywanie DNS wci\u0105\u017c jest niebezpiecznym atakiem w 2021 roku. Wi\u0119kszo\u015b\u0107 Internetu wci\u0105\u017c polega na DNS tak samo, jak w 2008 roku, i jest nara\u017cona na ataki tego typu.<\/p>\n<p>Podatno\u015bci na przepe\u0142nienie pami\u0119ci podr\u0119cznej DNSpooq:<br \/>\nCVE-2020-25686, CVE-2020-25684, CVE-2020-25685. Te podatno\u015bci s\u0105 podobne do atak\u00f3w SAD DNS, o kt\u00f3rych niedawno informowali badacze z Uniwersytetu Kalifornijskiego i Uniwersytetu Tsinghua. Podatno\u015bci SAD DNS i DNSpooq mog\u0105 by\u0107 r\u00f3wnie\u017c \u0142\u0105czone w celu u\u0142atwienia atak\u00f3w. O dodatkowych atakach o niejasnych skutkach informowano wsp\u00f3lnym wysi\u0142kiem uniwersytet\u00f3w (Poison Over Troubled Forwarders itp.).<br \/>\nPodatno\u015bci dzia\u0142aj\u0105 poprzez zmniejszenie entropii. Z powodu u\u017cycia s\u0142abego hasha do identyfikacji zapyta\u0144 DNS oraz niedok\u0142adnego dopasowania zapytania do odpowiedzi, entropia mo\u017ce by\u0107 znacznie zredukowana, a do odgadni\u0119cia potrzeba tylko ~19 bit\u00f3w, co umo\u017cliwia przepe\u0142nienie pami\u0119ci podr\u0119cznej. Spos\u00f3b, w jaki dnsmasq obs\u0142uguje rekordy CNAME, pozwala na fa\u0142szowanie \u0142a\u0144cucha rekord\u00f3w CNAME i efektywne przepe\u0142nienie do 9 rekord\u00f3w DNS jednocze\u015bnie.<\/p>\n<p>Vulnerabilities of buffer overflow: CVE-2020-25687, CVE-2020-25683, CVE-2020-25682, CVE-2020-25681. All four vulnerabilities are present in the code implementing DNSSEC and appear only when DNSSEC verification is enabled in the settings.<\/p>\n<p>\u0179r\u00f3d\u0142o: <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 5.0.2 - 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 name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri 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