{"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\/pt\/blog\/news\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","title":{"rendered":"DNSpooq - sete novas vulnerabilidades no dnsmasq","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Especialistas dos laborat\u00f3rios de pesquisa JSOF relataram sete novas vulnerabilidades no servidor DNS\/DHCP dnsmasq. O servidor dnsmasq \u00e9 bastante popular e utilizado por padr\u00e3o em muitas distribui\u00e7\u00f5es Linux, bem como em equipamentos de rede da Cisco, Ubiquiti e outros. As vulnerabilidades Dnspooq incluem envenenamento de cache DNS e execu\u00e7\u00e3o remota de c\u00f3digo. As vulnerabilidades foram corrigidas no dnsmasq 2.83.<\/p>\n<p>Em 2008, o famoso pesquisador de seguran\u00e7a Dan Kaminsky descobriu e divulgou uma falha fundamental no mecanismo DNS da Internet. Kaminsky provou que invasores podem falsificar endere\u00e7os <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/domain\/\"   title=\"dom\u00ednios\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3158\">dom\u00ednios<\/a> e roubar dados. Desde ent\u00e3o, isso ficou conhecido como &laquo;Ataque de Kaminski&raquo;.<\/p>\n<p>O DNS \u00e9 considerado um protocolo inseguro h\u00e1 d\u00e9cadas, embora se suponha que ele garanta um certo n\u00edvel de integridade. \u00c9 por essa raz\u00e3o que ainda \u00e9 amplamente utilizado. Ao mesmo tempo, foram desenvolvidos mecanismos para aumentar a seguran\u00e7a do protocolo original DNS. Esses mecanismos incluem HTTPS, HSTS, DNSSEC e outras iniciativas. No entanto, mesmo com todos esses mecanismos, o sequestro de DNS ainda \u00e9 um ataque perigoso em 2021. Grande parte da internet ainda confia no DNS da mesma forma que em 2008, e est\u00e1 sujeita a ataques do mesmo tipo.<\/p>\n<p>Vulnerabilidades de envenenamento de cache DNSpooq:<br \/>\nCVE-2020-25686, CVE-2020-25684, CVE-2020-25685. Essas vulnerabilidades s\u00e3o semelhantes aos ataques SAD DNS, recentemente relatados por pesquisadores da Universidade da Calif\u00f3rnia e da Universidade Tsinghua. As vulnerabilidades SAD DNS e DNSpooq tamb\u00e9m podem ser combinadas para facilitar ainda mais os ataques. Relat\u00f3rios sobre outros ataques com consequ\u00eancias incertas tamb\u00e9m foram feitos em esfor\u00e7os conjuntos de universidades (Poison Over Troubled Forwarders e outros).<br \/>\nAs vulnerabilidades operam atrav\u00e9s da redu\u00e7\u00e3o da entropia. Devido ao uso de um hash fraco para identificar consultas DNS e \u00e0 correspond\u00eancia imprecisa de consultas \u00e0s respostas, a entropia pode ser significativamente reduzida, sendo necess\u00e1rio adivinhar apenas ~19 bits, o que torna poss\u00edvel o envenenamento de cache. A forma como o dnsmasq processa os registros CNAME permite falsificar a cadeia de registros CNAME e efetivamente envenenar at\u00e9 9 registros DNS ao mesmo tempo.<\/p>\n<p>Vulnerabilidades de buffer overflow: CVE-2020-25687, CVE-2020-25683, CVE-2020-25682, CVE-2020-25681. Todas as 4 vulnerabilidades listadas est\u00e3o presentes no c\u00f3digo com a implementa\u00e7\u00e3o do DNSSEC e se manifestam apenas quando a verifica\u00e7\u00e3o atrav\u00e9s do DNSSEC est\u00e1 ativada nas configura\u00e7\u00f5es.<\/p>\n<p>Fonte: <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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