{"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\/es\/blog\/news\/dnspooq-sem-novyh-uyazvimostej-v-dnsmasq","title":{"rendered":"DNSpooq \u2014 siete nuevas vulnerabilidades en dnsmasq","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Los especialistas de los laboratorios de investigaci\u00f3n JSOF han informado sobre siete nuevas vulnerabilidades en el servidor DNS\/DHCP dnsmasq. Este servidor es muy popular y se utiliza por defecto en muchas distribuciones de Linux, as\u00ed como en equipos de red de Cisco, Ubiquiti y otros. Las vulnerabilidades de Dnspooq incluyen envenenamiento de cach\u00e9 DNS, as\u00ed como ejecuci\u00f3n remota de c\u00f3digo. Las vulnerabilidades han sido corregidas en dnsmasq 2.83.<\/p>\n<p>En 2008, el reconocido investigador de seguridad Dan Kaminsky descubri\u00f3 y revel\u00f3 una falla fundamental en el mecanismo DNS de Internet. Kaminsky demostr\u00f3 que los atacantes pod\u00edan suplantar direcciones <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/domain\/\"   title=\"dominios\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3158\">dominios<\/a> y robar datos. Desde entonces, se ha conocido como &laquo;Ataque Kaminski&raquo;.<\/p>\n<p>El DNS se ha considerado un protocolo inseguro durante d\u00e9cadas, aunque se supone que garantiza un cierto nivel de integridad. Por esta raz\u00f3n, todav\u00eda se conf\u00eda mucho en \u00e9l. Al mismo tiempo, se han desarrollado mecanismos para aumentar la seguridad del protocolo DNS original. Estos mecanismos incluyen HTTPS, HSTS, DNSSEC y otras iniciativas. Sin embargo, incluso con todos estos mecanismos, el secuestro de DNS sigue siendo un ataque peligroso en 2021. La mayor parte de Internet a\u00fan depende del DNS de la misma manera que en 2008 y es susceptible a ataques del mismo tipo.<\/p>\n<p>Vulnerabilidades de envenenamiento de cach\u00e9 DNSpooq:<br \/>\nCVE-2020-25686, CVE-2020-25684, CVE-2020-25685. Estas vulnerabilidades son similares a los ataques SAD DNS, de los cuales se inform\u00f3 recientemente por investigadores de la Universidad de California y la Universidad de Tsinghua. Las vulnerabilidades SAD DNS y DNSpooq tambi\u00e9n pueden combinarse para facilitar a\u00fan m\u00e1s los ataques. Tambi\u00e9n se han informado sobre ataques adicionales con consecuencias inciertas gracias a esfuerzos conjuntos de universidades (Poison Over Troubled Forwarders, entre otros).<br \/>\nLas vulnerabilidades funcionan reduciendo la entrop\u00eda. Debido al uso de un hash d\u00e9bil para identificar solicitudes DNS y la coincidencia inexacta de solicitudes con respuestas, la entrop\u00eda puede reducirse significativamente y solo se necesita adivinar aproximadamente 19 bits, lo que hace posible el envenenamiento de la cach\u00e9. La forma en que dnsmasq maneja los registros CNAME permite falsificar la cadena de registros CNAME y efectivamente envenenar hasta 9 registros DNS de manera simult\u00e1nea.<\/p>\n<p>Vulnerabilidades de desbordamiento de b\u00fafer: CVE-2020-25687, CVE-2020-25683, CVE-2020-25682, CVE-2020-25681. Las 4 vulnerabilidades mencionadas est\u00e1n presentes en el c\u00f3digo de implementaci\u00f3n de DNSSEC y se manifiestan solo cuando se habilita la verificaci\u00f3n a trav\u00e9s de DNSSEC en la configuraci\u00f3n.<\/p>\n<p>Fuente: <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 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