{"id":103950,"date":"2022-05-04T15:37:02","date_gmt":"2022-05-04T13:37:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns"},"modified":"2022-05-04T15:37:02","modified_gmt":"2022-05-04T13:37:03","slug":"uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","title":{"rendered":"Vulnerabilidad en uClibc y uClibc-ng que permite modificar datos en la cach\u00e9 DNS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>En las bibliotecas est\u00e1ndar de C uClibc y uClibc-ng, utilizadas en muchos dispositivos integrados y port\u00e1tiles, se ha detectado una vulnerabilidad (CVE no asignado) que permite insertar datos falsos en la cach\u00e9 DNS, lo que puede utilizarse para reemplazar en la cach\u00e9 la direcci\u00f3n IP de un dominio arbitrario y redirigir las solicitudes al dominio a un servidor controlado por un atacante.     <\/p>\n<p>El problema afecta a varios firmware de Linux para enrutadores, puntos de acceso y dispositivos de Internet de las cosas, as\u00ed como a distribuciones de Linux para sistemas integrados, como OpenWRT y Embedded Gentoo. Se ha observado que la vulnerabilidad se manifiesta en dispositivos de muchos fabricantes (por ejemplo, uClibc se utiliza en los firmware de Linksys, Netgear y Axis), pero dado que la vulnerabilidad en uClibc y uClibc-ng permanece sin solucionar, no se divulgan detalles sobre dispositivos y fabricantes espec\u00edficos que tienen el problema en sus productos por el momento.    <\/p>\n<p>La vulnerabilidad se debe al uso en el c\u00f3digo de env\u00edo de solicitudes DNS de identificadores de transacci\u00f3n predecibles. El n\u00famero de identificaci\u00f3n de la solicitud DNS se seleccionaba mediante un simple incremento de un contador sin aplicar una aleatorizaci\u00f3n adicional de los n\u00fameros de puerto, lo que permit\u00eda lograr el envenenamiento de la cach\u00e9 DNS a trav\u00e9s del env\u00edo anticipado de paquetes UDP con respuestas falsas (la respuesta ser\u00e1 aceptada si llega antes que la respuesta real y contiene un ID v\u00e1lido). <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-los-angeles\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3809\">servidores<\/a> A diferencia del m\u00e9todo de Kaminsky propuesto en 2008, el identificador de transacci\u00f3n ni siquiera necesita ser adivinado, ya que es originalmente predecible (se establece inicialmente en 1, el cual se incrementa con cada solicitud, en lugar de ser seleccionado aleatoriamente).     <center><img decoding=\"async\" alt=\"Vulnerabilidad en uClibc y uClibc-ng que permite modificar datos en la cach\u00e9 DNS\" src=\"\/wp-content\/uploads\/2022\/05\/29cd1ae29db2776f3121eda961bd8c4d.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>En la especificaci\u00f3n para proteger contra la adivinanza del identificador, se recomienda aplicar una distribuci\u00f3n aleatoria de los n\u00fameros de puertos de red de origen desde los cuales se env\u00edan las solicitudes DNS, lo que compensa el tama\u00f1o insuficientemente grande del identificador. Al habilitar la aleatorizaci\u00f3n de puertos para generar respuestas falsas, adem\u00e1s de adivinar un identificador de 16 bits, tambi\u00e9n es necesario adivinar el n\u00famero del puerto de red. En uClibc y uClibc-ng, tal aleatorizaci\u00f3n no se habilit\u00f3 expl\u00edcitamente (al llamar a bind no se especificaba un puerto UDP de origen aleatorio) y su aplicaci\u00f3n depend\u00eda de la configuraci\u00f3n del sistema operativo.     <\/p>\n<p>Al desactivar la aleatorizaci\u00f3n de las almohadillas, la identificaci\u00f3n del identificador de solicitud incremental se considera una tarea trivial. Pero incluso en el caso de que se aplique la aleatorizaci\u00f3n, el atacante solo necesita adivinar el puerto de red de un rango de 32768\u201360999, para lo cual puede utilizar un env\u00edo masivo simult\u00e1neo de respuestas ficticias a trav\u00e9s de diferentes puertos de red.    <center><img decoding=\"async\" alt=\"Vulnerabilidad en uClibc y uClibc-ng que permite modificar datos en la cach\u00e9 DNS\" src=\"\/wp-content\/uploads\/2022\/05\/ba16f63c3eab657ee687a893744ae972.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>El problema ha sido confirmado en todas las versiones recientes de uClibc y uClibc-ng, incluidas las versiones m\u00e1s recientes uClibc 0.9.33.2 y uClibc-ng 1.0.40. En septiembre de 2021, la informaci\u00f3n sobre la vulnerabilidad fue enviada a CERT\/CC para la preparaci\u00f3n coordinada de correcciones. En enero de 2022, los datos sobre el problema fueron transmitidos a m\u00e1s de 200 fabricantes que colaboran con CERT\/CC. En marzo, se intent\u00f3 contactar por separado al mantenedor del proyecto uClibc-ng, pero respondi\u00f3 que no pod\u00eda solucionar la vulnerabilidad por su cuenta y recomend\u00f3 hacer p\u00fablica la informaci\u00f3n sobre el problema, esperando recibir ayuda de la comunidad para desarrollar un parche. NETGEAR fue uno de los fabricantes que anunci\u00f3 el lanzamiento de una actualizaci\u00f3n que corrige la vulnerabilidad.<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57131\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 uClibc \u0438 uClibc-ng, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0438 \u043f\u043e\u0440\u0442\u0430\u0442\u0438\u0432\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0444\u0438\u043a\u0442\u0438\u0432\u043d\u044b\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u043a\u044d\u0448 DNS, \u0447\u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043f\u043e\u0434\u043c\u0435\u043d\u044b \u0432 \u043a\u044d\u0448\u0435 IP-\u0430\u0434\u0440\u0435\u0441\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u0434\u043e\u043c\u0435\u043d\u0430 \u0438 \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0439 \u043a \u0434\u043e\u043c\u0435\u043d\u0443 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 Linux-\u043f\u0440\u043e\u0448\u0438\u0432\u043a\u0438 \u0434\u043b\u044f \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432, \u0442\u043e\u0447\u0435\u043a \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0430-\u0432\u0435\u0449\u0435\u0439, \u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103951,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103950","post","type-post","status-publish","format-standard","has-post-thumbnail","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=\"\u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 uClibc \u0438 uClibc-ng, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0438 \u043f\u043e\u0440\u0442\u0430\u0442\u0438\u0432\u043d\u044b\u0445 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C uClibc y uClibc-ng, utilizadas en muchos dispositivos integrados y port\u00e1tiles, que permite inyectar datos falsos en la cach\u00e9 DNS.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"es_ES","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\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 uClibc \u0438 uClibc-ng, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c 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