{"id":100945,"date":"2021-08-08T16:22:46","date_gmt":"2021-08-08T14:22:47","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov"},"modified":"2021-08-08T16:22:46","modified_gmt":"2021-08-08T14:22:47","slug":"uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","title":{"rendered":"Vulnerabilidad en bibliotecas de red de los lenguajes Rust y Go que permite eludir la verificaci\u00f3n de direcciones IP.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Se han detectado vulnerabilidades en las bibliotecas est\u00e1ndar de los lenguajes Rust y Go, relacionadas con el manejo incorrecto de direcciones IP que contienen cifras octales en las funciones de an\u00e1lisis de direcciones. Estas vulnerabilidades permiten eludir las comprobaciones de direcciones v\u00e1lidas en aplicaciones, por ejemplo, para acceder a direcciones de bucle invertido (127.x.x.x) o subredes intranet en ataques SSRF (Server-side request forgery). Las vulnerabilidades contin\u00faan un ciclo de problemas previamente identificados en las bibliotecas node-netmask (JavaScript, CVE-2021-28918, CVE-2021-29418), private-ip (JavaScript, CVE-2020-28360), ipaddress (Python, CVE-2021-29921), Data::Validate::IP (Perl, CVE-2021-29662) y Net::Netmask (Perl, CVE-2021-29424). <\/p>\n

De acuerdo con la especificaci\u00f3n, los valores de cadena direcciones IP<\/a>, que comienzan con cero, deben ser interpretados como n\u00fameros octales, pero muchas bibliotecas no tienen en cuenta esta particularidad y simplemente deshacen el cero, tratando el valor como un n\u00famero decimal. Por ejemplo, el n\u00famero 0177 en sistema octal es igual a 127 en decimal. Un atacante puede solicitar un recurso especificando el valor «0177.0.0.1», que en representaci\u00f3n decimal corresponde a «127.0.0.1». En caso de utilizar una biblioteca problem\u00e1tica, la aplicaci\u00f3n no definir\u00e1 la inclusi\u00f3n de la direcci\u00f3n 0177.0.0.1 en la subred 127.0.0.1\/8, pero de hecho, al enviar la solicitud, puede realizar una llamada a la direcci\u00f3n «0177.0.0.1», que las funciones de red procesar\u00e1n como 127.0.0.1. De manera similar, se puede enga\u00f1ar la verificaci\u00f3n del acceso a direcciones intranet, especificando valores como «012.0.0.1» (equivalente a «10.0.0.1»). <\/p>\n

En Rust, el problema afecta a la biblioteca est\u00e1ndar «std::net» (CVE-2021-29922). El parser de direcciones IP de esta biblioteca deshecha el cero antes de los valores en la direcci\u00f3n, pero solo si se indican no m\u00e1s de tres d\u00edgitos; por ejemplo, «0177.0.0.1» ser\u00e1 considerado un valor inv\u00e1lido, mientras que para 010.8.8.8 y 127.0.026.1 se devolver\u00e1 un resultado incorrecto. Las aplicaciones que utilizan std::net::IpAddr al analizar las direcciones especificadas por el usuario son potencialmente vulnerables a ataques SSRF (Server-side request forgery), RFI (Remote File Inclusion) y LFI (Local File Inclusion). La vulnerabilidad fue corregida en la rama Rust 1.53.0.

\"Vulnerabilidad<\/center> <\/p>\n

En el lenguaje Go, el problema afecta a la biblioteca est\u00e1ndar «net» (CVE-2021-29923). La funci\u00f3n integrada net.ParseCIDR omite ceros antes de los n\u00fameros octales, en lugar de procesarlos. Por ejemplo, un atacante puede transmitir el valor 00000177.0.0.1, que al ser verificado en la funci\u00f3n net.ParseCIDR(00000177.0.0.1\/24) se analizar\u00e1 como 177.0.0.1\/24, y no como 127.0.0.1\/24. El problema tambi\u00e9n se manifiesta en la plataforma Kubernetes. La vulnerabilidad fue corregida en el lanzamiento de Go 1.16.3 y la versi\u00f3n beta 1.17.

\"Vulnerabilidad<\/center>
\r\n \"Reproducir\r\n
<\/div>\r\n <\/div><\/center>
\n
Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0440\u0430\u043d\u0435\u0435 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 node-netmask […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100946,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100945","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilidad en las bibliotecas de red de los lenguajes Rust y Go que permite eludir la verificaci\u00f3n de direcciones IP | ProHoster","description":"Se han detectado vulnerabilidades en las bibliotecas est\u00e1ndar de los lenguajes Rust y Go, relacionadas con el manejo incorrecto de direcciones IP que contienen d\u00edgitos octales en las funciones de an\u00e1lisis de direcciones.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","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 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 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