{"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\/pt\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","title":{"rendered":"Vulnerabilidade em bibliotecas de rede das linguagens Rust e Go, permitindo contornar a verifica\u00e7\u00e3o de endere\u00e7os IP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Foram identificadas vulnerabilidades nas bibliotecas padr\u00e3o das linguagens Rust e Go relacionadas ao processamento inadequado de endere\u00e7os IP com d\u00edgitos octais nas fun\u00e7\u00f5es de an\u00e1lise de endere\u00e7o. As vulnerabilidades permitem contornar as verifica\u00e7\u00f5es de endere\u00e7os v\u00e1lidos em aplicativos, como, por exemplo, para facilitar o acesso a endere\u00e7os da interface de loopback (127.x.x.x) ou sub-redes intranet durante ataques SSRF (Server-side request forgery). As vulnerabilidades continuam o ciclo de problemas anteriormente identificados nas 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) e Net::Netmask (Perl, CVE-2021-29424). <\/p>\n

De acordo com a especifica\u00e7\u00e3o, valores de string endere\u00e7os IP<\/a>, que come\u00e7am com zero, devem ser interpretados como n\u00fameros octais, mas muitas bibliotecas n\u00e3o levam em conta essa particularidade e simplesmente descartam o zero, tratando o valor como um n\u00famero decimal. Por exemplo, o n\u00famero 0177 no sistema octal \u00e9 igual a 127 no decimal. Um atacante pode solicitar um recurso, indicando o valor «0177.0.0.1», que na representa\u00e7\u00e3o decimal corresponde a «127.0.0.1». No caso de usar uma biblioteca problem\u00e1tica, o aplicativo n\u00e3o identificar\u00e1 a entrada do endere\u00e7o 0177.0.0.1 na sub-rede 127.0.0.1\/8, mas, de fato, ao enviar a solicita\u00e7\u00e3o pode acessar o endere\u00e7o «0177.0.0.1», que as fun\u00e7\u00f5es de rede processar\u00e3o como 127.0.0.1. De forma semelhante, \u00e9 poss\u00edvel enganar a verifica\u00e7\u00e3o de acessos a endere\u00e7os da intranet, indicando valores como «012.0.0.1» (equivalente a «10.0.0.1»). <\/p>\n

No Rust, o problema afetou a biblioteca padr\u00e3o «std::net» (CVE-2021-29922). O parser de endere\u00e7os IP dessa biblioteca descartava o zero antes dos valores do endere\u00e7o, mas apenas se fossem indicados n\u00e3o mais que tr\u00eas d\u00edgitos. Por exemplo, «0177.0.0.1» seria interpretado como um valor inv\u00e1lido, enquanto que a resposta para 010.8.8.8 e 127.0.026.1 retornaria um resultado incorreto. Aplicativos que usam std::net::IpAddr ao analisar endere\u00e7os fornecidos pelo usu\u00e1rio est\u00e3o potencialmente vulner\u00e1veis a ataques SSRF (Server-side request forgery), RFI (Remote File Inclusion) e LFI (Local File Inclusion). A vulnerabilidade foi corrigida na vers\u00e3o do Rust 1.53.0.

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

Na linguagem Go, o problema afeta a biblioteca padr\u00e3o «net» (CVE-2021-29923). A fun\u00e7\u00e3o embutida net.ParseCIDR ignora zeros antes de n\u00fameros octais, em vez de process\u00e1-los. Por exemplo, um atacante pode enviar o valor 00000177.0.0.1, que ao ser verificado na fun\u00e7\u00e3o net.ParseCIDR(00000177.0.0.1\/24) ser\u00e1 analisado como 177.0.0.1\/24, e n\u00e3o como 127.0.0.1\/24. O problema tamb\u00e9m se manifesta na plataforma Kubernetes. A vulnerabilidade foi corrigida na vers\u00e3o do Go 1.16.3 e na vers\u00e3o beta 1.17.

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

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endere\u00e7os IP com d\u00edgitos octais nas fun\u00e7\u00f5es de an\u00e1lise de endere\u00e7os foram identificadas nas bibliotecas padr\u00e3o das linguagens Rust e Go.","canonical_url":"https:\/\/prohoster.info\/pt\/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":"pt_PT","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 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