{"id":119440,"date":"2024-08-13T15:43:13","date_gmt":"2024-08-13T13:43:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-web-brauzerah-pozvolyayushhaya-atakovat-lokalnye-servisy-cherez-ip-0-0-0-0"},"modified":"2024-08-13T15:43:13","modified_gmt":"2024-08-13T13:43:15","slug":"uyazvimost-v-web-brauzerah-pozvolyayushhaya-atakovat-lokalnye-servisy-cherez-ip-0-0-0-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-v-web-brauzerah-pozvolyayushhaya-atakovat-lokalnye-servisy-cherez-ip-0-0-0-0","title":{"rendered":"Uma vulnerabilidade em navegadores da web que permite atacar servi\u00e7os locais atrav\u00e9s do IP 0.0.0.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A empresa Oligo Security publicou informa\u00e7\u00f5es sobre uma vulnerabilidade que afeta o Chrome, Firefox e Safari, permitindo contornar as restri\u00e7\u00f5es de acesso a servi\u00e7os de rede dispon\u00edveis apenas no sistema local, acessando pelo endere\u00e7o IP 0.0.0.0. Os primeiros avisos sobre essa vulnerabilidade foram publicados h\u00e1 18 anos, mas o problema ainda n\u00e3o foi corrigido. <\/p>\n

A vulnerabilidade, que se manifesta apenas em Linux e macOS, \u00e9 causada pelo fato de que o IP 0.0.0.0 nessas plataformas leva a uma conex\u00e3o com a interface de rede local (localhost), ou seja, enviar uma solicita\u00e7\u00e3o para 0.0.0.0 \u00e9 semelhante a solicitar o endere\u00e7o 127.0.0.1. Os navegadores modernos possuem mecanismos para impedir o acesso a 127.0.0.1 ao interagir com sites externos, pois isso pode ser utilizado para manipular servi\u00e7os internos no sistema do usu\u00e1rio, acess\u00edveis apenas por aplicativos locais. <\/p>\n

A vulnerabilidade permite contornar a proibi\u00e7\u00e3o de acesso a 127.0.0.1 e organizar um ataque a servi\u00e7os internos ao abrir uma p\u00e1gina externa controlada pelo atacante no navegador. Ao acessar atrav\u00e9s de 0.0.0.0, os mecanismos CORS (Cross-Origin Resource Sharing) e PNA (Private Network Access) n\u00e3o conseguem impedir a realiza\u00e7\u00e3o desse tipo de ataque. Observa-se que o problema n\u00e3o \u00e9 t\u00e3o inofensivo quanto parece e j\u00e1 est\u00e1 sendo explorado por criminosos em ataques reais, explorando vulnerabilidades cr\u00edticas em aplicativos de servidor que s\u00f3 est\u00e3o acess\u00edveis para o sistema local.

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

Por exemplo, o uso de 0.0.0.0 para acessar servi\u00e7os locais foi registrado nos ataques ShadowRay e Selenium Grid, identificados em mar\u00e7o e julho, que foram usados para executar c\u00f3digo em sistemas de desenvolvedores. No ataque ShadowRay, o alvo eram os sistemas de desenvolvedores que usavam o framework de IA Ray. O segundo ataque visou explorar uma vulnerabilidade cr\u00edtica na plataforma Selenium Grid em configura\u00e7\u00f5es que aceitam solicita\u00e7\u00f5es apenas do host local. <\/p>\n

Al\u00e9m disso, menciona-se a possibilidade de aplicar o m\u00e9todo para explorar a vulnerabilidade ShellTorch em servidor<\/a> PyTorch TorchServe, utilizado em computadores de desenvolvedores de aplicativos de IA. O acesso a servi\u00e7os de rede do host local tamb\u00e9m pode ser usado para escanear portas de rede para identifica\u00e7\u00e3o indireta do usu\u00e1rio. <\/p>\n

Os desenvolvedores do Firefox prepararam uma altera\u00e7\u00e3o na especifica\u00e7\u00e3o para a chamada Fetch, que pro\u00edbe o acesso a 0.0.0.0, mas ainda n\u00e3o definiram quando a bloqueio come\u00e7ar\u00e1 no navegador. No Chrome, o acesso a 0.0.0.0 deve come\u00e7ar a ser bloqueado na vers\u00e3o Chrome 128, prevista para a pr\u00f3xima semana. No Safari, o bloqueio de 0.0.0.0 est\u00e1 planejado para a vers\u00e3o Safari 18.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Oligo Security \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0435\u0439 Chrome, Firefox \u0438 Safari, \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u0431\u043e\u0439\u0442\u0438 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0441\u0435\u0442\u0435\u0432\u044b\u043c \u0441\u043b\u0443\u0436\u0431\u0430\u043c, \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b\u043c \u0442\u043e\u043b\u044c\u043a\u043e \u043d\u0430 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0447\u0435\u0440\u0435\u0437 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u043f\u043e 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