{"id":37112,"date":"2019-10-31T22:15:49","date_gmt":"2019-10-31T19:15:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/http-zagolovok-alt-svc-mozhet-primenyatsya-dlya-skanirovaniya-portov-vnutrennej-seti\/"},"modified":"2019-10-31T22:15:49","modified_gmt":"2019-10-31T19:15:49","slug":"http-zagolovok-alt-svc-mozhet-primenyatsya-dlya-skanirovaniya-portov-vnutrennej-seti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/http-zagolovok-alt-svc-mozhet-primenyatsya-dlya-skanirovaniya-portov-vnutrennej-seti","title":{"rendered":"O cabe\u00e7alho HTTP Alt-Svc pode ser usado para escanear portas de redes internas","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Pesquisadores da Universidade de Boston <noindex><a rel=\"nofollow\" href=\"https:\/\/www.usenix.org\/conference\/woot19\/presentation\/tiwari\">desenvolveram<\/a><\/noindex> m\u00e9todo de ataque<br \/>\n(CVE-2019-11728), <noindex><a rel=\"nofollow\" href=\"https:\/\/www.usenix.org\/system\/files\/woot19-paper_tiwari.pdf\">permitindo<\/a><\/noindex> pode realizar a varredura de endere\u00e7os IP e portas de rede abertas na rede interna do usu\u00e1rio, protegida por um firewall contra a rede externa, ou no sistema atual (localhost). O ataque pode ser realizado ao abrir uma p\u00e1gina especialmente formatada no navegador. A t\u00e9cnica proposta \u00e9 baseada na utiliza\u00e7\u00e3o do cabe\u00e7alho HTTP <noindex><a rel=\"nofollow\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Headers\/Alt-Svc\">Alt-Svc<\/a><\/noindex> (HTTP Alternate Services, <noindex><a rel=\"nofollow\" href=\"https:\/\/datatracker.ietf.org\/doc\/rfc7838\/\">RFC-7838<\/a><\/noindex>). O problema se manifesta no Firefox, Chrome e navegadores baseados em seus motores, incluindo Tor Browser e Brave.<\/p>\n<p>O cabe\u00e7alho Alt-Svc permite que o servidor defina uma maneira alternativa de se conectar ao site e instrua o navegador a redirecionar a solicita\u00e7\u00e3o para um novo host, por exemplo, para balanceamento de carga. Tamb\u00e9m \u00e9 poss\u00edvel especificar uma porta de rede para tunelamento, por exemplo, especificar 'Alt-Svc: http\/1.1=\"other.example.com:443\";ma=200' instrui o cliente a se conectar ao host other.example.org para obter a p\u00e1gina solicitada, utilizando a porta de rede 443 e o protocolo HTTP\/1.1. O par\u00e2metro 'ma' define o tempo m\u00e1ximo de validade do redirecionamento. Al\u00e9m do HTTP\/1.1, os protocolos suportados incluem HTTP\/2-over-TLS (h2), HTTP\/2-over plain text (h2c), SPDY (spdy) e QUIC (quic), que utiliza UDP.<\/p>\n<p><center><img decoding=\"async\" alt=\"O cabe\u00e7alho HTTP Alt-Svc pode ser usado para escanear portas de redes internas\" src=\"\/wp-content\/uploads\/2019\/08\/20a9c58c37c506b07a80703760a52bfc.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>Para escanear os endere\u00e7os, o site do atacante pode sequencialmente percorrer endere\u00e7os de interesse da rede interna e portas de rede, usando como indicador o tempo de atraso entre as solicita\u00e7\u00f5es repetidas.<br \/>\nNa aus\u00eancia do recurso redirecionado, o navegador instantaneamente recebe um pacote RST em resposta e imediatamente marca o servi\u00e7o alternativo como indispon\u00edvel, zerando o tempo de vida do redirecionamento especificado na solicita\u00e7\u00e3o.<br \/>\nSe a porta de rede estiver aberta, levar\u00e1 mais tempo para concluir a conex\u00e3o (uma tentativa de estabelecer a conex\u00e3o ser\u00e1 feita com a troca correspondente de pacotes) e o navegador n\u00e3o reagir\u00e1 instantaneamente. <\/p>\n<p>Para obter informa\u00e7\u00f5es sobre a verifica\u00e7\u00e3o, o atacante pode imediatamente redirecionar o usu\u00e1rio para uma segunda p\u00e1gina, que no cabe\u00e7alho Alt-Svc ir\u00e1 referenciar um host funcional do atacante. Se o navegador do cliente enviar uma solicita\u00e7\u00e3o para esta p\u00e1gina, pode-se considerar que o redirecionamento da primeira solicita\u00e7\u00e3o Alt-Svc foi cancelado e o host e porta verificados n\u00e3o est\u00e3o dispon\u00edveis. Se nenhuma solicita\u00e7\u00e3o foi feita, significa que os dados do primeiro redirecionamento ainda n\u00e3o expiraram e a conex\u00e3o foi estabelecida. <\/p>\n<p>O m\u00e9todo indicado tamb\u00e9m permite verificar portas de rede, que est\u00e3o na lista negra do navegador, como as portas de servidores de e-mail. O ataque em funcionamento \u00e9 preparado utilizando a substitui\u00e7\u00e3o de iframe no tr\u00e1fego da v\u00edtima e aplicando o protocolo HTTP\/2 no Alt-Svc para Firefox e QUIC para escaneamento de portas UDP no Chrome. No Tor Browser, o ataque n\u00e3o pode ser aplicado no contexto de uma rede interna e localhost, mas \u00e9 adequado para organizar um escaneamento oculto de hosts externos atrav\u00e9s do n\u00f3 de sa\u00edda do Tor. O problema com o escaneamento de portas j\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mozilla.org\/en-US\/security\/advisories\/mfsa2019-21\/\">no lan\u00e7amento<\/a><\/noindex> no Firefox 68.<\/p>\n<p>O cabe\u00e7alho Alt-Svc tamb\u00e9m pode ser aplicado:<\/p>\n<ul>\n<li class=\"l\"> Na organiza\u00e7\u00e3o de ataques DDoS. Por exemplo, para TLS, o redirecionamento pode fornecer um n\u00edvel de amplifica\u00e7\u00e3o de 60 vezes, j\u00e1 que a solicita\u00e7\u00e3o inicial do cliente ocupa 500 bytes, e a resposta com o certificado \u00e9 de cerca de 30 KB. Gerando tais solicita\u00e7\u00f5es em loop em m\u00faltiplos sistemas clientes, pode-se esgotar os recursos de rede dispon\u00edveis do servidor;\n<p><center><img decoding=\"async\" alt=\"O cabe\u00e7alho HTTP Alt-Svc pode ser usado para escanear portas de redes internas\" src=\"\/wp-content\/uploads\/2019\/08\/78f00dbe7eb06470e58eede203abb8e7.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<li class=\"l\"> Para contornar mecanismos de prote\u00e7\u00e3o contra phishing e malware, fornecidos por servi\u00e7os como Safe Browsing (o redirecionamento para um host malicioso n\u00e3o leva \u00e0 exibi\u00e7\u00e3o de um aviso);\n<li class=\"l\"> Para organizar o rastreamento do movimento do usu\u00e1rio. A ess\u00eancia do m\u00e9todo est\u00e1 na substitui\u00e7\u00e3o de iframe, que se refere no Alt-Svc a um manipulador externo de rastreamento de movimento, cuja chamada \u00e9 realizada independentemente da ativa\u00e7\u00e3o das ferramentas de prote\u00e7\u00e3o contra rastreadores. Tamb\u00e9m \u00e9 poss\u00edvel o rastreamento no n\u00edvel dos provedores atrav\u00e9s do uso em Alt-Svc de um identificador \u00fanico (endere\u00e7os IP aleat\u00f3rios:porta como identificador) com sua an\u00e1lise posterior no tr\u00e1fego de tr\u00e2nsito;\n<p><center><img decoding=\"async\" alt=\"O cabe\u00e7alho HTTP Alt-Svc pode ser usado para escanear portas de redes internas\" src=\"\/wp-content\/uploads\/2019\/08\/a7d81a5066534a3f20ea54f874e9b475.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<center><img decoding=\"async\" alt=\"O cabe\u00e7alho HTTP Alt-Svc pode ser usado para escanear portas de redes internas\" src=\"\/wp-content\/uploads\/2019\/08\/be310d5a2a209f521dd257b3cb052757.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<li class=\"l\"> Para extrair informa\u00e7\u00f5es sobre o hist\u00f3rico de movimenta\u00e7\u00f5es. Ao inserir um iframe em sua p\u00e1gina com uma solicita\u00e7\u00e3o de imagem de um site espec\u00edfico que utiliza Alt-Svc, e analisando o estado do Alt-Svc no tr\u00e1fego, um atacante com capacidade de an\u00e1lise de tr\u00e1fego de tr\u00e2nsito pode concluir que o usu\u00e1rio j\u00e1 visitou o site mencionado anteriormente;\n<li class=\"l\"> Ofusca\u00e7\u00e3o de logs de sistemas de detec\u00e7\u00e3o de intrus\u00f5es. Atrav\u00e9s do Alt-Svc, \u00e9 poss\u00edvel gerar uma onda de solicita\u00e7\u00f5es a sistemas maliciosos em nome do usu\u00e1rio e criar a apar\u00eancia de ataques falsos para ocultar entre o volume total de informa\u00e7\u00f5es sobre um ataque real.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51278\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0411\u043e\u0441\u0442\u043e\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 (CVE-2019-11728), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0438\u0442\u044c \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 IP-\u0430\u0434\u0440\u0435\u0441\u043e\u0432 \u0438 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u043e\u0440\u0442\u043e\u0432 \u0432\u043e \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0439 \u0441\u0435\u0442\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u043e\u0442\u0433\u043e\u0440\u043e\u0436\u0435\u043d\u043d\u043e\u0439 \u043e\u0442 \u0432\u043d\u0435\u0448\u043d\u0435\u0439 \u0441\u0435\u0442\u0438 \u043c\u0435\u0436\u0441\u0435\u0442\u0435\u0432\u044b\u043c \u044d\u043a\u0440\u0430\u043d\u043e\u043c, \u0438\u043b\u0438 \u043d\u0430 \u0442\u0435\u043a\u0443\u0449\u0435\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 (localhost). \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u043f\u0440\u0438 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u0438 \u0432 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0439 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b. \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0438 HTTP-\u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u0430 Alt-Svc (HTTP Alternate Services, RFC-7838). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27822,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-37112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0411\u043e\u0441\u0442\u043e\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 (CVE-2019-11728),\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta 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\u0434\u043b\u044f \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u043e\u0440\u0442\u043e\u0432 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0439 \u0441\u0435\u0442\u0438 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0411\u043e\u0441\u0442\u043e\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 (CVE-2019-11728),\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/pt\/blog\/news\/http-zagolovok-alt-svc-mozhet-primenyatsya-dlya-skanirovaniya-portov-vnutrennej-seti\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta 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(CVE-2019-11728),","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/http-zagolovok-alt-svc-mozhet-primenyatsya-dlya-skanirovaniya-portov-vnutrennej-seti","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\udd47HTTP-\u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043e\u043a Alt-Svc \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u043e\u0440\u0442\u043e\u0432 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