{"id":53188,"date":"2019-11-26T00:00:00","date_gmt":"2019-11-25T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/v-ublock-origin-dobavlena-zashhita-ot-novogo-metoda-otslezhivaniya-manipuliruyushhego-imenami-v-dns"},"modified":"2020-02-18T14:01:04","modified_gmt":"2020-02-18T11:01:04","slug":"v-ublock-origin-dobavlena-zashhita-ot-novogo-metoda-otslezhivaniya-manipuliruyushhego-imenami-v-dns","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/v-ublock-origin-dobavlena-zashhita-ot-novogo-metoda-otslezhivaniya-manipuliruyushhego-imenami-v-dns","title":{"rendered":"O uBlock Origin adicionou prote\u00e7\u00e3o contra um novo m\u00e9todo de rastreamento que manipula nomes no DNS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Usu\u00e1rios do uBlock Origin notamos<\/a><\/noindex> uso por redes de an\u00fancios e sistemas de web analytics de uma nova t\u00e9cnica de rastreamento de movimentos e inser\u00e7\u00e3o de blocos de an\u00fancios que n\u00e3o \u00e9 bloqueada no uBlock Origin e em outras extens\u00f5es de filtragem de conte\u00fado indesejado. <\/p>\n

A ess\u00eancia do m\u00e9todo \u00e9 que os propriet\u00e1rios de sites que desejam incorporar c\u00f3digo para rastreamento ou exibi\u00e7\u00e3o de an\u00fancios criam um subdom\u00ednio separado no DNS que aponta para o servidor da rede de an\u00fancios ou de web analytics (por exemplo, \u00e9 criada uma entrada CNAME f7ds.liberation.fr que aponta para o servidor de rastreamento liberation.eulerian.net). Assim, o c\u00f3digo publicit\u00e1rio \u00e9 formalmente carregado do mesmo dom\u00ednio prim\u00e1rio que o site e, portanto, n\u00e3o \u00e9 sujeito a bloqueio. O nome do subdom\u00ednio \u00e9 escolhido na forma de um identificador aleat\u00f3rio, o que dificulta o bloqueio por m\u00e1scara, pois o subdom\u00ednio vinculado \u00e0 rede de an\u00fancios \u00e9 dif\u00edcil de distinguir de subdom\u00ednios que carregam outros recursos locais da p\u00e1gina. <\/p>\n

Desenvolvedor do uBlock Origin um patch escrito \u00e0 m\u00e3o para corre\u00e7\u00e3o.<\/a><\/noindex> utilizados resolu\u00e7\u00e3o<\/a><\/noindex> de nome no DNS para identificar o host associado via CNAME. O m\u00e9todo implementado<\/a><\/noindex> come\u00e7ando com
\nlan\u00e7amento experimental uBlock Origin 1.24.1b3<\/a><\/noindex> para Firefox<\/a><\/noindex>. Para ativar a verifica\u00e7\u00e3o nas configura\u00e7\u00f5es avan\u00e7adas, deve-se definir o valor de cnameAliasList como «*». Nesse caso, todas as verifica\u00e7\u00f5es nas listas negras ser\u00e3o duplicadas para os nomes definidos por meio de CNAME. Ao instalar a atualiza\u00e7\u00e3o, ser\u00e1 necess\u00e1rio fornecer permiss\u00f5es para acessar informa\u00e7\u00f5es do DNS.<\/p>\n

\"O<\/a><\/noindex><\/center><\/p>\n

Para o Chrome, a verifica\u00e7\u00e3o de CNAME n\u00e3o pode ser adicionada, pois a API dns.resolve()<\/a><\/noindex> est\u00e1 dispon\u00edvel apenas para extens\u00f5es no Firefox e n\u00e3o \u00e9 suportada no Chrome. Em termos de desempenho, a identifica\u00e7\u00e3o de CNAME n\u00e3o deve resultar em despesas adicionais, al\u00e9m do uso de recursos de CPU para re-aplicar regras a outro nome, j\u00e1 que, ao acessar um recurso, o navegador j\u00e1 executou a resolu\u00e7\u00e3o e o valor deve ser armazenado em cache. O m\u00e9todo de prote\u00e7\u00e3o pode ser contornado por meio de um v\u00ednculo direto do nome ao IP sem usar CNAME, mas essa abordagem complica a manuten\u00e7\u00e3o (no caso de mudan\u00e7a de endere\u00e7o IP da rede de an\u00fancios, seria necess\u00e1rio garantir a altera\u00e7\u00e3o dos dados em todos os servidores DNS dos editores) e pode ser contornada atrav\u00e9s da cria\u00e7\u00e3o de uma lista negra de endere\u00e7os IP de rastreadores.<\/p>\n

<\/a><\/noindex><\/p>\n

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

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