{"id":100782,"date":"2021-07-16T22:22:59","date_gmt":"2021-07-16T20:23:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ublock-origin-privodyashhaya-k-krahu-ili-ischerpaniyu-resursov"},"modified":"2021-07-16T22:22:59","modified_gmt":"2021-07-16T20:23:00","slug":"uyazvimost-v-ublock-origin-privodyashhaya-k-krahu-ili-ischerpaniyu-resursov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-v-ublock-origin-privodyashhaya-k-krahu-ili-ischerpaniyu-resursov","title":{"rendered":"Vulnerabilidade no uBlock Origin que leva a falhas ou esgotamento de recursos","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No sistema de bloqueio de conte\u00fado indesejado uBlock Origin, foi identificada uma vulnerabilidade que pode causar falhas ou esgotamento de mem\u00f3ria ao navegar por uma URL especialmente formatada, caso essa URL esteja sujeita a filtros de bloqueio rigoroso (\"strict blocking\"). A vulnerabilidade se manifesta apenas ao acessar diretamente a URL problem\u00e1tica, por exemplo, ao clicar em um link. <\/p>\n

A vulnerabilidade foi corrigida na atualiza\u00e7\u00e3o do uBlock Origin 1.36.2. Um problema semelhante tamb\u00e9m afeta a extens\u00e3o uMatrix, mas seu suporte foi interrompido e atualiza\u00e7\u00f5es n\u00e3o est\u00e3o mais sendo lan\u00e7adas. N\u00e3o existem solu\u00e7\u00f5es de contorno para prote\u00e7\u00e3o no uMatrix (inicialmente foi sugerido desativar todos os filtros de bloqueio rigoroso atrav\u00e9s da aba \"Assets\", mas essa recomenda\u00e7\u00e3o foi considerada insuficiente e problem\u00e1tica para usu\u00e1rios com suas pr\u00f3prias regras de bloqueio). No uMatrix, um fork do uMatrix do projeto Pale Moon, a vulnerabilidade foi corrigida na vers\u00e3o 4.4.9. <\/p>\n

O filtro de bloqueio estrito geralmente \u00e9 definido em n\u00edvel dom\u00ednios<\/a> e implica a proibi\u00e7\u00e3o de quaisquer conex\u00f5es, mesmo ao acessar diretamente um link. A vulnerabilidade \u00e9 causada pelo fato de que, ao acessar uma p\u00e1gina que se enquadra no filtro de bloqueio estrito, o usu\u00e1rio v\u00ea um aviso que fornece informa\u00e7\u00f5es sobre o recurso bloqueado, incluindo o URL e os par\u00e2metros da solicita\u00e7\u00e3o. O problema \u00e9 que o uBlock Origin analisa os par\u00e2metros da solicita\u00e7\u00e3o de forma recursiva e adiciona ao DOM sem levar em conta o n\u00edvel de aninhamento. <\/p>\n

Ao processar um URL especificamente formatado no uBlock Origin para Chrome, \u00e9 poss\u00edvel provocar uma falha no processo onde a extens\u00e3o do navegador \u00e9 executada. Ap\u00f3s a falha, at\u00e9 que o processo da extens\u00e3o seja reiniciado, o usu\u00e1rio permanece sem o bloqueio de conte\u00fado indesejado. No Firefox, observa-se esgotamento de mem\u00f3ria.

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

\u0412 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0435\u0436\u0435\u043b\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 uBlock Origin \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043a\u0440\u0430\u0445\u0430 \u0438\u043b\u0438 \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u0438 \u043d\u0430\u0432\u0438\u0433\u0430\u0446\u0438\u0438 \u043f\u043e \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u043c\u0443 URL, \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u043e\u0434\u043f\u0430\u0434\u0430\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u043e\u0433\u043e URL \u043f\u043e\u0434 \u0444\u0438\u043b\u044c\u0442\u0440\u044b \u0441\u0442\u0440\u043e\u0433\u043e\u0439 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0438 («strict blocking»). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438 \u043f\u0440\u044f\u043c\u043e\u043c \u043f\u0435\u0440\u0435\u0445\u043e\u0434\u0435 \u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043d\u044b\u0439 URL, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440 \u043f\u0440\u0438 \u043a\u043b\u0438\u043a\u0435 \u043f\u043e \u0441\u0441\u044b\u043b\u043a\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0438 uBlock Origin 1.36.2. 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