Os desenvolvedores da plataforma de comunica\u00e7\u00f5es descentralizadas Matrix alertaram sobre a descoberta de vulnerabilidades cr\u00edticas nas bibliotecas matrix-js-sdk, matrix-ios-sdk e matrix-android-sdk2, permitindo que administradores de servidores se passassem por outros usu\u00e1rios e lessem mensagens em chats com criptografia de ponta a ponta (E2EE). As vulnerabilidades foram causadas por erros em implementa\u00e7\u00f5es espec\u00edficas do protocolo Matrix e n\u00e3o s\u00e3o problemas do pr\u00f3prio protocolo. Atualmente, o projeto lan\u00e7ou atualiza\u00e7\u00f5es para os SDK problem\u00e1ticos e para algumas aplica\u00e7\u00f5es cliente desenvolvidas com base neles. <\/p>\n
Para que um ataque seja bem-sucedido, \u00e9 necess\u00e1rio o acesso ao servidor dom\u00e9stico controlado pelo atacante servidor<\/a> (homeserver \u2014 servidor para armazenamento de hist\u00f3rico e contas de clientes). A aplica\u00e7\u00e3o de criptografia de ponta a ponta do lado do cliente impede que o administrador servidor<\/a> interfira na troca de mensagens, mas as vulnerabilidades descobertas possibilitam contornar essa prote\u00e7\u00e3o. Os problemas afetam o cliente principal do Matrix, Element (anteriormente Riot), para Web, sistemas desktop, iOS e Android, bem como aplica\u00e7\u00f5es cliente de terceiros, incluindo Cinny, Beeper, SchildiChat, Circuli e Synod.im. As vulnerabilidades n\u00e3o se manifestam nas bibliotecas matrix-rust-sdk, hydrogen-sdk, Matrix Dart SDK, mautrix-python, mautrix-go e matrix-nio, assim como em aplica\u00e7\u00f5es como Hydrogen, ElementX, Nheko, FluffyChat, Syphon, Timmy, Gomuks e Pantalaimon. <\/p>\n Tr\u00eas cen\u00e1rios principais de ataque s\u00e3o identificados: <\/p>\n Pesquisadores que identificaram a vulnerabilidade tamb\u00e9m demonstraram ataques que levam \u00e0 adi\u00e7\u00e3o de um usu\u00e1rio externo ao chat ou \u00e0 anexa\u00e7\u00e3o de um dispositivo estranho a um usu\u00e1rio. Os ataques se baseiam no fato de que as mensagens de servi\u00e7o usadas para adicionar usu\u00e1rios ao chat n\u00e3o est\u00e3o vinculadas \u00e0s chaves do criador do chat e podem ser geradas pelo administrador do servidor. Os desenvolvedores do projeto Matrix classificaram essas vulnerabilidades como de baixo impacto, uma vez que tais manipula\u00e7\u00f5es n\u00e3o passar\u00e3o despercebidas \u2014 no caso de substitui\u00e7\u00e3o de usu\u00e1rio, ele aparecer\u00e1 na lista de usu\u00e1rios do chat, e ao adicionar um dispositivo, um aviso ser\u00e1 exibido, e o dispositivo ser\u00e1 marcado como n\u00e3o verificado (ap\u00f3s a adi\u00e7\u00e3o, as chaves compartilhadas necess\u00e1rias para descriptografar mensagens come\u00e7ar\u00e3o a ser enviadas para o dispositivo alternativo). \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b \u0434\u0435\u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043c\u0443\u043d\u0438\u043a\u0430\u0446\u0438\u0439 Matrix \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0438 \u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 matrix-js-sdk, matrix-ios-sdk \u0438 matrix-android-sdk2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u0430\u043c \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0432\u044b\u0434\u0430\u0432\u0430\u0442\u044c \u0441\u0435\u0431\u044f \u0437\u0430 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438 \u0447\u0438\u0442\u0430\u0442\u044c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0432 \u0447\u0430\u0442\u0430\u0445 \u0441\u043e \u0441\u043a\u0432\u043e\u0437\u043d\u044b\u043c \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u043c (E2EE). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432\u044b\u0437\u0432\u0430\u043d\u044b \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 Matrix \u0438 \u043d\u0435 \u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u0441\u0430\u043c\u043e\u0433\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430. \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f, \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u0432\u044b\u043f\u0443\u0449\u0435\u043d\u044b \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043d\u044b\u0445 SDK […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-105214","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilidades cr\u00edticas que comprometem a criptografia de ponta a ponta em muitos clientes Matrix | ProHoster","description":"Os desenvolvedores da plataforma de comunica\u00e7\u00f5es descentralizadas Matrix alertaram sobre a descoberta de vulnerabilidades cr\u00edticas nas bibliotecas matrix-js-sdk, matrix-ios-sdk e matrix-android-sdk2, que permitem que administradores de servidores as 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"