{"id":101267,"date":"2021-09-14T16:22:48","date_gmt":"2021-09-14T14:22:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-klientah-matrix-pozvolyayushhie-raskryt-klyuchi-skvoznogo-shifrovaniya"},"modified":"2021-09-14T16:22:48","modified_gmt":"2021-09-14T14:22:48","slug":"uyazvimosti-v-klientah-matrix-pozvolyayushhie-raskryt-klyuchi-skvoznogo-shifrovaniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimosti-v-klientah-matrix-pozvolyayushhie-raskryt-klyuchi-skvoznogo-shifrovaniya","title":{"rendered":"Vulnerabilidades nos clientes Matrix que permitem revelar chaves de criptografia de ponta a ponta","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Foram identificadas vulnerabilidades (CVE-2021-40823, CVE-2021-40824) na maioria dos aplicativos cliente da plataforma de comunica\u00e7\u00f5es descentralizadas Matrix, que permitem obter informa\u00e7\u00f5es sobre as chaves usadas para enviar mensagens em chats com criptografia de ponta a ponta (E2EE). Um invasor que comprometer um dos usu\u00e1rios do chat pode decifrar mensagens enviadas anteriormente para esse usu\u00e1rio a partir de aplicativos clientes vulner\u00e1veis. <\/p>\n

Para a explora\u00e7\u00e3o bem-sucedida, \u00e9 necess\u00e1rio ter acesso \u00e0 conta do destinat\u00e1rio das mensagens. O acesso pode ser obtido tanto por meio de vazamento dos par\u00e2metros da conta quanto pela invas\u00e3o do servidor Matrix ao qual o usu\u00e1rio est\u00e1 conectado. As vulnerabilidades representam o maior perigo para usu\u00e1rios de salas de chat criptografadas conectadas a servidores Matrix controlados por invasores. Administradores desse tipo de servidores<\/a> podem tentar se passar por usu\u00e1rios do servidor para interceptar mensagens enviadas para o chat a partir de aplicativos clientes vulner\u00e1veis. <\/p>\n

As vulnerabilidades s\u00e3o causadas por erros l\u00f3gicos nas implementa\u00e7\u00f5es do mecanismo de concess\u00e3o de acesso repetido \u00e0s chaves, propostas em matrix-js-sdk < 12.4.1 (CVE-2021-40823), matrix-android-sdk2 < 1.2.2 (CVE-2021-40824), matrix-rust-sdk < 0.4.0, FamedlySDK < 0.5.0 e Nheko \u2264 0.8.2. Implementa\u00e7\u00f5es que usam as bibliotecas matrix-ios-sdk, matrix-nio e libolm n\u00e3o est\u00e3o sujeitas \u00e0s vulnerabilidades. <\/p>\n

Consequentemente, as vulnerabilidades se manifestam em todos os aplicativos que copiaram o c\u00f3digo problem\u00e1tico e n\u00e3o afetam diretamente os protocolos Matrix e Olm\/Megolm. Em particular, o problema afeta o cliente Matrix principal Element (anteriormente Riot) para Web, sistemas desktop e Android, bem como aplicativos clientes de terceiros e bibliotecas, incluindo FluffyChat, Nheko, Cinny e SchildiChat. O problema n\u00e3o se manifesta no cliente oficial para a plataforma iOS, nem em aplicativos como Chatty, Hydrogen, mautrix, purple-matrix e Syphon. <\/p>\n

As vulnerabilidades foram identificadas durante uma auditoria de seguran\u00e7a do cliente Element. As corre\u00e7\u00f5es j\u00e1 foram lan\u00e7adas para todos os clientes problem\u00e1ticos. Os usu\u00e1rios s\u00e3o recomendados a instalar as atualiza\u00e7\u00f5es urgentemente e, at\u00e9 que a atualiza\u00e7\u00e3o seja instalada, colocar os clientes em modo offline. N\u00e3o foram encontrados ind\u00edcios de explora\u00e7\u00e3o das vulnerabilidades antes da publica\u00e7\u00e3o das corre\u00e7\u00f5es. De acordo com os registros normais do cliente e servidor<\/a> Determinar o fato de um ataque \u00e9 imposs\u00edvel, mas como um ataque requer a compromiss\u00e3o da conta, os administradores podem analisar a exist\u00eancia de logins suspeitos nos logs de autentica\u00e7\u00e3o em seus servidores, enquanto os usu\u00e1rios podem avaliar a lista de dispositivos vinculados \u00e0 sua conta quanto a reconex\u00f5es recentes e altera\u00e7\u00f5es no status de confian\u00e7a. <\/p>\n

O mecanismo de compartilhamento de chaves (key sharing), em cuja implementa\u00e7\u00e3o foram encontradas vulnerabilidades, permite que um cliente que n\u00e3o possui chaves para decifrar a mensagem solicite chaves ao dispositivo emissor ou a outros de seus dispositivos. Por exemplo, essa capacidade \u00e9 necess\u00e1ria para garantir a decodifica\u00e7\u00e3o de mensagens antigas em um novo dispositivo do usu\u00e1rio ou em caso de perda das chaves existentes. A especifica\u00e7\u00e3o do protocolo determina que, por padr\u00e3o, n\u00e3o se deve responder a solicita\u00e7\u00f5es de chaves e que estas devem ser enviadas automaticamente apenas para dispositivos verificados do mesmo usu\u00e1rio. Infelizmente, nas implementa\u00e7\u00f5es pr\u00e1ticas, essa exig\u00eancia n\u00e3o foi atendida e as solicita\u00e7\u00f5es de envio de chaves foram tratadas sem a devida identifica\u00e7\u00e3o do dispositivo.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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-101267","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 em clientes Matrix, permitindo a revela\u00e7\u00e3o de chaves de criptografia de ponta a ponta | ProHoster","description":"Vulnerabilidades foram identificadas na maioria dos aplicativos clientes para a plataforma de comunica\u00e7\u00f5es descentralizadas Matrix (CVE-2021-40823, CVE-2021-40824), permitindo acesso a informa\u00e7\u00f5es sobre as chaves usadas para 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