{"id":91429,"date":"2020-08-13T13:42:00","date_gmt":"2020-08-13T11:42:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ataka-revolte-pozvolyayushhaya-perehvatit-zashifrovannye-zvonki-v-lte"},"modified":"2020-08-13T13:42:00","modified_gmt":"2020-08-13T11:42:00","slug":"ataka-revolte-pozvolyayushhaya-perehvatit-zashifrovannye-zvonki-v-lte","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/ataka-revolte-pozvolyayushhaya-perehvatit-zashifrovannye-zvonki-v-lte","title":{"rendered":"Ataque ReVoLTE, permitindo interceptar chamadas criptografadas em LTE","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Um grupo de pesquisadores da Universidade de Bochum (Alemanha) apresentou uma t\u00e9cnica de ataque ReVoLTE<\/a><\/noindex> (PDF<\/a><\/noindex>), que permite interceptar chamadas de voz criptografadas em redes m\u00f3veis 4G\/LTE que utilizam a tecnologia VoLTE para a transmiss\u00e3o do tr\u00e1fego de voz (Voz sobre LTE<\/a><\/noindex>).
\n.<\/p>\n

Para proteger as chamadas telef\u00f4nicas contra intercepta\u00e7\u00e3o em VoLTE, \u00e9 utilizado um sistema de criptografia entre o cliente e o operador baseado em stream cipher<\/a><\/noindex>. A especifica\u00e7\u00e3o determina a gera\u00e7\u00e3o de um fluxo de chaves \u00fanico para cada sess\u00e3o, mas como foi revelado pelos pesquisadores, 12 de 15 esta\u00e7\u00f5es base testadas n\u00e3o seguem esta condi\u00e7\u00e3o e reutilizam o mesmo fluxo de chaves para duas chamadas consecutivas em um \u00fanico canal de r\u00e1dio ou utilizam m\u00e9todos previs\u00edveis para gerar uma nova sequ\u00eancia.<\/p>\n

A reutiliza\u00e7\u00e3o do fluxo de chaves permite que um invasor decifre o tr\u00e1fego criptografado gravado da conversa. Para decifrar o conte\u00fado da chamada de voz, o invasor primeiro intercepta e salva o tr\u00e1fego de r\u00e1dio criptografado entre a v\u00edtima e a esta\u00e7\u00e3o base vulner\u00e1vel. Ap\u00f3s o t\u00e9rmino da chamada, o invasor liga de volta para a v\u00edtima e tenta prolongar a conversa o m\u00e1ximo poss\u00edvel, sem permitir que a v\u00edtima desligue. Durante essa conversa, al\u00e9m de gravar o tr\u00e1fego de r\u00e1dio criptografado, tamb\u00e9m \u00e9 capturado o sinal de \u00e1udio original n\u00e3o criptografado.<\/p>\n

Para decifrar a primeira chamada da v\u00edtima, o invasor, com base no tr\u00e1fego criptografado interceptado na segunda chamada e nos dados de voz originais gravados no telefone do invasor, pode calcular o valor do fluxo de chaves, que \u00e9 determinado por meio da opera\u00e7\u00e3o XOR entre os dados abertos e criptografados. Como o fluxo de chaves \u00e9 reutilizado, aplicando o fluxo de chaves calculado para a segunda chamada aos dados criptografados da primeira chamada, o invasor pode acessar seu conte\u00fado original. Quanto mais longa for a conversa entre o invasor e a v\u00edtima, mais informa\u00e7\u00f5es da primeira chamada podem ser decifradas. Por exemplo, se o invasor conseguiu prolongar a conversa por 5 minutos, ele poder\u00e1 decifrar 5 minutos.<\/p>\n

Para capturar o tr\u00e1fego criptografado no ar das redes LTE, os pesquisadores usaram um analisador de sinal AirScope<\/a><\/noindex>, e para obter o fluxo de \u00e1udio original durante a chamada do atacante foram usados smartphones Android, controlados via ADB e SCAT<\/a><\/noindex>. O custo do equipamento necess\u00e1rio para realizar o ataque \u00e9 estimado em 7000 d\u00f3lares. <\/p>\n


\n
\r\n \"Por\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

Os fabricantes de esta\u00e7\u00f5es base foram notificados sobre o problema em dezembro do ano passado e a maioria j\u00e1 publicou patches para corrigir a vulnerabilidade. No entanto, alguns operadores podem ter ignorado as atualiza\u00e7\u00f5es. Para verificar a vulnerabilidade das redes LTE e 5G, foi preparado<\/a><\/noindex> um aplicativo m\u00f3vel especial para a plataforma Android 9 (\u00e9 necess\u00e1rio ter acesso root e um smartphone com chips Qualcomm, como Xiaomi Mi A3, One Plus 6T e Xiaomi Mix 3 5G). Al\u00e9m de detectar a vulnerabilidade, o aplicativo tamb\u00e9m pode ser usado para capturar tr\u00e1fego e visualizar mensagens de servi\u00e7o. O tr\u00e1fego capturado \u00e9 salvo no formato PCAP e pode ser enviado a um servidor HTTP especificado pelo usu\u00e1rio para an\u00e1lise posterior com ferramentas padr\u00e3o. <\/p>\n

\"Ataque<\/a><\/noindex><\/center><\/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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\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0433\u043e\u043b\u043e\u0441\u043e\u0432\u043e\u0433\u043e \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044e VoLTE (Voice over LTE). . \u0414\u043b\u044f \u0437\u0430\u0449\u0438\u0442\u044b \u0442\u0435\u043b\u0435\u0444\u043e\u043d\u043d\u044b\u0445 \u0437\u0432\u043e\u043d\u043a\u043e\u0432 \u043e\u0442 \u043f\u0435\u0440\u0435\u0445\u0432\u0430\u0442\u0430 \u0432 VoLTE \u0434\u043b\u044f \u043a\u0430\u043d\u0430\u043b\u0430 \u043c\u0435\u0436\u0434\u0443 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u043c \u0438 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043f\u043e\u0442\u043e\u043a\u043e\u0432\u043e\u0433\u043e \u0448\u0438\u0444\u0440\u0430. \u0421\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":91430,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-91429","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47Ataque ReVoLTE, permitindo a intercepta\u00e7\u00e3o de chamadas criptografadas em LTE | ProHoster","description":"Um grupo de pesquisadores da Universidade de Bochum (Alemanha) apresentou uma t\u00e9cnica de ataque Re\u00adVoL\u00adTE 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