{"id":105214,"date":"2022-09-29T15:36:37","date_gmt":"2022-09-29T13:36:37","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah"},"modified":"2022-09-29T15:36:37","modified_gmt":"2022-09-29T13:36:37","slug":"kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","title":{"rendered":"Vulnerabilit\u00e0 critiche che compromettono la crittografia end-to-end in molti client Matrix","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Gli sviluppatori della piattaforma di comunicazioni decentralizzate Matrix hanno avvisato riguardo a vulnerabilit\u00e0 critiche nelle librerie matrix-js-sdk, matrix-ios-sdk e matrix-android-sdk2, che consentono agli amministratori dei server di impersonare altri utenti e leggere messaggi nelle chat con crittografia end-to-end (E2EE). Le vulnerabilit\u00e0 sono dovute a errori in specifiche implementazioni del protocollo Matrix e non rappresentano problemi del protocollo stesso. Attualmente, il progetto ha rilasciato aggiornamenti per gli SDK problematici e per alcune applicazioni client basate su di essi.    <\/p>\n<p>Per portare a termine con successo un attacco \u00e8 necessaria una connessione al server controllato dall'attaccante <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-shicago\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2922\">server<\/a> (homeserver \u2014 server per la memorizzazione della cronologia e delle registrazioni dei clienti). L'uso della crittografia end-to-end sul lato client non permette all'amministratore <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-los-angeles\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3857\">server<\/a> intercettare le comunicazioni, ma le vulnerabilit\u00e0 scoperte consentono di aggirare questa protezione. I problemi riguardano il principale client Matrix Element (ex Riot) per Web, sistemi desktop, iOS e Android, nonch\u00e9 applicazioni client di terze parti, tra cui Cinny, Beeper, SchildiChat, Circuli e Synod.im. Le vulnerabilit\u00e0 non si manifestano nelle librerie matrix-rust-sdk, hydrogen-sdk, Matrix Dart SDK, mautrix-python, mautrix-go e matrix-nio, n\u00e9 nelle applicazioni Hydrogen, ElementX, Nheko, FluffyChat, Syphon, Timmy, Gomuks e Pantalaimon.      <\/p>\n<p>Si evidenziano tre principali scenari di attacco:  <\/p>\n<ul>\n<li class=\"l\"> Un amministratore del server Matrix pu\u00f2 compromettere la verifica basata su emoji (SAS, Short Authentication Strings) utilizzando firme incrociate e spacciarsi per un altro utente. Il problema \u00e8 causato da una vulnerabilit\u00e0 (CVE-2022-39250) nel codice matrix-js-sdk, relativa alla miscelazione del trattamento degli identificatori dei dispositivi e delle chiavi di firma incrociata.\n<li class=\"l\"> Un aggressore che controlla il funzionamento del server pu\u00f2 falsificare un mittente fidato e trasmettere una chiave falsa per intercettare i messaggi da altri utenti. Il problema \u00e8 causato da una vulnerabilit\u00e0 in matrix-js-sdk (CVE-2022-39251), matrix-ios-sdk (CVE-2022-39255) e matrix-android-sdk2 (CVE-2022-39248), che fa s\u00ec che il client accetti in modo errato i messaggi destinati ai dispositivi, crittografati utilizzando il protocollo Megolm invece di Olm, attribuendo i messaggi al mittente Megolm anzich\u00e9 al mittente effettivo.\n<li class=\"l\"> Utilizzando le vulnerabilit\u00e0 menzionate nel punto precedente, l'amministratore del server pu\u00f2 anche aggiungere una chiave di backup falsa all'account utente per estrarre le chiavi utilizzate per crittografare i messaggi.    <\/ul>\n<p>I ricercatori che hanno identificato la vulnerabilit\u00e0 hanno anche dimostrato attacchi che portano all'aggiunta di un utente esterno a una chat o al collegamento di un dispositivo di terzi a un utente. Questi attacchi si basano sul fatto che i messaggi di servizio, utilizzati per aggiungere utenti alla chat, non sono legati alle chiavi del creatore della chat e possono essere generati dall'amministratore del server. Gli sviluppatori del progetto Matrix hanno classificato queste vulnerabilit\u00e0 come di poco conto, poich\u00e9 tali manovre non passeranno inosservate \u2014 in caso di sostituzione dell'utente, esso apparir\u00e0 nell'elenco degli utenti della chat, e in caso di aggiunta del dispositivo verr\u00e0 visualizzato un avviso e il dispositivo sar\u00e0 contrassegnato come non verificato (immediatamente dopo l'aggiunta del dispositivo sostitutivo, inizieranno a essere trasmessi le chiavi condivise necessarie per decriptare i messaggi).<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57844\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&hellip;]<\/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<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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compromettano la crittografia end-to-end in molti client Matrix | ProHoster","description":"Gli sviluppatori della piattaforma di comunicazioni decentralizzate Matrix hanno avvertito di aver scoperto vulnerabilit\u00e0 critiche nelle librerie matrix-js-sdk, matrix-ios-sdk e matrix-android-sdk2, che consentono agli amministratori dei server di sfruttarle.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/news\/kriticheskie-uyazvimosti-komprometiruyushhie-skvoznoe-shifrovanie-vo-mnogih-matrix-klientah","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS 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