{"id":117239,"date":"2024-07-10T15:43:03","date_gmt":"2024-07-10T13:43:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-protokole-radius-pozvolyayushhaya-poddelat-otvet-pri-autentifikaczii"},"modified":"2024-07-10T15:43:03","modified_gmt":"2024-07-10T13:43:04","slug":"uyazvimost-v-protokole-radius-pozvolyayushhaya-poddelat-otvet-pri-autentifikaczii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-protokole-radius-pozvolyayushhaya-poddelat-otvet-pri-autentifikaczii","title":{"rendered":"Vulnerabilit\u00e0 nel protocollo RADIUS che consente di falsificare una risposta durante l'autenticazione","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Un gruppo di ricercatori di diverse universit\u00e0 americane e delle aziende Cloudflare e Microsoft ha sviluppato una nuova tecnica di attacco al protocollo RADIUS, utilizzato da operatori di telecomunicazioni, servizi cloud e provider VPN per l'autenticazione, l'autorizzazione e la contabilizzazione degli utenti. L'attacco, soprannominato Blast-RADIUS, consente di falsificare la risposta del server RADIUS durante il processo di autenticazione e di stabilire una connessione per l'utente senza conoscere la password di accesso.     <\/p>\n<p>Per sfruttare la vulnerabilit\u00e0 (CVE-2024-3596), un attaccante deve essere in grado di intercettare il traffico in transito e condurre un attacco MITM completo, che consenta di leggere, catturare, bloccare e modificare i pacchetti UDP in transito in ingresso e in uscita, inviati dai punti di accesso per richiedere l'autenticazione dei clienti (Access-Request) e restituiti dal server RADIUS con conferma o rifiuto dell'operazione. Catturando la richiesta di autenticazione, l'attaccante pu\u00f2 inviare una risposta fasulla, specificando in questa risposta un tipo di risultato diverso (ad esempio, Access-Accept invece di Access-Reject). L'attaccante potrebbe anche intercettare potenzialmente la risposta Access-Challenge, utilizzata nella autenticazione a due fattori, e sostituirla con una risposta Access-Accept per bypassare la fase di verifica aggiuntiva.    <center><img decoding=\"async\" alt=\"Vulnerabilit\u00e0 nel protocollo RADIUS che consente di falsificare una risposta durante l&#039;autenticazione\" src=\"\/wp-content\/uploads\/2024\/07\/387db9c9f51c3eebe36f97bf178eb451.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>L'attacco si basa sul fatto che il protocollo RADIUS utilizza UDP come trasporto e verifica l'integrit\u00e0 dei messaggi trasmessi attraverso l'algoritmo MD5. Per verificare i messaggi trasmessi tra <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-prohoster\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3085\">server<\/a> Per l'accesso e il server RADIUS, viene utilizzata una chiave segreta, conosciuta sia dal punto di accesso che dal server RADIUS, ma non dall'attaccante. In risposta alla richiesta di autenticazione, il server RADIUS genera un hash MD5, con il quale il server di accesso pu\u00f2 verificare che il messaggio sia stato inviato da un server autorizzato. L'hash MD5 copre il valore casuale inviato nella richiesta, l'identificatore della richiesta, gli attributi restituiti e la chiave segreta.    <\/p>\n<p>L'attaccante durante un attacco MITM pu\u00f2 intercettare l'identificativo e il valore casuale trasmessi nella richiesta, oltre a poter prevedere il codice operazione, la dimensione e gli attributi. La sfida consiste nel formare un hash di verifica corretto che corrisponda al risultato operativo modificato e superi il controllo tramite hashing con l'uso di una chiave segreta. L'algoritmo MD5 non \u00e8 resistente agli attacchi di collisione, permettendo all'attaccante, manipolando il riempimento aggiuntivo irrilevante, di trovare una combinazione di dati con i parametri desiderati, il cui hash MD5 corrisponder\u00e0 a quello della risposta originale, e inviare una risposta falsa con codice di successo dell'autenticazione (Access-Accept) al posto del messaggio di errore.     <center><img decoding=\"async\" alt=\"Vulnerabilit\u00e0 nel protocollo RADIUS che consente di falsificare una risposta durante l&#039;autenticazione\" src=\"\/wp-content\/uploads\/2024\/07\/271cb7d8b85b87ba3517ba6baac6e790.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Poich\u00e9 nella gestione dei pacchetti con richiesta di accesso (Access-Request) non viene applicata l'autenticazione e il controllo di integrit\u00e0, durante l'attacco, la richiesta originale viene modificata. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-los-angeles\/\"   title=\"\u0441\u0435\u0440\u0432\u0435\u0440\u0430\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3927\">\u0441\u0435\u0440\u0432\u0435\u0440\u0430<\/a> Un attaccante pu\u00f2 inserire un ulteriore attributo &#171;Proxy-State&#187;, che sar\u00e0 riportato dal server RADIUS nella sua risposta. Il contenuto del &#171;Proxy-State&#187; \u00e8 scelto tenendo conto della collisione, in modo che il valore dell'hash MD5 di controllo nelle risposte reali e false sia identico. Durante un esperimento, la ricerca della collisione in MD5 per effettuare l'attacco ha richiesto 3-6 minuti, che \u00e8 pi\u00f9 lungo del timeout tipico di 30-60 secondi, ma il tempo di ricerca della collisione pu\u00f2 essere ridotto utilizzando hardware pi\u00f9 potente, coinvolgendo GPU e parallelizzando le operazioni.                       <\/p>\n<p>Come misura principale per proteggere contro questa vulnerabilit\u00e0, si propone di utilizzare il protocollo EAP (Extensible Authentication Protocol, RFC 3579), nel quale per una verifica aggiuntiva dei messaggi viene utilizzato l'attributo Message-Authenticator. Per difendersi dall'attacco, \u00e8 possibile anche usare le estensioni del protocollo (RadSec), che includono la trasmissione di messaggi RADIUS attraverso canali crittografati basati su TLS o DTLS. Inoltre, \u00e8 possibile ridurre al minimo i valori di timeout per la ricezione delle risposte e bloccare le risposte con l'attributo Proxy-State. La trasmissione di messaggi RADIUS su TCP complica l'attacco, ma non lo esclude.     <\/p>\n<p>Il codice per eseguire l'attacco non \u00e8 ancora pubblicato, ma il progetto hashclash ha ricevuto aggiornamenti che migliorano la ricerca di collisioni in MD5 considerando le specificit\u00e0 dell'attacco. Nel server RADIUS FreeRADIUS, il problema \u00e8 stato risolto nelle versioni 3.0.27 e 3.2.5 attivando l'applicazione obbligatoria dell'attributo Message-Authenticator e aggiungendo un'impostazione per limitare l'elaborazione dei pacchetti con l'attributo Proxy-State.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61517\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0430\u043c\u0435\u0440\u0438\u043a\u0430\u043d\u0441\u043a\u0438\u0445 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u043e\u0432 \u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Cloudflare \u0438 Microsoft \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0430 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b RADIUS, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0439 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0430\u043c\u0438 \u0441\u0432\u044f\u0437\u0438, \u043e\u0431\u043b\u0430\u0447\u043d\u044b\u043c\u0438 \u0441\u0435\u0440\u0432\u0438\u0441\u0430\u043c\u0438 \u0438 VPN-\u043f\u0440\u043e\u0432\u0430\u0439\u0434\u0435\u0440\u0430\u043c\u0438 \u0434\u043b\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u0430\u0432\u0442\u043e\u0440\u0438\u0437\u0430\u0446\u0438\u0438 \u0438 \u0430\u043a\u043a\u0430\u0443\u043d\u0442\u0438\u043d\u0433\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439. \u0410\u0442\u0430\u043a\u0430, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Blast-RADIUS, \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043f\u043e\u0434\u0434\u0435\u043b\u0430\u0442\u044c \u043e\u0442\u0432\u0435\u0442 RADIUS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u043f\u0440\u0438 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0438 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0438 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u0430\u0431\u043e\u043d\u0435\u043d\u0442\u0430 \u0431\u0435\u0437 \u0437\u043d\u0430\u043d\u0438\u044f \u043f\u0430\u0440\u043e\u043b\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430. \u0414\u043b\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":117240,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-117239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0430\u043c\u0435\u0440\u0438\u043a\u0430\u043d\u0441\u043a\u0438\u0445 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u043e\u0432 \u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Cloudflare \u0438 Microsoft 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delle aziende Cloudflare e Microsoft ha sviluppato una nuova tecnica di attacco al protocollo RADIUS, utilizzato dagli operatori di telecomunicazioni, dai servizi cloud e dai fornitori VPN per l'autenticazione, l'autorizzazione e il caricamento dei dati degli utenti. L'attacco, noto con il nome in codice Blast-RADIUS, consente di falsificare la risposta del server RADIUS durante l'autenticazione e di connettere un abbonato senza conoscere la password di accesso. Per sfruttare","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-protokole-radius-pozvolyayushhaya-poddelat-otvet-pri-autentifikaczii","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 \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 RADIUS, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u0434\u0435\u043b\u0430\u0442\u044c \u043e\u0442\u0432\u0435\u0442 \u043f\u0440\u0438 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