{"id":104866,"date":"2022-08-17T09:36:49","date_gmt":"2022-08-17T07:36:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ustrojstvah-na-baze-soc-realtek-pozvolyayushhaya-vypolnit-kod-cherez-otpravku-udp-paketa"},"modified":"2022-08-17T09:36:49","modified_gmt":"2022-08-17T07:36:49","slug":"uyazvimost-v-ustrojstvah-na-baze-soc-realtek-pozvolyayushhaya-vypolnit-kod-cherez-otpravku-udp-paketa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimost-v-ustrojstvah-na-baze-soc-realtek-pozvolyayushhaya-vypolnit-kod-cherez-otpravku-udp-paketa","title":{"rendered":"Vulnerabilit\u00e0 nei dispositivi basati su SoC Realtek, che consente l'esecuzione di codice tramite l'invio di pacchetti UDP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I ricercatori di Faraday Security hanno presentato alla conferenza DEFCON i dettagli su una vulnerabilit\u00e0 critica (CVE-2022-27255) nel SDK per i chip Realtek RTL819x, che consente di eseguire il proprio codice sul dispositivo tramite l'invio di un pacchetto UDP appositamente formattato. La vulnerabilit\u00e0 \u00e8 notevole perch\u00e9 permette di attaccare dispositivi in cui l'accesso all'interfaccia web per le reti esterne \u00e8 disabilitato: \u00e8 sufficiente inviare un solo pacchetto UDP.    <\/p>\n<p>La vulnerabilit\u00e0 colpisce i dispositivi che utilizzano versioni vulnerabili del SDK Realtek, tra cui eCos RSDK 1.5.7p1 e MSDK 4.9.4p1. Gli aggiornamenti per l'SDK eCos che risolvono la vulnerabilit\u00e0 sono stati pubblicati da Realtek il 25 marzo. Non \u00e8 ancora chiaro quali dispositivi siano effettivamente vulnerabili: il SoC Realtek RTL819x \u00e8 utilizzato in router di rete, punti di accesso, amplificatori Wi-Fi, telecamere IP, dispositivi IoT e in altri dispositivi di rete di oltre 60 produttori, tra cui Asus, A-Link, Beeline, Belkin, Buffalo, D-Link, Edison, Huawei, LG, Logitec, MT-Link, Netgear, Smartlink, UPVEL, ZTE e Zyxel.     <\/p>\n<p>Sono gi\u00e0 disponibili pubblicamente esempi di exploit per ottenere accesso remoto ai dispositivi ed eseguire comandi, a partire da un attacco a un router Nexxt Nebula 300 Plus. Sono state inoltre rilasciate utilit\u00e0 per analizzare i firmware alla ricerca di vulnerabilit\u00e0.     <\/p>\n<p>Considerando i problemi con la preparazione e la distribuzione degli aggiornamenti firmware per i dispositivi gi\u00e0 rilasciati, si prevede l'emergere a breve di attacchi automatizzati e worm che colpiranno dispositivi di rete vulnerabili. Dopo un attacco riuscito, i dispositivi compromessi potrebbero essere utilizzati da malintenzionati, ad esempio, per formare botnet, creare backdoor per lasciare un varco nella rete interna dell'azienda, o per intercettare il traffico di transito o reindirizzarlo verso un host esterno.    <\/p>\n<p>La vulnerabilit\u00e0 \u00e8 causata da un overflow del buffer nel modulo \"SIP ALG\" (SIP Application Layer Gateway), utilizzato per organizzare il forwarding dei pacchetti SIP attraverso un traduttore di indirizzi. Il problema \u00e8 sorto a causa della mancanza di controllo sulla dimensione reale dei dati ricevuti, portando a una sovrascrittura della memoria oltre il buffer fisso durante la chiamata della funzione strcpy durante l'elaborazione dei pacchetti SIP. L'attacco pu\u00f2 essere effettuato inviando un pacchetto UDP con valori errati nei campi del blocco dati SDP o nell'intestazione del protocollo SIP. \u00c8 sufficiente inviare un singolo pacchetto a una porta UDP arbitraria dell'interfaccia WAN.      <center>  <video controls=\"\" style=\"width: 700px; height: 400px; max-width:100%\"><source src=\"https:\/\/github.com\/infobyte\/cve-2022-27255\/raw\/main\/DEFCON\/poc.mp4\" type=\"video\/mp4\"><\/video>  <\/center>    <\/p>\n<p>Come misura di protezione, si raccomanda di bloccare nel firewall o nel sistema di prevenzione delle intrusioni i pacchetti UDP contenenti il messaggio SIP \"INVITE\", la stringa \"m=audio\" e una dimensione superiore a 128 byte. Esempio di regola per rilevare tentativi di sfruttamento in IDS Snort 3: alert udp any any -&gt; any any (sid:1000000; msg:\"Sfruttamento del traffico SIP SDK Realtek eCOS CVE-2022-27255\"; content:\"invite\"; depth:6; nocase; content:\"m=audio \"; isdataat:128,relative; content:!\"|0d|\"; within:128;)<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57645\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Faraday Security \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 DEFCON \u0434\u0435\u0442\u0430\u043b\u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2022-27255) \u0432 SDK \u0434\u043b\u044f \u0447\u0438\u043f\u043e\u0432 Realtek RTL819x, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0435 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e UDP-\u043f\u0430\u043a\u0435\u0442\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0430\u0442\u0430\u043a\u043e\u0432\u0430\u0442\u044c \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043e\u0442\u043a\u043b\u044e\u0447\u0451\u043d \u0434\u043e\u0441\u0442\u0443\u043f \u0432 web-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 \u0434\u043b\u044f \u0432\u043d\u0435\u0448\u043d\u0438\u0445 \u0441\u0435\u0442\u0435\u0439 &#8212; \u0434\u043b\u044f \u0430\u0442\u0430\u043a\u0438 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043f\u0440\u043e\u0441\u0442\u043e \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u043e\u0434\u0438\u043d UDP-\u043f\u0430\u043a\u0435\u0442. [&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-104866","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Faraday Security \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 DEFCON \u0434\u0435\u0442\u0430\u043b\u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 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DEFCON i dettagli dell'exploitation di una vulnerabilit\u00e0 critica (CVE-2022-27255) nel SDK per i chip Realtek RTL819x, che consente di eseguire codice sul dispositivo.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimost-v-ustrojstvah-na-baze-soc-realtek-pozvolyayushhaya-vypolnit-kod-cherez-otpravku-udp-paketa","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 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445 \u043d\u0430 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