{"id":31914,"date":"2019-10-31T21:43:56","date_gmt":"2019-10-31T18:43:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimosti-v-drajverah-k-wifi-chipam-broadcom-pozvolyayushhie-udalyonno-atakovat-sistemu\/"},"modified":"2019-10-31T21:43:56","modified_gmt":"2019-10-31T18:43:56","slug":"uyazvimosti-v-drajverah-k-wifi-chipam-broadcom-pozvolyayushhie-udalyonno-atakovat-sistemu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-v-drajverah-k-wifi-chipam-broadcom-pozvolyayushhie-udalyonno-atakovat-sistemu","title":{"rendered":"Vulnerabilit\u00e0 nei driver dei chip WiFi Broadcom che consentono attacchi remoti al sistema","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nei driver per chip wireless Broadcom <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.quarkslab.com\/reverse-engineering-broadcom-wireless-chipsets.html\">identificato<\/a><\/noindex> quattro <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kb.cert.org\/vuls\/id\/166939\/\">vulnerabilit\u00e0<\/a><\/noindex>. Nel caso pi\u00f9 semplice, le vulnerabilit\u00e0 possono essere sfruttate per provocare un'interruzione del servizio remoto, ma non si escludono scenari in cui potrebbero essere sviluppati exploit che consentono a un attaccante non autenticato di eseguire il proprio codice con privilegi di kernel Linux attraverso l'invio di pacchetti formattati in modo specifico.<\/p>\n<p>I problemi sono stati identificati attraverso il reverse engineering dei firmware Broadcom. I chip vulnerabili sono ampiamente utilizzati in laptop, smartphone e vari dispositivi di consumo, da SmartTV a dispositivi Internet of Things. In particolare, i chip Broadcom sono utilizzati in smartphone di produttori come Apple, Samsung e Huawei. \u00c8 interessante notare che Broadcom \u00e8 stata informata delle vulnerabilit\u00e0 gi\u00e0 nel settembre 2018, ma sono stati necessari circa 7 mesi per il rilascio degli aggiornamenti coordinato con i produttori di hardware.<\/p>\n<p>Due vulnerabilit\u00e0 interessano i firmware interni e consentono potenzialmente di eseguire codice nell'ambiente del sistema operativo utilizzato nei chip Broadcom, permettendo di attaccare ambienti che non utilizzano Linux (\u00e8 confermato che \u00e8 possibile attaccare dispositivi Apple, <noindex><a rel=\"nofollow\" href=\"https:\/\/support.apple.com\/en-us\/HT209600\">CVE-2019-8564<\/a><\/noindex>). Ricordiamo che alcuni chip Wi-Fi Broadcom sono processori specializzati (ARM Cortex R4 o M3) che eseguono una sorta di sistema operativo con implementazioni del proprio stack wireless 802.11 (FullMAC). In tali chip, il driver facilita l'interazione tra il sistema principale e il firmware del chip Wi-Fi. Per ottenere il pieno controllo del sistema principale dopo un compromesso del FullMAC, si suggerisce di utilizzare ulteriori vulnerabilit\u00e0 o, in alcuni chip, di approfittare dell'accesso completo alla memoria di sistema. Negli chip con SoftMAC, lo stack wireless 802.11 \u00e8 implementato dal lato del driver e viene eseguito utilizzando il CPU di sistema.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog.quarkslab.com\/resources\/2019-04-16_reversing-broadcom-wifi-chipsets\/bcm_global_stack.png\"><img decoding=\"async\" alt=\"Vulnerabilit\u00e0 nei driver dei chip WiFi Broadcom che consentono attacchi remoti al sistema\" src=\"\/wp-content\/uploads\/2019\/04\/c84d863cd67388f31b82b6f71f3f273c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Le vulnerabilit\u00e0 nei driver si manifestano sia nel driver proprietario wl (SoftMAC e FullMAC) che nel driver open source brcmfmac (FullMAC). Nel driver wl sono stati individuati due overflow di buffer, sfruttabili durante la trasmissione da parte del punto di accesso di messaggi EAPOL appositamente formattati durante il processo di negoziazione della connessione (l'attacco pu\u00f2 essere effettuato collegandosi a un punto di accesso malevolo). Nel caso di un chip con SoftMAC, le vulnerabilit\u00e0 portano al compromesso del kernel di sistema, mentre nel caso di FullMAC il codice pu\u00f2 essere eseguito sul lato firmware. Nel brcmfmac sono presenti un overflow di buffer e un errore di verifica dei frame elaborati, sfruttabili tramite l'invio di frame di controllo. Nel kernel Linux si riscontrano problemi nel driver brcmfmac. <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=1b5e2423164b3670e8bc9174e4762d297990deff\">erano<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=a4176ec356c73a46c07c181c6d04039fafa34a9f\">risolte<\/a><\/noindex> a febbraio.<\/p>\n<p>Vulnerabilit\u00e0 identificate:<\/p>\n<ul>\n<li class=\"l\"> CVE-2019-9503 \u2014 comportamento errato del driver brcmfmac nella gestione dei pacchetti di controllo utilizzati per interagire con il firmware. Se un pacchetto di evento del firmware proviene da una fonte esterna, il driver lo scarta; ma se l'evento \u00e8 ricevuto tramite il bus interno, il pacchetto viene ignorato. Il problema \u00e8 che tramite il bus interno vengono trasmessi eventi da dispositivi che utilizzano USB, il che consente agli attaccanti di trasmettere con successo pacchetti di controllo del firmware quando si utilizzano adattatori wireless con interfaccia USB;\n<li class=\"l\"> CVE-2019-9500 \u2014 abilitando la funzione \u00abWake-up on Wireless LAN\u00bb \u00e8 possibile provocare un overflow di heap nel driver brcmfmac (funzione brcmf_wowl_nd_results) inviando un pacchetto di controllo appositamente modificato. Questa vulnerabilit\u00e0 pu\u00f2 essere sfruttata per eseguire codice nel sistema host dopo il compromesso del chip o in combinazione con la vulnerabilit\u00e0 CVE-2019-9503 per eludere i controlli in caso di invio remoto del pacchetto di controllo;\n<li class=\"l\"> CVE-2019-9501 \u2014 overflow del buffer nel driver wl (funzione wlc_wpa_sup_eapol), che si verifica durante l'elaborazione dei messaggi, il cui campo di informazioni del produttore supera i 32 byte;\n<li class=\"l\"> CVE-2019-9502 \u2014 overflow del buffer nel driver wl (funzione wlc_wpa_plumb_gtk), che si verifica durante l'elaborazione dei messaggi, il cui campo di informazioni del produttore supera i 164 byte.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50539\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0430\u0445 \u0434\u043b\u044f \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u0447\u0438\u043f\u043e\u0432 Broadcom \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e \u0447\u0435\u0442\u044b\u0440\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438. \u0412 \u043f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0433\u0443\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u0437\u043e\u0432\u0430 \u043e\u0442\u043a\u0430\u0437\u0430 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438, \u043d\u043e \u043d\u0435 \u0438\u0441\u043a\u043b\u044e\u0447\u0430\u044e\u0442\u0441\u044f \u0438 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0438, \u043f\u0440\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u044b, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043d\u0435\u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u0441 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u044f\u043c\u0438 \u044f\u0434\u0440\u0430 Linux \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0431\u044b\u043b\u0438 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0432 \u0445\u043e\u0434\u0435 \u043e\u0431\u0440\u0430\u0442\u043d\u043e\u0433\u043e \u0438\u043d\u0436\u0438\u043d\u0438\u0440\u0438\u043d\u0433\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":23774,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-31914","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=\"\u0412 \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0430\u0445 \u0434\u043b\u044f \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u0447\u0438\u043f\u043e\u0432 Broadcom \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e \u0447\u0435\u0442\u044b\u0440\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438. \u0412 \u043f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 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per chip WiFi Broadcom, che consentono attacchi remoti al sistema | ProHoster","description":"Sono state identificate quattro vulnerabilit\u00e0 nei driver per i chip wireless Broadcom. Nella sua forma pi\u00f9 semplice, queste vulnerabilit\u00e0 possono essere sfruttate per un attacco di denial-of-service remoto, ma non si possono escludere scenari in cui possono essere sviluppati exploit che consentono a un aggressore non autenticato di eseguire codice con privilegi di kernel Linux inviando pacchetti appositamente formattati. 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