{"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\/pl\/blog\/news\/uyazvimosti-v-drajverah-k-wifi-chipam-broadcom-pozvolyayushhie-udalyonno-atakovat-sistemu","title":{"rendered":"Luki w sterownikach chip\u00f3w WiFi Broadcom umo\u017cliwiaj\u0105 zdalne atakowanie systemu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>W sterownikach do bezprzewodowych chipset\u00f3w Broadcom <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.quarkslab.com\/reverse-engineering-broadcom-wireless-chipsets.html\">ujawniono<\/a><\/noindex> cztery <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kb.cert.org\/vuls\/id\/166939\/\">vulnerablista<\/a><\/noindex>. W najprostszym przypadku luki w zabezpieczeniach mog\u0105 by\u0107 u\u017cywane do zdalnego wywo\u0142ania ataku typu denial-of-service, ale nie wyklucza si\u0119 scenariuszy, w kt\u00f3rych mog\u0105 zosta\u0107 opracowane exploity, pozwalaj\u0105ce nieautoryzowanemu napastnikowi na wykonanie swojego kodu z uprawnieniami j\u0105dra Linux poprzez wys\u0142anie specjalnie przygotowanych pakiet\u00f3w.<\/p>\n<p>Problemy zosta\u0142y zidentyfikowane w wyniku in\u017cynierii wstecznej firmware'\u00f3w Broadcom. Czu\u0142e na luki chipsety s\u0105 szeroko stosowane w laptopach, smartfonach i r\u00f3\u017cnych urz\u0105dzeniach konsumenckich, od SmartTV po urz\u0105dzenia internetowe. W szczeg\u00f3lno\u015bci chipsety Broadcom s\u0105 stosowane w smartfonach takich producent\u00f3w jak Apple, Samsumg i Huawei. Co ciekawe, firma Broadcom zosta\u0142a powiadomiona o lukach we wrze\u015bniu 2018 roku, ale opublikowanie poprawek skoordynowanych z producentami sprz\u0119tu zaj\u0119\u0142o oko\u0142o 7 miesi\u0119cy.<\/p>\n<p>Dwie luki dotycz\u0105 wewn\u0119trznych firmware'\u00f3w i potencjalnie pozwalaj\u0105 na wykonanie kodu w \u015brodowisku systemu operacyjnego u\u017cywanego w chipsetach Broadcom, co umo\u017cliwia atakowanie \u015brodowisk, kt\u00f3re nie korzystaj\u0105 z Linuxa (na przyk\u0142ad potwierdzono mo\u017cliwo\u015b\u0107 przeprowadzenia ataku na urz\u0105dzenia Apple, <noindex><a rel=\"nofollow\" href=\"https:\/\/support.apple.com\/en-us\/HT209600\">CVE-2019-8564<\/a><\/noindex>). Przypomnijmy, \u017ce niekt\u00f3re chipsety Wi-Fi firmy Broadcom s\u0105 wyspecjalizowanym procesorem (ARM Cortex R4 lub M3), w kt\u00f3rym dzia\u0142a co\u015b w rodzaju w\u0142asnego systemu operacyjnego z realizacj\u0105 w\u0142asnego stosu bezprzewodowego 802.11 (FullMAC). W takich chipsetach sterownik zapewnia interakcj\u0119 g\u0142\u00f3wnego systemu z firmware'm chipsetu Wi-Fi. Aby uzyska\u0107 pe\u0142n\u0105 kontrol\u0119 nad g\u0142\u00f3wnym systemem po kompromitacji FullMAC, proponuje si\u0119 u\u017cycie dodatkowych luk lub w niekt\u00f3rych chipsetach skorzystanie z ca\u0142kowitego dost\u0119pu do pami\u0119ci systemowej. W chipsetach SoftMAC stos bezprzewodowy 802.11 jest realizowany po stronie sterownika i wykonywany z wykorzystaniem systemowego CPU.<\/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=\"Luki w sterownikach chip\u00f3w WiFi Broadcom umo\u017cliwiaj\u0105 zdalne atakowanie systemu\" src=\"\/wp-content\/uploads\/2019\/04\/c84d863cd67388f31b82b6f71f3f273c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>W sterownikach, podatno\u015bci wyst\u0119puj\u0105 zar\u00f3wno w proprietary driverze wl (SoftMAC i FullMAC), jak i w otwartym brcmfmac (FullMAC). W sterowniku wl zidentyfikowano dwa przepe\u0142nienia bufora, kt\u00f3re s\u0105 wykorzystywane podczas przesy\u0142ania przez punkt dost\u0119powy specjalnie sformatowanych wiadomo\u015bci EAPOL w procesie negocjacji po\u0142\u0105czenia (atak mo\u017ce by\u0107 przeprowadzony podczas \u0142\u0105czenia si\u0119 z z\u0142o\u015bliwym punktem dost\u0119pu). W przypadku uk\u0142adu z SoftMAC podatno\u015bci prowadz\u0105 do kompromitacji j\u0105dra systemu, a w przypadku FullMAC kod mo\u017ce by\u0107 wykonany po stronie firmware'u. W brcmfmac wyst\u0119puj\u0105 przepe\u0142nienie bufora i b\u0142\u0105d weryfikacji przetwarzanych ramek, wykorzystywane poprzez wysy\u0142anie ramek steruj\u0105cych. Problemy w sterowniku brcmfmac w j\u0105drze Linux. <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=1b5e2423164b3670e8bc9174e4762d297990deff\">by\u0142y<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=a4176ec356c73a46c07c181c6d04039fafa34a9f\">zosta\u0142y usuni\u0119te<\/a><\/noindex> w lutym.<\/p>\n<p>Zidentyfikowane luki:<\/p>\n<ul>\n<li class=\"l\"> CVE-2019-9503 \u2014 nieprawid\u0142owe dzia\u0142anie sterownika brcmfmac podczas przetwarzania ramki kontrolnej u\u017cywanej do interakcji z oprogramowaniem uk\u0142adowym. Je\u015bli rama z zdarzeniem oprogramowania uk\u0142adowego pochodzi z zewn\u0119trznego \u017ar\u00f3d\u0142a, sterownik j\u0105 odrzuca, ale w przypadku gdy zdarzenie jest otrzymywane przez wewn\u0119trzn\u0105 szyn\u0119, rama zostaje przepuszczona. Problem polega na tym, \u017ce przez wewn\u0119trzn\u0105 szyn\u0119 s\u0105 przesy\u0142ane zdarzenia z urz\u0105dze\u0144 wykorzystuj\u0105cych USB, co umo\u017cliwia atakuj\u0105cym skuteczne przesy\u0142anie ramek kontrolnych oprogramowania uk\u0142adowego w przypadku u\u017cycia bezprzewodowych adapter\u00f3w z interfejsem USB;\n<li class=\"l\"> CVE-2019-9500 \u2014 podczas w\u0142\u0105czania funkcji \u201eWake-up on Wireless LAN\u201d mo\u017cna wywo\u0142a\u0107 przepe\u0142nienie stosu w sterowniku brcmfmac (funkcja brcmf_wowl_nd_results) poprzez wys\u0142anie specjalnie zmodyfikowanej ramki kontrolnej. Ta podatno\u015b\u0107 mo\u017ce by\u0107 wykorzystana do uruchomienia kodu w g\u0142\u00f3wnym systemie po skompromitowaniu uk\u0142adu lub w po\u0142\u0105czeniu z podatno\u015bci\u0105 CVE-2019-9503, aby obej\u015b\u0107 kontrole w przypadku zdalnego wysy\u0142ania ramki kontrolnej;\n<li class=\"l\"> CVE-2019-9501 \u2014 przepe\u0142nienie bufora w sterowniku wl (funkcja wlc_wpa_sup_eapol), wyst\u0119puj\u0105ce podczas przetwarzania wiadomo\u015bci, kt\u00f3rych zawarto\u015b\u0107 pola z informacjami o producencie przekracza 32 bajty;\n<li class=\"l\"> CVE-2019-9502 \u2014 przepe\u0142nienie bufora w sterowniku wl (funkcja wlc_wpa_plumb_gtk), wyst\u0119puj\u0105ce podczas przetwarzania wiadomo\u015bci, kt\u00f3rych zawarto\u015b\u0107 pola z informacjami o producencie przekracza 164 bajty.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <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-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All 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