{"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\/et\/blog\/novosti-interneta\/uyazvimosti-v-drajverah-k-wifi-chipam-broadcom-pozvolyayushhie-udalyonno-atakovat-sistemu","title":{"rendered":"Broadcomi WiFi-kiipide draiverite haavatavused, mis v\u00f5imaldavad s\u00fcsteemi kaugr\u00fcnnakuid.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Broadcomi traadita kiipide draiverites <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.quarkslab.com\/reverse-engineering-broadcom-wireless-chipsets.html\">tuvastatud<\/a><\/noindex> neli <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kb.cert.org\/vuls\/id\/166939\/\">haavatavusest<\/a><\/noindex>. Lihtsaimatel juhtudel v\u00f5ivad haavatavusi kasutada kaugl\u00fckkamiseks, kuid ei v\u00e4listata ka stsenaariume, kus v\u00f5idakse arendada eksploite, mis v\u00f5imaldavad autentimata r\u00fcndajal k\u00e4ivitada oma koodi Linuxi tuumaga seotud \u00f5igustes, saates spetsiaalselt kujundatud pakette.<\/p>\n<p>Probleemid avastati Broadcomi jaoks m\u00f5eldud p\u00fcsivara tagasip\u00f6\u00f6ramise k\u00e4igus. Haavatavustele vastuv\u00f5tlikud kiibid on laialdaselt kasutatud s\u00fclearvutites, nutitelefonides ja erinevates tarbija seadmetes alates SmartTV-dest kuni asjade interneti seadmeteni. Eriti kasutatakse Broadcomi kiipe nutitelefonides tootjatelt nagu Apple, Samsung ja Huawei. K\u00f5nev\u00e4\u00e4rne on, et Broadcomile tehti haavatavustest teatavaks juba 2018. aasta septembris, kuid seadmete tootjate koordineeritud paranduste v\u00e4ljaandmiseks kulus umbes 7 kuud.<\/p>\n<p>Kaks haavatavust m\u00f5jutavad sisemist tarkvara ja v\u00f5ivad potentsiaalselt v\u00f5imaldada koodi t\u00e4itmist Broadcomi kiipides kasutatavas operatsioonis\u00fcsteemis, mille tagaj\u00e4rjel saavad r\u00fcnnatud olla ka s\u00fcsteemid, mis ei kasuta Linuxi (n\u00e4iteks on kinnitatud, et r\u00fcnnakud Apple'i seadmetele on v\u00f5imalikud, <noindex><a rel=\"nofollow\" href=\"https:\/\/support.apple.com\/en-us\/HT209600\">CVE-2019-8564<\/a><\/noindex>). Tuletame meelde, et m\u00f5ned Broadcomi Wi-Fi kiibid on spetsialiseeritud protsessorid (ARM Cortex R4 v\u00f5i M3), millel t\u00f6\u00f6tab nende oma operatsioonis\u00fcsteemi analoog koos 802.11 (FullMAC) juhtimise raamistiku rakendustega. Sellistes kiipides tagab juhtpaneel p\u00f5hiss\u00fcsteemi ja Wi-Fi kiibi tarkvara vahelise suhtluse. P\u00e4rast FullMAC-i kompromiteerimist saavad r\u00fcndajad kogu kontrolli p\u00f5hiss\u00fcsteemi \u00fcle, kasutades t\u00e4iendavaid haavatavusi v\u00f5i m\u00f5nedel kiipidel t\u00e4ielikku juurdep\u00e4\u00e4su s\u00fcsteemi m\u00e4lule. SoftMAC-iga kiipides on 802.11 juhtimisraamistik rakendatud draiveri tasemel ja seda t\u00f6\u00f6tab s\u00fcsteemi 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=\"Broadcomi WiFi-kiipide draiverite haavatavused, mis v\u00f5imaldavad s\u00fcsteemi kaugr\u00fcnnakuid.\" src=\"\/wp-content\/uploads\/2019\/04\/c84d863cd67388f31b82b6f71f3f273c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Juhendites esinevad haavatavused nii patenteeritud juhendis wl (SoftMAC ja FullMAC) kui ka avatud juhendis brcmfmac (FullMAC). Juhendis wl tuvastati kaks puhver\u00fclevoolu, mida saab \u00e4ra kasutada juurdep\u00e4\u00e4supunkti kaudu spetsiaalsete EAPOL-s\u00f5numite saatmisel \u00fchenduse loomise k\u00e4igus (r\u00fcnnak v\u00f5ib toimuda pahatahtlikule juurdep\u00e4\u00e4supunktile \u00fchendudes). SoftMAC kiibi puhul viivad haavatavused s\u00fcsteemi kerneli kompromiteerimiseni, samas kui FullMAC puhul v\u00f5ib koodi k\u00e4ivitada p\u00fcsivara k\u00fcljel. Juhendis brcmfmac esinevad puhver\u00fclevool ja kaadrite t\u00f6\u00f6tlemise kontrollimise viga, mida saab \u00e4ra kasutada juhtivate kaadrite saatmise kaudu. Linuxi k\u00e4rgs tekivad probleemid juhendis brcmfmac. <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=1b5e2423164b3670e8bc9174e4762d297990deff\">oli<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=a4176ec356c73a46c07c181c6d04039fafa34a9f\">likvideeritud<\/a><\/noindex> veebruaris.<\/p>\n<p>Tuvastatud haavatavused:<\/p>\n<ul>\n<li class=\"l\"> CVE-2019-9503 \u2014 driver brcmfmac'i valevus k\u00e4itumine esialgsete kaadrite t\u00f6\u00f6tlemisel, mis on m\u00f5eldud suhtlemiseks p\u00fcsivara. Kui p\u00fcsivara s\u00fcndmuse kaader p\u00e4rineb v\u00e4listest allikatest, loob driver selle, kuid juhul, kui s\u00fcndmus saadakse siseveebibussilt, kaader j\u00f5uab l\u00e4bi. Probleem on selles, et sisetingimustes edastatakse s\u00fcndmusi seadmetelt, mis kasutavad USB-d, mis v\u00f5imaldab r\u00fcndajatel edukalt edastada p\u00fcsivara juhtimise kaadreid juhul, kui kasutatav on traadita adapter USB liidese kaudu;\n<li class=\"l\"> CVE-2019-9500 \u2014 funktsiooni \u201eWake-up on Wireless LAN\u201d sissel\u00fclitamisel v\u00f5ib brcmfmac'i draiveris (funktsioon brcmf_wowl_nd_results) p\u00f5hjustada virna \u00fclevoolu, saates spetsiaalselt muudetud juhtimiskaadri. Seda haavatavust saab kasutada koodi t\u00e4itmiseks p\u00f5hiseadmest, p\u00e4rast kiibi kompromiteerimist v\u00f5i koos haavatavusega CVE-2019-9503, et pettuse kontrollide t\u00f5ttu kaugete juhtimiskaadrite saatmisel;\n<li class=\"l\"> CVE-2019-9501 \u2014 puhangu \u00fclevool draiveris wl (funktsioon wlc_wpa_sup_eapol), mis tekib, t\u00f6\u00f6tledes s\u00f5numeid, mille tootjainformatsiooni v\u00e4li \u00fcletab 32 baiti;\n<li class=\"l\"> CVE-2019-9502 \u2014 puhangu \u00fclevool draiveris wl (funktsioon wlc_wpa_plumb_gtk), mis tekib s\u00f5numite t\u00f6\u00f6tlemisel, mille tootjainformatsiooni v\u00e4li \u00fcletab 164 baiti.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <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 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