{"id":37225,"date":"2019-10-31T22:16:26","date_gmt":"2019-10-31T19:16:26","guid":{"rendered":"https:\/\/prohoster.info\/blog\/ataka-knob-pozvolyayushhaya-perehvatit-zashifrovannyj-trafik-bluetooth\/"},"modified":"2019-10-31T22:16:26","modified_gmt":"2019-10-31T19:16:26","slug":"ataka-knob-pozvolyayushhaya-perehvatit-zashifrovannyj-trafik-bluetooth","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/ataka-knob-pozvolyayushhaya-perehvatit-zashifrovannyj-trafik-bluetooth","title":{"rendered":"\u00datok KNOB, kter\u00fd umo\u017e\u0148uje zachytit za\u0161ifrovan\u00fd Bluetooth provoz","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Odhalen\u00e9<\/a><\/noindex> informace<\/a><\/noindex> o \u00fatoku KNOB<\/a><\/noindex> (Key Negotiation Of Bluetooth), kter\u00fd umo\u017e\u0148uje zachytit a manipulovat s informacemi v za\u0161ifrovan\u00e9m bluetooth provozu. T\u00edm, \u017ee \u00fato\u010dn\u00edk dok\u00e1\u017ee blokovat p\u0159\u00edm\u00fd p\u0159enos paket\u016f b\u011bhem procesu vyjedn\u00e1v\u00e1n\u00ed spojen\u00ed Bluetooth za\u0159\u00edzen\u00ed, m\u016f\u017ee dos\u00e1hnout pou\u017eit\u00ed kl\u00ed\u010d\u016f pro sezen\u00ed, kter\u00e9 obsahuj\u00ed pouze 1 byte entropie, co\u017e umo\u017e\u0148uje pou\u017e\u00edt metodu hrub\u00e9ho \u00fatoku (brute-force) k ur\u010den\u00ed \u0161ifrovac\u00edho kl\u00ed\u010de. <\/p>\n

Probl\u00e9m je zp\u016fsoben nedostatky (CVE-2019-9506) ve specifikaci Bluetooth BR\/EDR Core 5.1 a star\u0161\u00edch verz\u00ed, kter\u00e9 umo\u017e\u0148uj\u00ed pou\u017eit\u00ed p\u0159\u00edli\u0161 kr\u00e1tk\u00fdch \u0161ifrovac\u00edch kl\u00ed\u010d\u016f a nebr\u00e1n\u00ed z\u00e1sahu \u00fato\u010dn\u00edka v f\u00e1zi vyjedn\u00e1v\u00e1n\u00ed spojen\u00ed k n\u00e1vratu k takov\u00fdm nespolehliv\u00fdm kl\u00ed\u010d\u016fm (je mo\u017en\u00e9 vlo\u017een\u00ed paket\u016f neautentizovan\u00fdm \u00fato\u010dn\u00edkem). \u00datok m\u016f\u017ee b\u00fdt proveden b\u011bhem vyjedn\u00e1v\u00e1n\u00ed spojen\u00ed za\u0159\u00edzen\u00ed (ji\u017e zaveden\u00e1 sezen\u00ed nelze napadnout) a je \u00fa\u010dinn\u00fd pouze pro spojen\u00ed v re\u017eimech BR\/EDR (Bluetooth Basic Rate\/Enhanced Data Rate), pokud jsou ob\u011b za\u0159\u00edzen\u00ed n\u00e1chyln\u00e1 k zranitelnosti. V p\u0159\u00edpad\u011b \u00fasp\u011b\u0161n\u00e9ho uhodnut\u00ed kl\u00ed\u010de m\u016f\u017ee \u00fato\u010dn\u00edk de\u0161ifrovat p\u0159en\u00e1\u0161en\u00e1 data a nen\u00e1padn\u011b manipulovat s provozem jak\u00fdmkoli za\u0161ifrovan\u00fdm textem.<\/p>\n

P\u0159i navazov\u00e1n\u00ed spojen\u00ed mezi dv\u011bma Bluetooth kontrol\u00e9ry A a B m\u016f\u017ee kontrol\u00e9r A po autentizaci pomoc\u00ed kan\u00e1lov\u00e9ho kl\u00ed\u010de (link key) navrhnout pou\u017e\u00edt jako \u0161ifrovac\u00ed kl\u00ed\u010d (encryption key) 16 byte entropie, a kontrol\u00e9r B se m\u016f\u017ee s t\u00edmto hodnotou souhlasit nebo navrhnout ni\u017e\u0161\u00ed hodnotu, pokud nen\u00ed schopen vytvo\u0159it kl\u00ed\u010d navrhovan\u00e9 velikosti. V odpov\u011bdi m\u016f\u017ee kontrol\u00e9r A p\u0159ijmout odpov\u011bdn\u00ed n\u00e1vrh a aktivovat \u0161ifrovan\u00fd komunika\u010dn\u00ed kan\u00e1l. V t\u00e9to f\u00e1zi vyjedn\u00e1v\u00e1n\u00ed parametr\u016f nen\u00ed pou\u017eita \u0161ifrov\u00e1n\u00ed, a proto m\u00e1 \u00fato\u010dn\u00edk mo\u017enost zas\u00e1hnout do v\u00fdm\u011bny dat mezi kontrol\u00e9ry a nahradit paket s navrhovanou velikost\u00ed entropie. Jeliko\u017e je povolen\u00e1 velikost kl\u00ed\u010de v rozmez\u00ed od 1 do 16 byte, druh\u00fd kontrol\u00e9r tuto hodnotu p\u0159ijme a ode\u0161le sv\u00e9 potvrzen\u00ed s uveden\u00edm podobn\u00e9 velikosti.<\/p>\n

\"\u00datok<\/a><\/noindex><\/center><\/p>\n

Pro reprodukci zranitelnosti v laboratorn\u00edch podm\u00ednk\u00e1ch (\u010dinnost \u00fato\u010dn\u00edka byla emulov\u00e1na na jednom z za\u0159\u00edzen\u00ed) byl navr\u017een
\nprototyp n\u00e1stroj\u016f<\/a><\/noindex> pro proveden\u00ed \u00fatoku.
\nPro skute\u010dn\u00fd \u00fatok mus\u00ed \u00fato\u010dn\u00edk b\u00fdt v dosahu za\u0159\u00edzen\u00ed ob\u011bt\u00ed a m\u00edt mo\u017enost kr\u00e1tkodob\u011b blokovat sign\u00e1l ka\u017ed\u00e9ho za\u0159\u00edzen\u00ed, co\u017e se navrhuje realizovat prost\u0159ednictv\u00edm manipulace se sign\u00e1lem nebo reaktivn\u00edm ru\u0161en\u00edm. <\/p>\n

Organizace Bluetooth SIG, odpov\u011bdn\u00e1 za v\u00fdvoj standard\u016f Bluetooth, publikovala<\/a><\/noindex> prov\u00e1d\u00ed \u00fapravy specifikace s \u010d\u00edslem 11838, v n\u00ed\u017e byly navr\u017eeny opat\u0159en\u00ed pro v\u00fdrobce k blokov\u00e1n\u00ed zranitelnosti (minim\u00e1ln\u00ed velikost \u0161ifrovac\u00edho kl\u00ed\u010de byla zv\u00fd\u0161ena z 1 na 7). Probl\u00e9m se projevuje<\/a><\/noindex> v v\u0161echny<\/a><\/noindex> odpov\u00eddaj\u00edc\u00edch standardu Bluetooth stech a firmwarech Bluetooth \u010dip\u016f, v\u010detn\u011b produkt\u016f Intel<\/a><\/noindex>, Broadcom, Lenovo<\/a><\/noindex>, Apple<\/a><\/noindex>, Microsoft<\/a><\/noindex>, Qualcomm, Linux, Android<\/a><\/noindex>, Blackberry<\/a><\/noindex> a Cisco<\/a><\/noindex> (ze 14 testovan\u00fdch \u010dip\u016f byly v\u0161echny zraniteln\u00e9). Do Bluetooth z\u00e1sobn\u00edku j\u00e1dra Linuxu byla p\u0159id\u00e1na<\/a><\/noindex> oprava, kter\u00e1 umo\u017e\u0148uje zm\u011bnit minim\u00e1ln\u00ed velikost \u0161ifrovac\u00edho kl\u00ed\u010de. <\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e\u0431 \u0430\u0442\u0430\u043a\u0435 KNOB (Key Negotiation Of Bluetooth), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u0435\u0440\u0435\u0445\u0432\u0430\u0442 \u0438 \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0432 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c Bluetooth-\u0442\u0440\u0430\u0444\u0438\u043a\u0435. \u0418\u043c\u0435\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u044f\u043c\u0443\u044e \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0443 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 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\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043a\u043b\u044e\u0447\u0430 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u044f. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043d\u0435\u0434\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430\u043c\u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27914,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-37225","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47\u00datok KNOB, kter\u00fd umo\u017e\u0148uje zachycen\u00ed 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