{"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\/hu\/blog\/news\/ataka-knob-pozvolyayushhaya-perehvatit-zashifrovannyj-trafik-bluetooth","title":{"rendered":"A KNOB t\u00e1mad\u00e1sa, amely lehet\u0151v\u00e9 teszi a Bluetooth titkos\u00edtott forgalom elfog\u00e1s\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kib\u0151v\u00fclt<\/a><\/noindex> inform\u00e1ci\u00f3k<\/a><\/noindex> a t\u00e1mad\u00e1sr\u00f3l KNOB<\/a><\/noindex> (Key Negotiation Of Bluetooth), amely lehet\u0151v\u00e9 teszi az inform\u00e1ci\u00f3k elfog\u00e1s\u00e1t \u00e9s becsap\u00e1s\u00e1t a titkos\u00edtott Bluetooth-forgalomban. Azzal, hogy meg tudja akad\u00e1lyozni a csomagok k\u00f6zvetlen tov\u00e1bb\u00edt\u00e1s\u00e1t a Bluetooth-eszk\u00f6z\u00f6k kapcsolat\u00e1nak meg\u00e1llap\u00edt\u00e1sa sor\u00e1n, a t\u00e1mad\u00f3 el\u00e9rheti, hogy a kapcsolat sor\u00e1n 1 byte entropi\u00e1t tartalmaz\u00f3 kulcsokat haszn\u00e1ljanak, ami lehet\u0151v\u00e9 teszi a brute-force m\u00f3dszer alkalmaz\u00e1s\u00e1t a titkos\u00edt\u00e1si kulcs meghat\u00e1roz\u00e1s\u00e1hoz. <\/p>\n

A probl\u00e9ma a Bluetooth BR\/EDR Core 5.1 \u00e9s kor\u00e1bbi verzi\u00f3k specifik\u00e1ci\u00f3j\u00e1ban tal\u00e1lhat\u00f3 hi\u00e1nyoss\u00e1gokb\u00f3l (CVE-2019-9506) ad\u00f3dik, amelyek lehet\u0151v\u00e9 teszik a t\u00fal r\u00f6vid titkos\u00edt\u00e1si kulcsok haszn\u00e1lat\u00e1t, \u00e9s nem akad\u00e1lyozz\u00e1k meg a t\u00e1mad\u00f3 beavatkoz\u00e1s\u00e1t a kapcsolat meg\u00e1llap\u00edt\u00e1s\u00e1nak f\u00e1zis\u00e1ban, lehet\u0151v\u00e9 t\u00e9ve a megb\u00edzhatatlan kulcsokra val\u00f3 visszav\u00e1lt\u00e1st (a nem hiteles\u00edtett t\u00e1mad\u00f3 \u00e1ltal sz\u00e1ll\u00edtott csomagok becsap\u00e1sa lehets\u00e9ges). A t\u00e1mad\u00e1st a k\u00e9sz\u00fcl\u00e9kek k\u00f6z\u00f6tti kapcsolat meg\u00e1llap\u00edt\u00e1sakor lehet v\u00e9grehajtani (a m\u00e1r meg\u00e1llap\u00edtott \u00fcl\u00e9sek nem t\u00e1madhat\u00f3k meg), \u00e9s csak a BR\/EDR (Bluetooth Basic Rate\/Enhanced Data Rate) m\u00f3dokban hat\u00e9kony, ha mindk\u00e9t eszk\u00f6z sebezhet\u0151. A kulcs sikeres kiv\u00e1laszt\u00e1sa eset\u00e9n a t\u00e1mad\u00f3 visszafejtheti a tov\u00e1bb\u00edtott adatokat, \u00e9s \u00e9szrev\u00e9tlen\u00fcl becsaphatja a rendszert tetsz\u0151leges titkos\u00edtott sz\u00f6veggel.<\/p>\n

K\u00e9t Bluetooth-vez\u00e9rl\u0151 A \u00e9s B k\u00f6z\u00f6tti kapcsolat l\u00e9tes\u00edt\u00e9sekor az A vez\u00e9rl\u0151 a csatorna kulcs (link key) hiteles\u00edt\u00e9se ut\u00e1n javasolhatja, hogy a titkos\u00edt\u00e1si kulcshoz (encryption key) 16 byte entropi\u00e1t haszn\u00e1ljanak, \u00e9s a B vez\u00e9rl\u0151 elfogadhatja ezt az \u00e9rt\u00e9ket vagy kisebb \u00e9rt\u00e9ket adhat meg, ha nem k\u00e9pes a megadott m\u00e9ret\u0171 kulcsot l\u00e9trehozni. V\u00e1laszul az A vez\u00e9rl\u0151 elfogadhatja a visszaigazol\u00e1st, \u00e9s aktiv\u00e1lhatja a titkos\u00edtott kommunik\u00e1ci\u00f3s csatorn\u00e1t. Ezen a ponton a param\u00e9terek meg\u00e1llap\u00edt\u00e1sa sor\u00e1n m\u00e9g nem alkalmaznak titkos\u00edt\u00e1st, ez\u00e9rt a t\u00e1mad\u00f3 k\u00e9pes beavatkozni a vez\u00e9rl\u0151k k\u00f6z\u00f6tti adatcser\u00e9be, \u00e9s m\u00f3dos\u00edtani a javasolt entropia m\u00e9ret\u0171 csomagot. Mivel a megengedett kulcsm\u00e9ret 1 \u00e9s 16 byte k\u00f6z\u00f6tt v\u00e1ltozik, a m\u00e1sodik vez\u00e9rl\u0151 elfogadja ezt az \u00e9rt\u00e9ket, \u00e9s visszaigazol\u00e1s\u00e1t azonos m\u00e9rettel k\u00fcldi el.<\/p>\n

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

A sebezhet\u0151s\u00e9gek laborat\u00f3riumi k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tti reproduk\u00e1l\u00e1s\u00e1hoz (a t\u00e1mad\u00f3 aktivit\u00e1s\u00e1t egy eszk\u00f6z\u00f6n szimul\u00e1lt\u00e1k) javasolt
\neszk\u00f6zgy\u0171jtem\u00e9ny protot\u00edpusa<\/a><\/noindex> a t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz.
\nVal\u00f3di t\u00e1mad\u00e1s eset\u00e9n a t\u00e1mad\u00f3nak a c\u00e9lpont eszk\u00f6z\u00f6k v\u00e9teli ter\u00fclet\u00e9n kell lennie, \u00e9s k\u00e9pesnek kell lennie a jel r\u00f6vid t\u00e1v\u00fa blokkol\u00e1s\u00e1ra, amelyet a jel manipul\u00e1l\u00e1s\u00e1val vagy reakci\u00f3s zavar\u00f3val javasoltak megval\u00f3s\u00edtani. <\/p>\n

A Bluetooth SIG szervezet, amely a Bluetooth szabv\u00e1nyok kidolgoz\u00e1s\u00e1\u00e9rt felel\u0151s, kiadta<\/a><\/noindex> a 11838-as sz\u00e1m\u00fa specifik\u00e1ci\u00f3 m\u00f3dos\u00edt\u00e1s\u00e1t javasolja, amelyben a gy\u00e1rt\u00f3k sz\u00e1m\u00e1ra int\u00e9zked\u00e9seket aj\u00e1nlanak a sebezhet\u0151s\u00e9g blokkol\u00e1s\u00e1ra (a titkos\u00edt\u00e1si kulcs minim\u00e1lis m\u00e9rete 1-r\u0151l 7-re emelkedett). A probl\u00e9ma manifests<\/a><\/noindex> a adattal, teh\u00e1t csak a TXE jelz\u0151 nem lesz elegend\u0151.<\/a><\/noindex> Bluetooth szabv\u00e1nynak megfelel\u0151 Bluetooth stackek \u00e9s Bluetooth chip firmware-ek tekintet\u00e9ben, bele\u00e9rtve a Intel<\/a><\/noindex>, Broadcom, Lenovo<\/a><\/noindex>, Apple<\/a><\/noindex>, Microsoft<\/a><\/noindex>, Qualcomm, Linux, Android<\/a><\/noindex>, Blackberry<\/a><\/noindex> \u00e9s Cisco<\/a><\/noindex> (a 14 tesztelt chipb\u0151l mindegyik sebezhet\u0151nek bizonyult). A Linux kernel Bluetooth stack be lett vezetve<\/a><\/noindex> jav\u00edt\u00e1st tartalmaz, amely lehet\u0151v\u00e9 teszi a titkos\u00edt\u00e1si kulcs minimumunk m\u00e9ret\u00e9nek megv\u00e1ltoztat\u00e1s\u00e1t. <\/p>\n

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

Forr\u00e1s: 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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