{"id":41415,"date":"2020-02-10T20:42:08","date_gmt":"2020-02-10T17:42:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-android-pozvolyayushhaya-udalyonno-vypolnit-kod-pri-vklyuchyonnom-bluetooth"},"modified":"2020-02-10T20:42:08","modified_gmt":"2020-02-10T17:42:08","slug":"uyazvimost-v-android-pozvolyayushhaya-udalyonno-vypolnit-kod-pri-vklyuchyonnom-bluetooth","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/uyazvimost-v-android-pozvolyayushhaya-udalyonno-vypolnit-kod-pri-vklyuchyonnom-bluetooth","title":{"rendered":"Android sebezhet\u0151s\u00e9g, amely lehet\u0151v\u00e9 teszi a t\u00e1voli k\u00f3d v\u00e9grehajt\u00e1s\u00e1t Bluetooth bekapcsolt \u00e1llapotban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Febru\u00e1ri friss\u00edt\u00e9s<\/a><\/noindex> az Android platformon kritikus vulnerability<\/a><\/noindex> (CVE-2020-0022) a Bluetooth stackben, lehet\u0151v\u00e9 t\u00e9ve a t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st egy k\u00fcl\u00f6nlegesen form\u00e1zott Bluetooth csomag k\u00fcld\u00e9s\u00e9vel. A probl\u00e9m\u00e1t \u00e9szrev\u00e9tlen\u00fcl kihaszn\u00e1lhatja egy t\u00e1mad\u00f3, aki a Bluetooth el\u00e9rhet\u0151s\u00e9gi t\u00e1vols\u00e1g\u00e1n bel\u00fcl van. Nem kiz\u00e1rt, hogy a sebezhet\u0151s\u00e9get f\u00e9rgek l\u00e9trehoz\u00e1s\u00e1ra haszn\u00e1lj\u00e1k, amelyek l\u00e1ncba kapcsol\u00f3dva t\u00e1madj\u00e1k meg a szomsz\u00e9dos eszk\u00f6z\u00f6ket. <\/p>\n

A t\u00e1mad\u00e1shoz elegend\u0151 ismerni az \u00e1ldozat eszk\u00f6z\u00e9nek MAC-c\u00edm\u00e9t (el\u0151zetes p\u00e1ros\u00edt\u00e1s nem sz\u00fcks\u00e9ges, de az eszk\u00f6z Bluetooth-j\u00e1nak be kell kapcsolva lennie). N\u00e9h\u00e1ny eszk\u00f6z eset\u00e9ben a Bluetooth MAC-c\u00edm\u00e9t a Wi-Fi MAC-c\u00edm alapj\u00e1n is ki lehet sz\u00e1m\u00edtani. A sebezhet\u0151s\u00e9g sikeres kihaszn\u00e1l\u00e1sa eset\u00e9n a t\u00e1mad\u00f3 a h\u00e1tt\u00e9rfolyamat jogai alatt hajthatja v\u00e9gre a k\u00f3dj\u00e1t, amely koordin\u00e1lja a Bluetooth m\u0171k\u00f6d\u00e9s\u00e9t az Androidon.
\nA probl\u00e9ma specifikus az Android Bluetooth stackben Fluoride<\/a><\/noindex> (a Broadcom BlueDroid projekt k\u00f3dj\u00e1n alapul) \u00e9s nem jelenik meg a Linux stackben, a BlueZ-ben.<\/p>\n

A probl\u00e9m\u00e1t felfedez\u0151 kutat\u00f3k sikeresen k\u00e9sz\u00edtettek egy m\u0171k\u00f6d\u0151 exploit protot\u00edpust, de a kihaszn\u00e1l\u00e1s r\u00e9szletei k\u00e9s\u0151bb fognak<\/a><\/noindex> nyilv\u00e1noss\u00e1gra ker\u00fclni, miut\u00e1n a jav\u00edt\u00e1st eljuttatj\u00e1k a felhaszn\u00e1l\u00f3k t\u00f6bbs\u00e9g\u00e9hez. Csak annyit tudunk, hogy a sebezhet\u0151s\u00e9g a csomagok \u00fajraszerkeszt\u00e9s\u00e9vel kapcsolatos k\u00f3dokban \u00e9s is caused by<\/a><\/noindex> a L2CAP (Logical Link Control and Adaptation Protocol) csomagok m\u00e9ret\u00e9nek hib\u00e1s sz\u00e1m\u00edt\u00e1s\u00e1val van jelen, abban az esetben, ha a k\u00fcld\u0151 \u00e1ltal \u00e1tadott adatok meghaladj\u00e1k a v\u00e1rt m\u00e9retet.<\/p>\n

Android 8 \u00e9s 9 verzi\u00f3kban a probl\u00e9ma k\u00f3d v\u00e9grehajt\u00e1s\u00e1hoz vezethet, m\u00edg Android 10 alatt a Bluetooth h\u00e1tt\u00e9rfolyamat\u00e1nak \u00f6sszeoml\u00e1s\u00e1ra korl\u00e1toz\u00f3dik. R\u00e9gebbi Android kiad\u00e1sok is potenci\u00e1lisan \u00e9rintettek lehetnek, de a sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1nak lehet\u0151s\u00e9g\u00e9t nem tesztelt\u00e9k. A felhaszn\u00e1l\u00f3knak javasolt, hogy min\u00e9l hamarabb telep\u00edtsenek firmware-friss\u00edt\u00e9st, \u00e9s ha ez nem lehets\u00e9ges, alap\u00e9rtelmez\u00e9s szerint tilts\u00e1k le a Bluetooth-t, akad\u00e1lyozz\u00e1k meg a k\u00e9sz\u00fcl\u00e9k \u00e9szlel\u00e9s\u00e9t, \u00e9s csak v\u00e9gsz\u00fcks\u00e9g eset\u00e9n aktiv\u00e1lj\u00e1k a Bluetooth-t nyilv\u00e1nos helyeken (p\u00e9ld\u00e1ul a vezet\u00e9k n\u00e9lk\u00fcli f\u00fclhallgat\u00f3kat vezet\u00e9kesekre is cser\u00e9lhetik). <\/p>\n

A fent eml\u00edtett probl\u00e9ma mellett a febru\u00e1ri<\/a><\/noindex> Android biztons\u00e1gi jav\u00edt\u00e1sok csomagj\u00e1ban 26 sebezhet\u0151s\u00e9get sz\u00fcntettek meg, amelyek k\u00f6z\u00fcl egy m\u00e1sik sebezhet\u0151s\u00e9g (CVE-2020-0023) kritikus szint\u0171 vesz\u00e9lyt kapott. A m\u00e1sodik sebezhet\u0151s\u00e9g szint\u00e9n \u00e9rinti<\/a><\/noindex> A Bluetooth stack \u00e9s a BLUETOOTH_PRIVILEGED jogosults\u00e1g helytelen kezel\u00e9s\u00e9vel kapcsolatos. Ami a vesz\u00e9lyesnek min\u0151s\u00edtett sebezhet\u0151s\u00e9geket illeti, 7 probl\u00e9ma ker\u00fclte el a kereteket \u00e9s alkalmaz\u00e1sokat, 4 a rendszerkomponenseken, 2 a kernelben \u00e9s 10 ny\u00edlt \u00e9s z\u00e1rt forr\u00e1s\u00fa Qualcomm chipk komponensben.<\/p>\n

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

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0444\u0435\u0432\u0440\u0430\u043b\u044c\u0441\u043a\u043e\u043c \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0438 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b Android \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-0022) \u0432 Bluetooth-\u0441\u0442\u0435\u043a\u0435, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e Bluetooth-\u043f\u0430\u043a\u0435\u0442\u0430. 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