{"id":32375,"date":"2019-10-31T21:46:40","date_gmt":"2019-10-31T18:46:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-chipah-qualcomm-pozvolyayushhaya-izvlech-zakrytye-klyuchi-iz-hranilishha-trustzone\/"},"modified":"2019-10-31T21:46:40","modified_gmt":"2019-10-31T18:46:40","slug":"uyazvimost-v-chipah-qualcomm-pozvolyayushhaya-izvlech-zakrytye-klyuchi-iz-hranilishha-trustzone","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-chipah-qualcomm-pozvolyayushhaya-izvlech-zakrytye-klyuchi-iz-hranilishha-trustzone","title":{"rendered":"A Qualcomm chip vulnerability allows the extraction of private keys from the TrustZone storage.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Az NCC Group kutat\u00f3i felfedt\u00e9k<\/a><\/noindex> a r\u00e9szleteket<\/noindex> sebezhet\u0151s\u00e9gek (CVE-2018-11976<\/a><\/noindex>) a Qualcomm chipjeiben, amely lehet\u0151v\u00e9 teszi a titkos\u00edt\u00e1si z\u00e1r Kulcsok tartalm\u00e1nak meghat\u00e1roz\u00e1s\u00e1t, amelyek a Qualcomm QSEE (Qualcomm Secure Execution Environment) elszigetelt k\u00f6rnyezet\u00e9ben tal\u00e1lhat\u00f3ak, az ARM TrustZone technol\u00f3gi\u00e1n alapulva. A probl\u00e9ma a k\u00f6vetkez\u0151 ter\u00fcleteken nyilv\u00e1nul meg a legt\u00f6bb<\/a><\/noindex> Snapdragon SoC-ban, amelyek elterjedtek az Android platform alap\u00fa okostelefonokban. A probl\u00e9m\u00e1t orvosl\u00f3 jav\u00edt\u00e1sok m\u00e1r beleker\u00fcltek<\/a><\/noindex> Az Android \u00e1prilisi friss\u00edt\u00e9s\u00e9be \u00e9s az \u00faj Qualcomm chip firmware kiad\u00e1sokba ker\u00fclt bele. A Qualcomm sz\u00e1m\u00e1ra t\u00f6bb mint egy \u00e9vbe telt a jav\u00edt\u00e1s el\u0151k\u00e9sz\u00edt\u00e9se \u2014 az eredeti inform\u00e1ci\u00f3k a sebezhet\u0151s\u00e9gr\u0151l m\u00e1r 2018. m\u00e1rcius 19-\u00e9n eljutottak a Qualcommhoz.<\/p>\n

Ne feledj\u00fck, hogy az ARM TrustZone technol\u00f3gia lehet\u0151v\u00e9 teszi hardveresen elszigetelt v\u00e9dett k\u00f6rnyezetek l\u00e9trehoz\u00e1s\u00e1t, amelyek teljesen elk\u00fcl\u00f6n\u00fclnek a f\u0151 rendszert\u0151l, \u00e9s egy k\u00fcl\u00f6n virtu\u00e1lis processzoron futnak, k\u00fcl\u00f6n szakosodott oper\u00e1ci\u00f3s rendszert haszn\u00e1lva. A TrustZone alapvet\u0151 c\u00e9lja a titkos\u00edt\u00f3 kulcsok, biometrikus azonos\u00edt\u00e1s, fizet\u00e9si adatok \u00e9s egy\u00e9b \u00e9rz\u00e9keny inform\u00e1ci\u00f3k elszigetelt v\u00e9grehajt\u00e1s\u00e1nak biztos\u00edt\u00e1sa. A f\u0151 oper\u00e1ci\u00f3s rendszerrel val\u00f3 kapcsolat k\u00f6zvetetten a diszp\u00e9tcer interf\u00e9szen kereszt\u00fcl t\u00f6rt\u00e9nik. A titkos\u00edt\u00f3 z\u00e1r kulcsok egy hardveresen elszigetelt kulcsot t\u00e1rol\u00f3 rendszerben helyezkednek el, ami megfelel\u0151 megval\u00f3s\u00edt\u00e1s eset\u00e9n megakad\u00e1lyozza a f\u0151 rendszer kompromitt\u00e1l\u00f3d\u00e1sa eset\u00e9n t\u00f6rt\u00e9n\u0151 kisziv\u00e1rg\u00e1sukat.<\/p>\n

A sebezhet\u0151s\u00e9g egy hib\u00e1s megval\u00f3s\u00edt\u00e1ssal f\u00fcgg \u00f6ssze az elliptikus g\u00f6rb\u00e9k feldolgoz\u00e1si algoritmus\u00e1ban, amely az inform\u00e1ci\u00f3k kisziv\u00e1rg\u00e1s\u00e1hoz vezetett a feldolgoz\u00e1si folyamat sor\u00e1n. A kutat\u00f3k olyan mell\u00e9kcsatorn\u00e1s t\u00e1mad\u00e1si technik\u00e1t dolgoztak ki, amely lehet\u0151v\u00e9 teszi a megl\u00e9v\u0151 k\u00f6zvetett kisziv\u00e1rg\u00e1sok alapj\u00e1n a hardveresen elszigetelt Android Keystore<\/a><\/noindex>. A kisziv\u00e1rg\u00e1sok a j\u00f3l m\u0171k\u00f6d\u0151 prediktor blokkj\u00e1nak aktivit\u00e1s\u00e1nak \u00e9s a mem\u00f3riaadatokhoz val\u00f3 hozz\u00e1f\u00e9r\u00e9s idej\u00e9nek elemz\u00e9se alapj\u00e1n ker\u00fclnek meghat\u00e1roz\u00e1sra. K\u00eds\u00e9rleteik sor\u00e1n a kutat\u00f3k sikeresen bemutatt\u00e1k a 224- \u00e9s 256-bites ECDSA kulcsok vissza\u00e1ll\u00edt\u00e1s\u00e1t egy hardveresen elszigetelt kulcsot t\u00e1rol\u00f3 rendszerb\u0151l, amely egy Nexus 5X okostelefonban volt haszn\u00e1latban. A kulcs vissza\u00e1ll\u00edt\u00e1s\u00e1hoz k\u00f6r\u00fclbel\u00fcl 12 ezer digit\u00e1lis al\u00e1\u00edr\u00e1s gener\u00e1l\u00e1s\u00e1ra volt sz\u00fcks\u00e9g, ami t\u00f6bb mint 14 \u00f3r\u00e1t vett ig\u00e9nybe. A t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz Cachegrab<\/a><\/noindex>.<\/p>\n

A probl\u00e9ma f\u0151 oka a k\u00f6z\u00f6s hardverkomponensek \u00e9s a cache k\u00f6z\u00f6s haszn\u00e1lata a TrustZone sz\u00e1m\u00edt\u00e1sai \u00e9s a f\u0151 rendszer k\u00f6z\u00f6tt \u2014 az elszigetel\u00e9s logikai elv\u00e1laszt\u00e1s szintj\u00e9n t\u00f6rt\u00e9nik, de k\u00f6z\u00f6s sz\u00e1m\u00edt\u00e1si blokkok felhaszn\u00e1l\u00e1s\u00e1val, \u00e9s a sz\u00e1m\u00edt\u00e1sok nyomai, valamint az \u00e1tmeneti c\u00edmek inform\u00e1ci\u00f3i a k\u00f6z\u00f6s processzor cache-ben maradnak. A Prime+Probe m\u00f3dszer seg\u00edts\u00e9g\u00e9vel, amely a cache-hez val\u00f3 hozz\u00e1f\u00e9r\u00e9s idej\u00e9nek v\u00e1ltoz\u00e1s\u00e1nak \u00e9rt\u00e9kel\u00e9s\u00e9n alapul, a cache-ben tal\u00e1lhat\u00f3 mint\u00e1k ellen\u0151rz\u00e9s\u00e9vel viszonylag magas pontoss\u00e1ggal nyomon lehet k\u00f6vetni az adatfolyamokat \u00e9s a digit\u00e1lis al\u00e1\u00edr\u00e1sok TrustZone-ba kapcsol\u00f3d\u00f3 sz\u00e1m\u00edt\u00e1sainak v\u00e9grehajt\u00e1s\u00e1nak nyomait. <\/p>\n

Az ECDSA kulcsokkal t\u00f6rt\u00e9n\u0151 digit\u00e1lis al\u00e1\u00edr\u00e1s l\u00e9trehoz\u00e1s\u00e1nak nagy r\u00e9sze a Qualcomm chipekben az \u00e1lland\u00f3 inicializ\u00e1l\u00f3 vektorral folytatott ciklikus szorz\u00e1si m\u0171veleteken megy el (nonce<\/a><\/noindex>). Ha a t\u00e1mad\u00f3 vissza tud \u00e1ll\u00edtani n\u00e9h\u00e1ny bitet a megadott vektorr\u00f3l, lehet\u0151s\u00e9ge ny\u00edlik a z\u00e1rt kulcs teljes helyre\u00e1ll\u00edt\u00e1s\u00e1ra ir\u00e1nyul\u00f3 t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1ra. <\/p>\n

A Qualcomm eset\u00e9ben k\u00e9t helyet azonos\u00edtottak, ahol hasonl\u00f3 inform\u00e1ci\u00f3k sziv\u00e1roghatnak az \u00f6sszes\u00edt\u0151 algoritmus szorz\u00e1si folyamat\u00e1ban: a t\u00e1bl\u00e1zatos keres\u00e9si m\u0171veletek sor\u00e1n \u00e9s a felt\u00e9teles adatkinyer\u00e9s sor\u00e1n, amely a nonce vektor utols\u00f3 bitj\u00e9nek \u00e9rt\u00e9k\u00e9n alapul. Annak ellen\u00e9re, hogy a Qualcomm k\u00f3dj\u00e1ban vannak int\u00e9zked\u00e9sek az adatok harmadik f\u00e9l \u00e1ltali sziv\u00e1rg\u00e1sa ellen, a kidolgozott t\u00e1mad\u00e1si m\u00f3dszer lehet\u0151v\u00e9 teszi e v\u00e9dekez\u00e9si int\u00e9zked\u00e9sek megker\u00fcl\u00e9s\u00e9t \u00e9s t\u00f6bb bit \u00e9rt\u00e9k\u00e9nek meghat\u00e1roz\u00e1s\u00e1t a nonce-b\u00f3l, ami elegend\u0151 a 256-bites ECDSA kulcsok helyre\u00e1ll\u00edt\u00e1s\u00e1hoz.<\/p>\n

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

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

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 NCC Group \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0434\u0435\u0442\u0430\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2018-11976) \u0432 \u0447\u0438\u043f\u0430\u0445 Qualcomm, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0445 \u043a\u043b\u044e\u0447\u0435\u0439 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u044f, \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d\u043d\u044b\u0445 \u0432 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u0430\u043d\u043a\u043b\u0430\u0432\u0435 Qualcomm QSEE (Qualcomm Secure Execution Environment), \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043d\u0430 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 ARM TrustZone. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0435 SoC Snapdragon, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0445 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432 \u0441\u043c\u0430\u0440\u0442\u0444\u043e\u043d\u0430\u0445 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b Android. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f, \u0443\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443, \u0443\u0436\u0435 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u044b \u0432 \u0430\u043f\u0440\u0435\u043b\u044c\u0441\u043a\u043e\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-32375","post","type-post","status-publish","format-standard","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\udd47Sebezhet\u0151s\u00e9g a Qualcomm chipekben, amely lehet\u0151v\u00e9 teszi a z\u00e1rt kulcsok kinyer\u00e9s\u00e9t a TrustZone t\u00e1rol\u00f3b\u00f3l | ProHoster","description":"Az NCC Group kutat\u00f3i felfedt\u00e9k a sebezhet\u0151s\u00e9g 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