{"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\/cs\/blog\/news\/uyazvimost-v-chipah-qualcomm-pozvolyayushhaya-izvlech-zakrytye-klyuchi-iz-hranilishha-trustzone","title":{"rendered":"Zranitelnost v \u010dipech Qualcomm, kter\u00e1 umo\u017e\u0148uje extrahovat tajn\u00e9 kl\u00ed\u010de z \u00falo\u017ei\u0161t\u011b TrustZone.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdzkumn\u00edci ze spole\u010dnosti NCC Group odhalili<\/a><\/noindex> detaily<\/noindex> zranitelnosti (CVE-2018-11976<\/a><\/noindex>) v \u010dipech Qualcomm, co\u017e umo\u017e\u0148uje zjistit obsah chr\u00e1n\u011bn\u00fdch \u0161ifrovac\u00edch kl\u00ed\u010d\u016f um\u00edst\u011bn\u00fdch v izolovan\u00e9m enclave Qualcomm QSEE (Qualcomm Secure Execution Environment), postaven\u00e9m na technologii ARM TrustZone. Probl\u00e9m se projevuje v ve v\u011bt\u0161in\u011b<\/a><\/noindex> SoC Snapdragon, kter\u00e9 se roz\u0161\u00ed\u0159ily ve smartphonech zalo\u017een\u00fdch na platform\u011b Android. Opravy, kter\u00e9 probl\u00e9m vy\u0159e\u0161\u00ed, ji\u017e byly zahrnuty<\/a><\/noindex> Do dubnov\u00e9 aktualizace Androidu a do nov\u00fdch verz\u00ed firmwaru pro \u010dipy Qualcomm. P\u0159\u00edprav\u011b opravy spole\u010dnosti Qualcomm trvalo v\u00edce ne\u017e rok \u2014 p\u016fvodn\u011b byly informace o zranitelnosti zasl\u00e1ny firm\u011b Qualcomm ji\u017e 19. b\u0159ezna 2018.<\/p>\n

P\u0159ipom\u00edn\u00e1me, \u017ee technologie ARM TrustZone umo\u017e\u0148uje vytv\u00e1\u0159et hardwarov\u011b izolovan\u00e1 zabezpe\u010den\u00e1 prost\u0159ed\u00ed, kter\u00e1 jsou zcela odd\u011blena od hlavn\u00edho syst\u00e9mu a b\u011b\u017e\u00ed na samostatn\u00e9m virtu\u00e1ln\u00edm procesoru s vyu\u017eit\u00edm specializovan\u00e9ho opera\u010dn\u00edho syst\u00e9mu. Hlavn\u00edm \u00fa\u010delem TrustZone je zaji\u0161t\u011bn\u00ed izolovan\u00e9ho prov\u00e1d\u011bn\u00ed obslu\u017en\u00fdch rutin \u0161ifrovac\u00edch kl\u00ed\u010d\u016f, biometrick\u00e9 autentizace, platebn\u00edch dat a dal\u0161\u00edch d\u016fv\u011brn\u00fdch informac\u00ed. Interakce s hlavn\u00edm OS prob\u00edh\u00e1 nep\u0159\u00edmo prost\u0159ednictv\u00edm rozhran\u00ed pro spr\u00e1vu. Chr\u00e1n\u011bn\u00e9 \u0161ifrovac\u00ed kl\u00ed\u010de jsou ulo\u017eeny uvnit\u0159 hardwarov\u011b izolovan\u00e9ho \u00falo\u017ei\u0161t\u011b kl\u00ed\u010d\u016f, co\u017e p\u0159i spr\u00e1vn\u00e9 implementaci umo\u017e\u0148uje zabr\u00e1nit jejich \u00faniku v p\u0159\u00edpad\u011b kompromitace hlavn\u00edho syst\u00e9mu.<\/p>\n

Zranitelnost souvis\u00ed s nedostatkem v implementaci algoritmu zpracov\u00e1n\u00ed elliptick\u00fdch k\u0159ivek, co\u017e vedlo k \u00faniku informac\u00ed o pr\u016fb\u011bhu zpracov\u00e1n\u00ed dat. V\u00fdzkumn\u00edci vyvinuli techniku \u00fatoku p\u0159es bo\u010dn\u00ed kan\u00e1ly, kter\u00e1 umo\u017e\u0148uje na z\u00e1klad\u011b existuj\u00edc\u00edch nep\u0159\u00edm\u00fdch \u00fanik\u016f rekonstruovat obsah chr\u00e1n\u011bn\u00fdch kl\u00ed\u010d\u016f ulo\u017een\u00fdch v hardwarov\u011b izolovan\u00e9m Android Keystore<\/a><\/noindex>. \u00daniky byly identifikov\u00e1ny na z\u00e1klad\u011b anal\u00fdzy aktivity bloku p\u0159edpov\u011bdi p\u0159echod\u016f a zm\u011bny doby p\u0159\u00edstupu k dat\u016fm v pam\u011bti. B\u011bhem experimentu v\u00fdzkumn\u00edci \u00fasp\u011b\u0161n\u011b demonstrovali obnovu 224- a 256bitov\u00fdch kl\u00ed\u010d\u016f ECDSA z hardwarov\u011b izolovan\u00e9ho \u00falo\u017ei\u0161t\u011b kl\u00ed\u010d\u016f, kter\u00e9 se pou\u017e\u00edv\u00e1 ve smartphonu Nexus 5X. Pro obnovu kl\u00ed\u010de bylo t\u0159eba vygenerovat p\u0159ibli\u017en\u011b 12 tis\u00edc digit\u00e1ln\u00edch podpis\u016f, co\u017e zabralo v\u00edce ne\u017e 14 hodin. K proveden\u00ed \u00fatoku byl pou\u017eit n\u00e1strojov\u00fd software Cachegrab<\/a><\/noindex>.<\/p>\n

Hlavn\u00ed p\u0159\u00ed\u010dinou vzniku probl\u00e9mu je sd\u00edlen\u00ed spole\u010dn\u00fdch hardwarov\u00fdch komponent\u016f a cache pro v\u00fdpo\u010dty v TrustZone a v hlavn\u00edm syst\u00e9mu \u2014 izolace byla provedena na \u00farovni logick\u00e9ho rozd\u011blen\u00ed, ale pou\u017eit\u00edm spole\u010dn\u00fdch v\u00fdpo\u010detn\u00edch blok\u016f a s ukl\u00e1d\u00e1n\u00edm stop v\u00fdpo\u010dt\u016f a informac\u00ed o adres\u00e1ch p\u0159echod\u016f v obecn\u00e9 cache procesoru. Pomoc\u00ed metody Prime+Probe, zalo\u017een\u00e9 na hodnocen\u00ed zm\u011bny doby p\u0159\u00edstupu k cachovan\u00e9 informaci, lze prost\u0159ednictv\u00edm kontroly p\u0159\u00edtomnosti ur\u010dit\u00fdch vzor\u016f v cache s dostate\u010dn\u011b vysokou p\u0159esnost\u00ed sledovat toky dat a zn\u00e1mky vykon\u00e1v\u00e1n\u00ed k\u00f3du souvisej\u00edc\u00edho s v\u00fdpo\u010dtem digit\u00e1ln\u00edch podpis\u016f v TrustZone. <\/p>\n

V\u011bt\u0161ina \u010dasu pot\u0159ebn\u00e9ho k vytvo\u0159en\u00ed digit\u00e1ln\u00edho podpisu pomoc\u00ed kl\u00ed\u010d\u016f ECDSA v \u010dipech Qualcomm je vynakl\u00e1d\u00e1na na prov\u00e1d\u011bn\u00ed operac\u00ed n\u00e1soben\u00ed v cyklu s vyu\u017eit\u00edm nem\u011bnn\u00e9ho vektoru inicializace pro ka\u017ed\u00fd podpis (nonce<\/a><\/noindex>). Pokud se \u00fato\u010dn\u00edkovi poda\u0159\u00ed obnovit alespo\u0148 n\u011bkolik bit\u016f informac\u00ed o tomto vektoru, vznik\u00e1 mo\u017enost proveden\u00ed \u00fatoku spo\u010d\u00edvaj\u00edc\u00edho v sekven\u010dn\u00edm obnoven\u00ed cel\u00e9ho uzav\u0159en\u00e9ho kl\u00ed\u010de. <\/p>\n

V p\u0159\u00edpad\u011b Qualcomm byly identifikov\u00e1ny dv\u011b m\u00edsta \u00faniku podobn\u00fdch informac\u00ed v algoritmu n\u00e1soben\u00ed: p\u0159i prov\u00e1d\u011bn\u00ed operac\u00ed vyhled\u00e1v\u00e1n\u00ed v tabulk\u00e1ch a v k\u00f3du podm\u00ednkov\u00e9ho vyta\u017een\u00ed dat na z\u00e1klad\u011b hodnoty posledn\u00edho bitu ve vektoru \u201enonce\u201c. Navzdory existenci v k\u00f3du Qualcomm opat\u0159en\u00ed proti \u00fanik\u016fm informac\u00ed p\u0159es vedlej\u0161\u00ed kan\u00e1ly umo\u017e\u0148uje navr\u017een\u00e1 metoda \u00fatoku obej\u00edt tato opat\u0159en\u00ed a ur\u010dit n\u011bkolik bit\u016f hodnoty \u201enonce\u201c, kter\u00e9 jsou dostate\u010dn\u00e9 k obnoven\u00ed 256bitov\u00fdch kl\u00ed\u010d\u016f ECDSA.<\/p>\n

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

Zdroj: 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\udd47Zranitelnost v \u010dipech Qualcomm, kter\u00e1 umo\u017e\u0148uje extrakci uzav\u0159en\u00fdch kl\u00ed\u010d\u016f z \u00falo\u017ei\u0161t\u011b TrustZone | ProHoster","description":"V\u00fdzkumn\u00edci ze spole\u010dnosti NCC Group odhalili podrobnosti 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