{"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\/sk\/blog\/news\/uyazvimost-v-chipah-qualcomm-pozvolyayushhaya-izvlech-zakrytye-klyuchi-iz-hranilishha-trustzone","title":{"rendered":"Zranite\u013enos\u0165 v \u010dipoch Qualcomm, ktor\u00e1 umo\u017e\u0148uje extrahova\u0165 uzavret\u00e9 k\u013e\u00fa\u010de zo skladu TrustZone","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V\u00fdskumn\u00edci z firmy NCC Group <noindex><a rel=\"nofollow\" href=\"https:\/\/www.nccgroup.trust\/us\/our-research\/private-key-extraction-qualcomm-keystore\/\">odhalili<\/a><\/noindex> <noindex>podrobnosti<\/noindex> zranite\u013enosti (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.qualcomm.com\/company\/product-security\/bulletins#_CVE-2018-11976\">CVE-2018-11976<\/a><\/noindex>) v \u010dipoch Qualcomm, ktor\u00e1 umo\u017e\u0148uje ur\u010di\u0165 obsah uzavret\u00fdch \u0161ifrovac\u00edch k\u013e\u00fa\u010dov umiestnen\u00fdch v izolovanom enclave Qualcomm QSEE (Qualcomm Secure Execution Environment), zalo\u017eenom na technol\u00f3gii ARM TrustZone. Probl\u00e9m sa prejavuje v <noindex><a rel=\"nofollow\" href=\"https:\/\/www.qualcomm.com\/company\/product-security\/bulletins\">v\u00e4\u010d\u0161ine<\/a><\/noindex> SoC Snapdragon, ktor\u00e9 s\u00fa be\u017ene pou\u017e\u00edvan\u00e9 v smartf\u00f3noch na platforme Android. Opravy, ktor\u00e9 tento probl\u00e9m odstr\u00e1nia, u\u017e <noindex><a rel=\"nofollow\" href=\"https:\/\/source.android.com\/security\/bulletin\/2019-04-01\">samostatn\u00e9 metriky na hodnotenie v\u00fdsledkov testovania.<\/a><\/noindex> V apr\u00edlovom aktualiz\u00e1cii syst\u00e9mu Android a v nov\u00fdch vydaniach firmv\u00e9ru pre \u010dipy Qualcomm. Pr\u00edprava opravy zo strany spolo\u010dnosti Qualcomm trvala viac ako rok \u2014 p\u00f4vodne boli inform\u00e1cie o zranite\u013enosti zaslan\u00e9 spolo\u010dnosti Qualcomm u\u017e 19. marca 2018.<\/p>\n<p>Pripome\u0148me, \u017ee technol\u00f3gia ARM TrustZone umo\u017e\u0148uje vytv\u00e1ra\u0165 hardv\u00e9rovo izolovan\u00e9 bezpe\u010dn\u00e9 prostredia, ktor\u00e9 s\u00fa \u00faplne oddelen\u00e9 od hlavn\u00e9ho syst\u00e9mu a vykon\u00e1vaj\u00fa sa na samostatnom virtu\u00e1lnom procesore s pou\u017eit\u00edm samostatn\u00e9ho \u0161pecializovan\u00e9ho opera\u010dn\u00e9ho syst\u00e9mu. Hlavn\u00fdm \u00fa\u010delom TrustZone je zabezpe\u010di\u0165 izolovan\u00e9 vykon\u00e1vanie spracovate\u013eov \u0161ifrovac\u00edch k\u013e\u00fa\u010dov, biometrickej autentifik\u00e1cie, platobn\u00fdch \u00fadajov a in\u00fdch d\u00f4vern\u00fdch inform\u00e1ci\u00ed. Interakcia s hlavnou opera\u010dnou syst\u00e9mom prebieha nepriamo cez rozhranie spr\u00e1vy. Uzavret\u00e9 \u0161ifrovacie k\u013e\u00fa\u010de s\u00fa umiestnen\u00e9 vo vn\u00fatornom hardv\u00e9rovo izolovanom \u00falo\u017eisku k\u013e\u00fa\u010dov, \u010do pri spr\u00e1vnej implement\u00e1cii zabra\u0148uje ich \u00faniku v pr\u00edpade kompromit\u00e1cie hlavn\u00e9ho syst\u00e9mu.<\/p>\n<p>Zranite\u013enos\u0165 s\u00favis\u00ed s nedostatkom v implement\u00e1cii algoritmu spracovania eliptick\u00fdch kriviek, \u010do viedlo k \u00faniku inform\u00e1ci\u00ed o postupe spracovania \u00fadajov. V\u00fdskumn\u00edci vyvinuli techniku \u00fatoku prostredn\u00edctvom postrann\u00fdch kan\u00e1lov, ktor\u00e1 umo\u017e\u0148uje na z\u00e1klade existuj\u00facich nepriamych \u00fanikov obnovi\u0165 obsah uzavret\u00fdch k\u013e\u00fa\u010dov umiestnen\u00fdch v hardv\u00e9rovo izolovanom <noindex><a rel=\"nofollow\" href=\"https:\/\/developer.android.com\/training\/articles\/keystore.html\">Android Keystore<\/a><\/noindex>. \u00daniky s\u00fa ur\u010den\u00e9 na z\u00e1klade anal\u00fdzy aktiv\u00edt bloku predpovedania prechodov a zmien \u010dasu pr\u00edstupu k d\u00e1tam v pam\u00e4ti. Po\u010das experimentu vedci \u00faspe\u0161ne preuk\u00e1zali obnovu 224- a 256-bitov\u00fdch k\u013e\u00fa\u010dov ECDSA zo hardv\u00e9rovo izolovan\u00e9ho \u00falo\u017ei\u0161\u0165a k\u013e\u00fa\u010dov pou\u017e\u00edvan\u00e9ho v smartf\u00f3ne Nexus 5X. Na obnovu k\u013e\u00fa\u010da bolo potrebn\u00e9 vygenerova\u0165 pribli\u017ene 12 tis\u00edc digit\u00e1lnych podpisov, na \u010do sa minulo viac ako 14 hod\u00edn. Na vykonanie \u00fatoku bol pou\u017eit\u00fd n\u00e1strojov\u00fd bal\u00edk. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/nccgroup\/cachegrab\">Cachegrab<\/a><\/noindex>.<\/p>\n<p>Hlavnou pr\u00ed\u010dinou vzniku probl\u00e9mu je zdie\u013eanie spolo\u010dn\u00fdch hardv\u00e9rov\u00fdch komponentov a cache pre v\u00fdpo\u010dty v TrustZone a v hlavnom syst\u00e9me \u2014 izol\u00e1cia je vykonan\u00e1 na \u00farovni logick\u00e9ho delenia, ale s vyu\u017eit\u00edm spolo\u010dn\u00fdch v\u00fdpo\u010dtov\u00fdch blokov a so zaznamen\u00e1van\u00edm st\u00f4p v\u00fdpo\u010dtov a inform\u00e1ci\u00ed o adres\u00e1ch prechodu v spolo\u010dnej procesorovej cache. Pomocou met\u00f3dy Prime+Probe, zalo\u017eenej na hodnoten\u00ed zmien pr\u00edstupov\u00e9ho \u010dasu k uchovan\u00fdm inform\u00e1ci\u00e1m, je mo\u017en\u00e9 dosiahnu\u0165 vysok\u00fa presnos\u0165 sledovania tokov \u00fadajov a znakov vykon\u00e1vania k\u00f3du s\u00favisiaceho s v\u00fdpo\u010dtami digit\u00e1lnych podpisov v TrustZone prostredn\u00edctvom kontroly pr\u00edtomnosti ur\u010dit\u00fdch vzorov v cache.  <\/p>\n<p>Ve\u013ek\u00e1 \u010das\u0165 \u010dasu potrebn\u00e9ho na vytvorenie digit\u00e1lneho podpisu s pou\u017eit\u00edm ECDSA k\u013e\u00fa\u010dov v \u010dipoch Qualcomm sa vynaklad\u00e1 na vykon\u00e1vanie oper\u00e1ci\u00ed n\u00e1sobenia v slu\u010dke s pou\u017eit\u00edm nezmenen\u00e9ho vektora inicializ\u00e1cie pre ka\u017ed\u00fd podpis (<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Nonce\">nonce<\/a><\/noindex>). Ak \u00fato\u010dn\u00edk dok\u00e1\u017ee obnovi\u0165 aspo\u0148 nieko\u013eko bitov inform\u00e1ci\u00ed o tomto vektore, vznik\u00e1 mo\u017enos\u0165 uskuto\u010dni\u0165 \u00fatok na sekven\u010dn\u00e9 obnovenie cel\u00e9ho s\u00fakromn\u00e9ho k\u013e\u00fa\u010da. <\/p>\n<p>V pr\u00edpade s Qualcommom boli zisten\u00e9 dve miesta \u00faniku podobn\u00fdch inform\u00e1ci\u00ed v algoritme n\u00e1sobenia: pri vykon\u00e1van\u00ed oper\u00e1ci\u00ed vyh\u013ead\u00e1vania v tabu\u013ek\u00e1ch a v k\u00f3de podmienen\u00e9ho extrahovania \u00fadajov na z\u00e1klade hodnoty posledn\u00e9ho bitu vo vektore \u201enonce\u201c. Napriek pr\u00edtomnosti opatren\u00ed v k\u00f3de Qualcomm na zamedzenie \u00fanikom inform\u00e1ci\u00ed prostredn\u00edctvom ved\u013eaj\u0161\u00edch kan\u00e1lov umo\u017e\u0148uje navrhnut\u00e1 met\u00f3da \u00fatoku ob\u00eds\u0165 tieto opatrenia a ur\u010di\u0165 nieko\u013eko bitov hodnoty \u201enonce\u201c, \u010do sta\u010d\u00ed na obnovenie 256-bitov\u00fdch k\u013e\u00fa\u010dov ECDSA.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50572\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&hellip;]<\/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<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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