{"id":38635,"date":"2019-10-31T22:24:58","date_gmt":"2019-10-31T19:24:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa\/"},"modified":"2019-10-31T22:24:58","modified_gmt":"2019-10-31T19:24:58","slug":"novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa","title":{"rendered":"Nov\u00e1 technika \u00fatoku p\u0159es bo\u010dn\u00ed kan\u00e1ly, umo\u017e\u0148uj\u00edc\u00ed obnovu kl\u00ed\u010d\u016f ECDSA","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdzkumn\u00edci z univerzity J. Masaryka odhalili<\/a><\/noindex> informace o zranitelnostech<\/a><\/noindex> v r\u016fzn\u00fdch implementac\u00edch algoritmu pro vytv\u00e1\u0159en\u00ed digit\u00e1ln\u00edho podpisu ECDSA\/EdDSA, kter\u00e9 umo\u017e\u0148uj\u00ed obnovit hodnotu soukrom\u00e9ho kl\u00ed\u010de na z\u00e1klad\u011b anal\u00fdzy \u00fanik\u016f informac\u00ed o jednotliv\u00fdch bitech, je\u017e se objevuj\u00ed p\u0159i pou\u017eit\u00ed metod anal\u00fdzy prost\u0159ednictv\u00edm postrann\u00edch kan\u00e1l\u016f. Zranitelnosti dostaly k\u00f3dov\u00e9 jm\u00e9no Minerva. <\/p>\n

Nejzn\u00e1m\u011bj\u0161\u00edmi projekty, kter\u00e9 se dot\u00fdk\u00e1 navrhovan\u00e1 metoda \u00fatoku, jsou OpenJDK\/OracleJDK (CVE-2019-2894) a knihovna Libgcrypt<\/a><\/noindex> (CVE-2019-13627), kter\u00e1 se pou\u017e\u00edv\u00e1 v GnuPG. Probl\u00e9mu tak\u00e9 podl\u00e9haj\u00ed MatrixSSL<\/a><\/noindex>, Crypto++<\/a><\/noindex>, wolfCrypt<\/a><\/noindex>, elliptic<\/a><\/noindex>, jsrsasign<\/a><\/noindex>, python-ecdsa<\/a><\/noindex>, ruby_ecdsa<\/a><\/noindex>, fastecdsa<\/a><\/noindex>, easy-ecc<\/a><\/noindex> a smart karty Athena IDProtect. Nebyly testov\u00e1ny, ale jako potenci\u00e1ln\u011b zraniteln\u00e9 byly tak\u00e9 uvedeny karty Valid S\/A IDflex V, SafeNet eToken 4300 a TecSec Armored Card, kter\u00e9 pou\u017e\u00edvaj\u00ed standardn\u00ed modul ECDSA. <\/p>\n

Probl\u00e9m ji\u017e byl vy\u0159e\u0161en ve verz\u00edch libgcrypt 1.8.5 a wolfCrypt 4.1.0, ostatn\u00ed projekty zat\u00edm nevydaly aktualizace. Sledovat opravu zranitelnosti v bal\u00ed\u010dku libgcrypt v distribuc\u00edch lze na t\u011bchto str\u00e1nk\u00e1ch: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, openSUSE\/SUSE<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

Zranitelnosti vystaven\u00fd<\/a><\/noindex> OpenSSL, Botan, mbedTLS a BoringSSL. Je\u0161t\u011b nebyly testov\u00e1ny Mozilla NSS, LibreSSL, Nettle, BearSSL, cryptlib, OpenSSL v re\u017eimu FIPS, Microsoft .NET crypto,
\nlibkcapi z j\u00e1dra Linuxu, Sodium a GnuTLS.<\/p>\n

Probl\u00e9m je zp\u016fsoben mo\u017enost\u00ed ur\u010dov\u00e1n\u00ed hodnot jednotliv\u00fdch bit\u016f b\u011bhem prov\u00e1d\u011bn\u00ed n\u00e1soben\u00ed skal\u00e1rem p\u0159i operac\u00edch s elliptickou k\u0159ivkou. Pro zji\u0161\u0165ov\u00e1n\u00ed informac\u00ed o bitech se pou\u017e\u00edvaj\u00ed nep\u0159\u00edm\u00e9 metody, jako je hodnocen\u00ed latence p\u0159i prov\u00e1d\u011bn\u00ed v\u00fdpo\u010dt\u016f. Pro \u00fatok je nutn\u00fd nediskrimina\u010dn\u00ed p\u0159\u00edstup k hostiteli, na kter\u00e9m se prov\u00e1d\u00ed generace digit\u00e1ln\u00edho podpisu (ne vylu\u010duje<\/a><\/noindex> a vzd\u00e1len\u00fd \u00fatok, ale ten je v\u00fdrazn\u011b zt\u00ed\u017een a vy\u017eaduje velk\u00e9 mno\u017estv\u00ed dat k anal\u00fdze, a proto m\u016f\u017ee b\u00fdt pova\u017eov\u00e1n za m\u00e1lo pravd\u011bpodobn\u00fd). Pro sta\u017een\u00ed je dostupn\u00e1<\/a><\/noindex> n\u00e1stroje pou\u017eit\u00e9 pro \u00fatok.<\/p>\n

I kdy\u017e je \u00fanik dat relativn\u011b mal\u00fd, pro ECDSA sta\u010d\u00ed k proveden\u00ed \u00fatoku na sekven\u010dn\u00ed obnovu cel\u00e9ho soukrom\u00e9ho kl\u00ed\u010de ur\u010dit n\u011bkolik bit\u016f s informacemi o inicializa\u010dn\u00edm vektoru (nonce). Podle tvrzen\u00ed autor\u016f metody je k \u00fasp\u011b\u0161n\u00e9mu obnoven\u00ed kl\u00ed\u010de pot\u0159eba analyzovat n\u011bkolik stovek a\u017e n\u011bkolik tis\u00edc digit\u00e1ln\u00edch podpis\u016f generovan\u00fdch pro \u00fato\u010dn\u00edkovi zn\u00e1m\u00e9 zpr\u00e1vy. Nap\u0159\u00edklad pro ur\u010den\u00ed soukrom\u00e9ho kl\u00ed\u010de pou\u017e\u00edvan\u00e9ho na smart kart\u011b Athena IDProtect s \u010dipem Inside Secure AT90SC, p\u0159i pou\u017eit\u00ed eliptick\u00e9 k\u0159ivky secp256r1 bylo analyzov\u00e1no 11 tis\u00edc digit\u00e1ln\u00edch podpis\u016f. Celkov\u00fd \u010das \u00fatoku \u010dinil 30 minut.<\/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 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0438\u043c. \u041c\u0430\u0441\u0430\u0440\u0438\u043a\u0430 \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u043f\u043e\u0434\u043f\u0438\u0441\u0438 ECDSA\/EdDSA, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0430\u0442\u043d\u043e\u0433\u043e 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\u043f\u0440\u043e\u0435\u043a\u0442\u0430\u043c\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438, \u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f OpenJDK\/OracleJDK (CVE-2019-2894) \u0438 […]<\/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-38635","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\udd47Nov\u00e1 technika \u00fatoku 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