{"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\/et\/blog\/news\/novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa","title":{"rendered":"Uus r\u00fcnnakutehnika k\u00fclgkanalite kaudu, mis v\u00f5imaldab taastada ECDSA v\u00f5tmeid","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Masariki \u00dclikooli teadlased avaldasid<\/a><\/noindex> teavet haavatavuste<\/a><\/noindex> kohta erinevates ECDSA\/EdDSA digitaalallkiri algoritmi rakendustes, mis v\u00f5imaldavad taastada privaatv\u00f5tme v\u00e4\u00e4rtust, anal\u00fc\u00fcsides lekitatud andmeid, mis ilmnevad teatud bittide osas k\u00fclgkanali anal\u00fc\u00fcsi meetodite rakendamisel. Haavatavused on saanud koodnimeks Minerva. <\/p>\n

Tuntuimad projektid, mida r\u00fcnnakutehnika puudutab, on OpenJDK\/OracleJDK (CVE-2019-2894) ja teek Libgcrypt<\/a><\/noindex> (CVE-2019-13627), mida kasutatakse GnuPG-s. Probleem on samuti seotud 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> ja Athena IDProtect nutikaardid. Katsetamata, kuid potentsiaalselt haavatavatena on ka mainitud kaardid Valid S\/A IDflex V, SafeNet eToken 4300 ja TecSec Armored Card, mis kasutavad ECDSA t\u00fc\u00fcpmoodulit. <\/p>\n

Probleem on juba lahendatud libgcrypt 1.8.5 ja wolfCrypt 4.1.0 versioonides, \u00fclej\u00e4\u00e4nud projektid pole veel v\u00e4rskendusi v\u00e4lja andnud. Libgcrypt haavatavuse parandamise j\u00e4lgimiseks saab vaadata j\u00e4rgmisi lehti: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, openSUSE\/SUSE<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

Haavatavused ei esine<\/a><\/noindex> OpenSSL, Botan, mbedTLS ja BoringSSL. Veel pole testitud Mozilla NSS, LibreSSL, Nettle, BearSSL, cryptlib, OpenSSL FIPS-re\u017eiimis, Microsoft .NET kr\u00fcpto,
\nlibkcapi Linuxi kernelist, Sodium ja GnuTLS.<\/p>\n

Probleem tuleneb v\u00f5imalusest m\u00e4\u00e4rata kindlaks teatud bitiv\u00e4\u00e4rtused, kui toimub skalaarselt korrutamine elliptilise k\u00f5vera operatsioonide k\u00e4igus. Bittide teabe eraldamiseks kasutatakse kaudseid meetodeid, nagu viivituse hindamine arvutuste k\u00e4igus. R\u00fcnnaku jaoks on vajalik privileege mitte omav juurdep\u00e4\u00e4s hostile, kus toimub digitaalallkirja genereerimine (ei ole v\u00e4listatud<\/a><\/noindex> ka kaug r\u00fcnnak, kuid see on tugevalt keeruline ja n\u00f5uab suurte andmemasside anal\u00fc\u00fcsimist, seet\u00f5ttu v\u00f5ib seda pidada ebat\u00f5en\u00e4oliseks). R\u00fcnnaku teostamiseks on olemas saadaval<\/a><\/noindex> kasutatav t\u00f6\u00f6riistakomplekt.<\/p>\n

Kuigi lekke suurus on v\u00e4ike, on ECDSA jaoks piisav, et m\u00e4\u00e4rata isegi m\u00f5ned bitid teavet initsialiseerimisvektorist (nonce), et teostada r\u00fcnnak kogu privaatse v\u00f5tme j\u00e4rjestikuseks taastamiseks. Meetodi autorite s\u00f5nul piisab v\u00f5tme edukaks taastamiseks anal\u00fc\u00fcsist, mis h\u00f5lmab mitusada kuni paar tuhat digitaalset allkirja, mis on genereeritud r\u00fcndajale tuttavate s\u00f5numite jaoks. N\u00e4iteks privaatse v\u00f5tme tuvastamiseks, mida kasutatakse Athena IDProtect nutikardil Inside Secure AT90SC kiibil, anal\u00fc\u00fcsiti 11 tuhat digitaalset allkirja, kasutades elliptilist k\u00f5verat secp256r1. R\u00fcnnaku koguaeg oli 30 minutit.<\/p>\n

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

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

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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\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\udd47Uus r\u00fcnnetehnika 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