{"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\/novosti-interneta\/novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa","title":{"rendered":"Uus r\u00fcnnetehnika kolmandate osapoolte kanalite kaudu, mis v\u00f5imaldab taastada ECDSA v\u00f5tmeid","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Masaryki \u00fclikooli teadlased <noindex><a rel=\"nofollow\" href=\"https:\/\/seclists.org\/oss-sec\/2019\/q4\/3\">avalikustas<\/a><\/noindex> teave <noindex><a rel=\"nofollow\" href=\"https:\/\/minerva.crocs.fi.muni.cz\/\">haavatavustest<\/a><\/noindex> eri ECDSA\/EdDSA digitaalsete allkirjade loomise algoritmide rakendustes, mis v\u00f5imaldavad erav\u00f5tme v\u00e4\u00e4rtuse taastamist, anal\u00fc\u00fcsides individuaalsete bitide kohta lekkinud teavet, mis ilmneb k\u00f5rvalkanalite anal\u00fc\u00fcsimeetodite kasutamise ajal. Haavatavused said koodimeheks Minerva. <\/p>\n<p>Tuntuimad projektid, mida pakutud r\u00fcnnakumeetod m\u00f5jutab, on OpenJDK\/OracleJDK (CVE-2019-2894) ja teek <noindex><a rel=\"nofollow\" href=\"https:\/\/git.gnupg.org\/cgi-bin\/gitweb.cgi?p=libgcrypt.git\">Libgcrypt<\/a><\/noindex> (CVE-2019-13627), mida kasutatakse GnuPG-s. Probleem on samuti haavatav <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/matrixssl\/matrixssl\/\">MatrixSSL<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/weidai11\/cryptopp\/\">Crypto++<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/wolfSSL\/wolfssl\/\">wolfCrypt<\/a><\/noindex>,   <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/indutny\/elliptic\/\">elliptic<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/kjur\/jsrsasign\">jsrsasign<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/warner\/python-ecdsa\">python-ecdsa<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/DavidEGrayson\/ruby_ecdsa\">ruby_ecdsa<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/AntonKueltz\/fastecdsa\">fastecdsa<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/esxgx\/easy-ecc\/\">easy-ecc<\/a><\/noindex> ja Athena IDProtecti nutikardid. Testimata, kuid potentsiaalselt haavatavana on v\u00e4lja toodud ka Valid S\/A IDflex V, SafeNet eToken 4300 ja TecSec Armored Card, mis kasutavad standardset ECDSA moodulit. <\/p>\n<p>Probleem on juba lahendatud libgcrypti 1.8.5 ja wolfCrypti 4.1.0 versioonides, teised projektid pole veel v\u00e4rskendusi v\u00e4lja andnud. Haavatavuse parandamise j\u00e4lgimiseks libgcrypti paketis distributsioonides saab vaadata neid lehek\u00fclgi: <noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2019-13627\">Debian<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/people.canonical.com\/~ubuntu-security\/cve\/2019\/CVE-2019-13627.html\">Ubuntu<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.redhat.com\/show_bug.cgi?id=CVE-2019-13627\">RHEL<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/bodhi.fedoraproject.org\/updates\/?releases=F30&#038;type=security\">Fedora<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.suse.com\/show_bug.cgi?id=CVE-2019-13627\">openSUSE\/SUSE<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"http:\/\/www.vuxml.org\/freebsd\/\">FreeBSD<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/security.archlinux.org\/CVE-2019-13627\">Arch<\/a><\/noindex>.<\/p>\n<p>Haavatavused <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/crocs-muni\/ECTester\/blob\/master\/docs\/LIBS.md\">ei ole haavatavad<\/a><\/noindex> OpenSSL, Botan, mbedTLS ja BoringSSL. Veel ei ole testitud Mozilla NSS, LibreSSL, Nettle, BearSSL, cryptlib, OpenSSL FIPSi re\u017eiimis, Microsoft .NET crypto,<br \/>\nlibkcapi Linuxi Kernelist, Sodium ja GnuTLS.<\/p>\n<p>Probleem tuleneb v\u00f5imalusest m\u00e4\u00e4rata \u00fcksikute bittide v\u00e4\u00e4rtusi skalaari korrutamise ajal elliptilise k\u00f5veraga toimingute k\u00e4igus. Bittide teabe eristamiseks kasutatakse kaudseid meetodeid, nagu arvutuste k\u00e4igus tekkiva viivituse hindamine. R\u00fcnnakuks on vajalik privileegeteta juurdep\u00e4\u00e4s hostile, kus digitaalallkirja genereerimine toimub (ei <noindex><a rel=\"nofollow\" href=\"https:\/\/minerva.crocs.fi.muni.cz\/#remote\">tohiks v\u00e4listada<\/a><\/noindex> ja kaugr\u00fcnnak, kuid see on oluliselt keerulisem ja n\u00f5uab suurt andmemahtu anal\u00fc\u00fcsimiseks, seega v\u00f5ib seda pidada ebat\u00f5en\u00e4oliseks). R\u00fcnnakuks vajalik tarkvara laadimiseks <noindex><a rel=\"nofollow\" href=\"https:\/\/minerva.crocs.fi.muni.cz\/#poc\">saadaval<\/a><\/noindex> kasutatud t\u00f6\u00f6riist.<\/p>\n<p>Kuigi lekke suurus on v\u00e4ike, on ECDSA v\u00f5tme m\u00e4\u00e4ramiseks piisav isegi vaid m\u00f5ne biti teavitava algusvektori (nonce) teave, et teostada j\u00e4rjestikune taastamise r\u00fcnnak kogu privaatv\u00f5tme vastu. Meetodi autorite s\u00f5nul on v\u00f5tme eduka taastamise jaoks piisav anal\u00fc\u00fcs paarisaja kuni paarituhande digitaalse allkirja kohta, mis on genereeritud r\u00fcndajale tuntud s\u00f5numite jaoks. N\u00e4iteks Athena IDProtect nutikaardil, mis p\u00f5hineb Inside Secure AT90SC kiibil ja kasutab elliptilist k\u00f5verat secp256r1, anal\u00fc\u00fcsiti salajase v\u00f5tme m\u00e4\u00e4ramiseks 11 tuhat digitaalsest allkirjast. R\u00fcnnaku kogukestus oli 30 minutit.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51609\">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 \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 \u043a\u043b\u044e\u0447\u0430 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0430\u043d\u0430\u043b\u0438\u0437\u0430 \u0443\u0442\u0435\u0447\u0435\u043a \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u0439 \u043e\u0431 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0431\u0438\u0442\u0430\u0445, \u0432\u0441\u043f\u043b\u044b\u0432\u0430\u044e\u0449\u0438\u0445 \u043f\u0440\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0430\u043d\u0430\u043b\u0438\u0437\u0430 \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0438 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Minerva. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u043c\u0438 \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 [&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-38635","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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