{"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\/hu\/blog\/news\/novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa","title":{"rendered":"\u00daj, harmadik f\u00e9l csatorn\u00e1in t\u00f6rt\u00e9n\u0151 t\u00e1mad\u00e1si technika, amely lehet\u0151v\u00e9 teszi az ECDSA kulcsok helyre\u00e1ll\u00edt\u00e1s\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Masaryk-i Egyetem kutat\u00f3i felfedt\u00e9k<\/a><\/noindex> inform\u00e1ci\u00f3k a sebezhet\u0151s\u00e9gekr\u0151l<\/a><\/noindex> az ECDSA\/EdDSA digit\u00e1lis al\u00e1\u00edr\u00e1s l\u00e9trehoz\u00e1s\u00e1nak k\u00fcl\u00f6nb\u00f6z\u0151 megval\u00f3s\u00edt\u00e1saiban, amelyek lehet\u0151v\u00e9 teszik a priv\u00e1t kulcs \u00e9rt\u00e9k\u00e9nek helyre\u00e1ll\u00edt\u00e1s\u00e1t egyes bitek inform\u00e1ci\u00f3inak elemz\u00e9se alapj\u00e1n, amelyek a mell\u00e9kcsatorn\u00e1s elemz\u00e9si m\u00f3dszerek alkalmaz\u00e1sakor felt\u00e1r\u00f3dnak. A sebezhet\u0151s\u00e9geket Minerva k\u00f3dn\u00e9ven ismert\u00e9k. <\/p>\n

A legjobban ismert projektek, amelyeket a javasolt t\u00e1mad\u00e1si m\u00f3dszer \u00e9rint, az OpenJDK\/OracleJDK (CVE-2019-2894) \u00e9s a Libgcrypt<\/a><\/noindex> (CVE-2019-13627), amelyet a GnuPG haszn\u00e1l. A probl\u00e9ma szint\u00e9n \u00e9rinti a MatrixSSL<\/a><\/noindex>, Crypto++<\/a><\/noindex>, wolfCrypt<\/a><\/noindex>, elliptikus<\/a><\/noindex>, jsrsasign<\/a><\/noindex>, python-ecdsa<\/a><\/noindex>, ruby_ecdsa<\/a><\/noindex>, fastecdsa<\/a><\/noindex>, easy-ecc<\/a><\/noindex> \u00e9s az Athena IDProtect okosk\u00e1rty\u00e1k. Nem tesztelt\u00e9k, de potenci\u00e1lisan sebezhet\u0151k\u00e9nt \u00e9rinti \u0151ket a Valid S\/A IDflex V, SafeNet eToken 4300 \u00e9s TecSec Armored Card, amelyek ECDSA mintamodult haszn\u00e1lnak. <\/p>\n

A probl\u00e9m\u00e1t m\u00e1r megoldott\u00e1k a libgcrypt 1.8.5 \u00e9s wolfCrypt 4.1.0 kiad\u00e1sokban, a t\u00f6bbi projekt m\u00e9g nem k\u00e9sz\u00edtette el a friss\u00edt\u00e9seket. A libgcrypt csomag sebezhet\u0151s\u00e9g\u00e9nek jav\u00edt\u00e1s\u00e1t a disztrib\u00faci\u00f3kban az al\u00e1bbi oldalakon lehet nyomon k\u00f6vetni: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, openSUSE\/SUSE<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

Vulnerabilities mivel az Exim nem szerepel a hivatalos csomagrep\u00f3j\u00e1ban (sz\u00fcks\u00e9g eset\u00e9n az<\/a><\/noindex> OpenSSL, Botan, mbedTLS \u00e9s BoringSSL. A Mozilla NSS, LibreSSL, Nettle, BearSSL, cryptlib, OpenSSL FIPS \u00fczemm\u00f3dban, Microsoft .NET kriptogr\u00e1fia,
\nlibkcapi a Linux kernelt\u0151l, Sodium \u00e9s GnuTLS m\u00e9g nem tesztelt\u00e9k.<\/p>\n

A probl\u00e9ma a bitek \u00e9rt\u00e9keinek meghat\u00e1roz\u00e1s\u00e1nak lehet\u0151s\u00e9g\u00e9b\u0151l ad\u00f3dik elliptikus g\u00f6rb\u00e9vel t\u00f6rt\u00e9n\u0151 sk\u00e1l\u00e1ris szorz\u00e1s k\u00f6zben. A bitek inform\u00e1ci\u00f3inak kiemel\u00e9s\u00e9re k\u00f6zvetett m\u00f3dszereket haszn\u00e1lnak, p\u00e9ld\u00e1ul a sz\u00e1m\u00edt\u00e1sok v\u00e9grehajt\u00e1sakor tapasztalt k\u00e9sleked\u00e9s \u00e9rt\u00e9kel\u00e9s\u00e9t. A t\u00e1mad\u00e1shoz nem privilegiz\u00e1lt hozz\u00e1f\u00e9r\u00e9s sz\u00fcks\u00e9ges ahhoz a hoszthoz, amelyen a digit\u00e1lis al\u00e1\u00edr\u00e1s gener\u00e1l\u00e1s\u00e1ra ker\u00fcl sor (nem kiz\u00e1rt<\/a><\/noindex> a t\u00e1voli t\u00e1mad\u00e1s, de az jelent\u0151sen bonyolultabb \u00e9s nagy mennyis\u00e9g\u0171 adatot ig\u00e9nyel az elemz\u00e9shez, ez\u00e9rt val\u00f3sz\u00edn\u0171tlennek tekinthet\u0151). A t\u00e1mad\u00e1shoz haszn\u00e1lt eszk\u00f6z\u00f6k let\u00f6lt\u00e9s\u00e9re el\u00e9rhet\u0151<\/a><\/noindex> sz\u00e1ml\u00e1l\u00f3zva.<\/p>\n

B\u00e1r a sziv\u00e1rg\u00e1s m\u00e9rete csek\u00e9ly, az ECDSA kulcs teljes helyre\u00e1ll\u00edt\u00e1s\u00e1hoz elegend\u0151 n\u00e9h\u00e1ny bitnyi inform\u00e1ci\u00f3 az inicializ\u00e1l\u00f3 vektorr\u00f3l (nonce). A m\u00f3dszer szerz\u0151i szerint a kulcs sikeres helyre\u00e1ll\u00edt\u00e1s\u00e1hoz elegend\u0151 n\u00e9h\u00e1ny sz\u00e1z vagy ak\u00e1r t\u00f6bb ezer digit\u00e1lis al\u00e1\u00edr\u00e1s elemz\u00e9se, amelyet a t\u00e1mad\u00f3 \u00e1ltal ismert \u00fczenetekhez gener\u00e1ltak. P\u00e9ld\u00e1ul, az Athena IDProtect okosk\u00e1rty\u00e1n, amely az Inside Secure AT90SC chipre \u00e9p\u00fcl, a secp256r1 elliptikus g\u00f6rb\u00e9t haszn\u00e1lva 11 ezer digit\u00e1lis al\u00e1\u00edr\u00e1st elemeztek a titkos kulcs meghat\u00e1roz\u00e1s\u00e1hoz. A t\u00e1mad\u00e1s \u00f6sszes\u00edtett id\u0151tartama 30 perc volt.<\/p>\n

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

Forr\u00e1s: 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\udd47\u00daj mell\u00e9kcsatorn\u00e1s 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