{"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\/it\/blog\/novosti-interneta\/novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa","title":{"rendered":"Nuova tecnica di attacco tramite canali laterali, che consente di recuperare le chiavi ECDSA","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I ricercatori dell'Universit\u00e0 Masaryk hanno rivelato<\/a><\/noindex> informazioni su vulnerabilit\u00e0<\/a><\/noindex> in diverse implementazioni dell'algoritmo di creazione della firma digitale ECDSA\/EdDSA, che consentono di recuperare il valore della chiave privata basandosi sull'analisi delle informazioni che trapelano sui singoli bit, emergenti nell'uso di metodi di analisi tramite canali esterni. Le vulnerabilit\u00e0 hanno ricevuto il nome in codice Minerva. <\/p>\n

I progetti pi\u00f9 noti coinvolti dal metodo di attacco proposto includono OpenJDK\/OracleJDK (CVE-2019-2894) e la libreria Libgcrypt<\/a><\/noindex> (CVE-2019-13627), utilizzata in GnuPG. Anche 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> e le smart card Athena IDProtect. Non testati, ma segnalati come potenzialmente vulnerabili anche le carte Valid S\/A IDflex V, SafeNet eToken 4300 e TecSec Armored Card, che utilizzano il modulo standard ECDSA. <\/p>\n

Il problema \u00e8 gi\u00e0 stato risolto nelle versioni libgcrypt 1.8.5 e wolfCrypt 4.1.0, mentre gli altri progetti non hanno ancora rilasciato aggiornamenti. Puoi seguire la correzione della vulnerabilit\u00e0 nel pacchetto libgcrypt nelle distribuzioni su queste pagine: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, openSUSE\/SUSE<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

Vulnerabilit\u00e0 non sono vulnerabili<\/a><\/noindex> OpenSSL, Botan, mbedTLS e BoringSSL. Non sono ancora stati testati Mozilla NSS, LibreSSL, Nettle, BearSSL, cryptlib, OpenSSL in modalit\u00e0 FIPS, Microsoft .NET crypto,
\nlibkcapi dal kernel Linux, Sodium e GnuTLS.<\/p>\n

Il problema \u00e8 causato dalla possibilit\u00e0 di determinare i valori dei singoli bit durante l'esecuzione della moltiplicazione per uno scalare nelle operazioni con le curve ellittiche. Per estrarre informazioni sui bit vengono utilizzati metodi indiretti, come la valutazione del ritardo durante l'esecuzione dei calcoli. Per un attacco \u00e8 necessario avere accesso non privilegiato all'host su cui avviene la generazione della firma digitale (non escludendo<\/a><\/noindex> un attacco remoto, ma \u00e8 notevolmente complicato e richiede un grande volume di dati per l'analisi, quindi pu\u00f2 essere considerato poco probabile). Per caricare \u00e8 disponibile<\/a><\/noindex> il toolkit utilizzato per l'attacco.<\/p>\n

Nonostante la piccola entit\u00e0 della fuga di dati, per l'identificazione ECDSA bastano anche pochi bit di informazioni sul vettore di inizializzazione (nonce) per attuare un attacco di recupero sequenziale dell'intera chiave privata. Secondo gli autori del metodo, per un ripristino efficace della chiave \u00e8 sufficiente analizzare da alcune centinaia a diverse migliaia di firme digitali generate per messaggi noti all'attaccante. Ad esempio, per identificare la chiave privata utilizzata sulla smart card Athena IDProtect basata sul chip Inside Secure AT90SC, utilizzando la curva ellittica secp256r1, sono state analizzate 11.000 firme digitali. Il tempo totale dell'attacco \u00e8 stato di 30 minuti.<\/p>\n

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

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

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Le vulnerabilit\u00e0 sono state battezzate Minerva. I progetti pi\u00f9 noti colpiti dal metodo di attacco proposto includono OpenJDK\/OracleJDK (CVE-2019-2894) e","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041d\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0430\u0442\u0430\u043a\u0438 \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c, 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