{"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\/es\/blog\/news\/novaya-tehnika-ataki-po-storonnim-kanalam-pozvolyayushhaya-vosstanovit-klyuchi-ecdsa","title":{"rendered":"Nueva t\u00e9cnica de ataque por canales secundarios que permite recuperar claves ECDSA","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Investigadores de la Universidad Masaryk revelaron<\/a><\/noindex> informaci\u00f3n sobre vulnerabilidades<\/a><\/noindex> en varias implementaciones del algoritmo de generaci\u00f3n de firmas digitales ECDSA\/EdDSA, que permiten recuperar el valor de la clave privada mediante el an\u00e1lisis de filtraciones de informaci\u00f3n sobre bits individuales que aparecen al aplicar m\u00e9todos de an\u00e1lisis a trav\u00e9s de canales auxiliares. Las vulnerabilidades han recibido el nombre en clave de Minerva. <\/p>\n

Los proyectos m\u00e1s conocidos que se ven afectados por el m\u00e9todo de ataque propuesto son OpenJDK\/OracleJDK (CVE-2019-2894) y la biblioteca Libgcrypt<\/a><\/noindex> (CVE-2019-13627), utilizada en GnuPG. Tambi\u00e9n est\u00e1n afectados 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> y las tarjetas inteligentes Athena IDProtect. No se han probado, pero tambi\u00e9n se han declarado como potencialmente vulnerables las tarjetas Valid S\/A IDflex V, SafeNet eToken 4300 y TecSec Armored Card, que utilizan un m\u00f3dulo est\u00e1ndar ECDSA. <\/p>\n

El problema ya ha sido solucionado en las versiones libgcrypt 1.8.5 y wolfCrypt 4.1.0, los dem\u00e1s proyectos a\u00fan no han lanzado actualizaciones. Se puede seguir la correcci\u00f3n de la vulnerabilidad en el paquete libgcrypt en las distribuciones en estas p\u00e1ginas: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, openSUSE\/SUSE<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

Vulnerabilidades no son vulnerables<\/a><\/noindex> OpenSSL, Botan, mbedTLS y BoringSSL. A\u00fan no se han probado Mozilla NSS, LibreSSL, Nettle, BearSSL, cryptlib, OpenSSL en modo FIPS, Microsoft .NET crypto,
\nlibkcapi del n\u00facleo de Linux, Sodium y GnuTLS.<\/p>\n

El problema es causado por la posibilidad de determinar los valores de bits individuales durante la multiplicaci\u00f3n escalar en operaciones con curvas el\u00edpticas. Se utilizan m\u00e9todos indirectos para extraer informaci\u00f3n sobre los bits, como la evaluaci\u00f3n de la latencia durante los c\u00e1lculos. Para el ataque, es necesario tener acceso no privilegiado al host donde se genera la firma digital (no se excluye<\/a><\/noindex> un ataque remoto, pero es mucho m\u00e1s complicado y requiere un gran volumen de datos para el an\u00e1lisis, por lo que puede considerarse poco probable). Para cargar est\u00e1 disponible<\/a><\/noindex> la herramienta utilizada para el ataque.<\/p>\n

A pesar del tama\u00f1o insignificante de la filtraci\u00f3n, para ECDSA es suficiente obtener incluso unos pocos bits de informaci\u00f3n sobre el vector de inicializaci\u00f3n (nonce) para llevar a cabo un ataque de recuperaci\u00f3n secuencial de toda la clave privada. Seg\u00fan los autores del m\u00e9todo, para una recuperaci\u00f3n exitosa de la clave, es suficiente analizar desde unos cientos hasta varios miles de firmas digitales generadas para mensajes conocidos por el atacante. Por ejemplo, para determinar la clave privada utilizada en la tarjeta inteligente Athena IDProtect basada en el chip Inside Secure AT90SC, se analizaron 11,000 firmas digitales utilizando la curva el\u00edptica secp256r1. El tiempo total del ataque fue de 30 minutos.<\/p>\n

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

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

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