{"id":35556,"date":"2019-10-31T22:04:59","date_gmt":"2019-10-31T19:04:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/v-openssh-dobavlena-zashhita-ot-atak-po-storonnim-kanalam\/"},"modified":"2019-10-31T22:04:59","modified_gmt":"2019-10-31T19:04:59","slug":"v-openssh-dobavlena-zashhita-ot-atak-po-storonnim-kanalam","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/v-openssh-dobavlena-zashhita-ot-atak-po-storonnim-kanalam","title":{"rendered":"Se ha a\u00f1adido protecci\u00f3n contra ataques a trav\u00e9s de canales paralelos en OpenSSH","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Damien Miller (djm @) a\u00f1adido<\/a><\/noindex> una mejora en OpenSSH que deber\u00eda ayudar a proteger contra varios ataques a trav\u00e9s de canales paralelos, como Spectre, Meltdown<\/a><\/noindex>, RowHammer<\/a><\/noindex> y RAMBleed<\/a><\/noindex>. La protecci\u00f3n a\u00f1adida est\u00e1 dise\u00f1ada para prevenir la recuperaci\u00f3n de la clave privada que reside en la memoria, aprovechando las filtraciones de datos a trav\u00e9s de canales paralelos.<\/p>\n

La esencia de la protecci\u00f3n radica en que las claves privadas, en los momentos en que no se utilizan, se cifran con una clave sim\u00e9trica, la cual se obtiene de una \"clave preliminar\" (prekey) relativamente grande, compuesta de datos aleatorios (actualmente su tama\u00f1o es de 16 KB).
\nDesde el punto de vista de la implementaci\u00f3n, las claves privadas se cifran al ser cargadas en la memoria, y luego se descifran autom\u00e1ticamente de manera transparente al utilizarse para firmas o al guardarse\/serializarse.<\/p>\n

Para llevar a cabo un ataque exitoso, los atacantes deben recuperar todo el prekey con alta precisi\u00f3n antes de poder intentar descifrar la clave privada protegida. Sin embargo, la generaci\u00f3n actual de ataques tiene una frecuencia de errores de recuperaci\u00f3n de bits tal que la combinaci\u00f3n de estos errores hace poco probable la recuperaci\u00f3n correcta de la clave preliminar.<\/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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[…]<\/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-35556","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\udd47 Se ha a\u00f1adido protecci\u00f3n contra ataques a trav\u00e9s de canales paralelos en OpenSSH | ProHoster","description":"Damien Miller (djm @) a\u00f1adi\u00f3 una mejora en OpenSSH que deber\u00eda ayudar a proteger contra varios ataques a trav\u00e9s de canales 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