{"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\/fr\/blog\/news\/v-openssh-dobavlena-zashhita-ot-atak-po-storonnim-kanalam","title":{"rendered":"OpenSSH a ajout\u00e9 une protection contre les attaques par canaux lat\u00e9raux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Damien Miller (djm @) a ajout\u00e9<\/a><\/noindex> dans OpenSSH, une am\u00e9lioration qui devrait aider \u00e0 se prot\u00e9ger contre diverses attaques par canaux auxiliaires, tels que Spectre, Meltdown<\/a><\/noindex>, RowHammer<\/a><\/noindex> et RAMBleed<\/a><\/noindex>. La protection ajout\u00e9e vise \u00e0 emp\u00eacher la r\u00e9cup\u00e9ration de la cl\u00e9 priv\u00e9e qui se trouve en m\u00e9moire, en exploitant des fuites de donn\u00e9es par canaux auxiliaires.<\/p>\n

Le principe de la protection est que les cl\u00e9s priv\u00e9es, lorsqu'elles ne sont pas utilis\u00e9es, sont crypt\u00e9es \u00e0 l'aide d'une cl\u00e9 sym\u00e9trique obtenue \u00e0 partir d'une \u00ab cl\u00e9 pr\u00e9liminaire \u00bb (prekey) relativement grande, compos\u00e9e de donn\u00e9es al\u00e9atoires (sa taille actuelle est de 16 Ko).
\nD'un point de vue impl\u00e9mentation, les cl\u00e9s priv\u00e9es sont chiffr\u00e9es lors de leur chargement en m\u00e9moire, puis sont automatiquement et de mani\u00e8re transparente d\u00e9chiffr\u00e9es lorsqu'elles sont utilis\u00e9es pour des signatures ou lorsqu'elles sont sauvegard\u00e9es\/s\u00e9rialis\u00e9es.<\/p>\n

Pour qu'une attaque r\u00e9ussisse, les attaquants doivent restaurer l'ensemble du prekey avec une grande pr\u00e9cision avant de pouvoir tenter de d\u00e9chiffrer la cl\u00e9 priv\u00e9e prot\u00e9g\u00e9e. Cependant, la g\u00e9n\u00e9ration actuelle d'attaques a un taux d'erreurs de r\u00e9cup\u00e9ration de bits tel que la combinaison de ces erreurs rend peu probable la r\u00e9cup\u00e9ration correcte de la cl\u00e9 pr\u00e9liminaire.<\/p>\n

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

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

\u0414\u044d\u043c\u0438\u0435\u043d \u041c\u0438\u043b\u043b\u0435\u0440 (djm @) \u0434\u043e\u0431\u0430\u0432\u0438\u043b \u0432 OpenSSH \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0434\u043e\u043b\u0436\u043d\u043e \u043f\u043e\u043c\u043e\u0447\u044c \u0437\u0430\u0449\u0438\u0442\u0438\u0442\u044c \u043e\u0442 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0430\u0442\u0430\u043a \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c, \u0442\u0430\u043a\u0438\u043c \u043a\u0430\u043a Spectre, Meltdown, RowHammer \u0438 RAMBleed. \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043d\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u043f\u0440\u0438\u0437\u0432\u0430\u043d\u0430 \u043f\u0440\u0435\u0434\u043e\u0442\u0432\u0440\u0430\u0442\u0438\u0442\u044c \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 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