{"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\/it\/blog\/novosti-interneta\/v-openssh-dobavlena-zashhita-ot-atak-po-storonnim-kanalam","title":{"rendered":"In OpenSSH \u00e8 stata aggiunta una protezione contro attacchi tramite canali laterali","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Damien Miller (djm @) ho aggiunto<\/a><\/noindex> in OpenSSH, un miglioramento progettato per proteggere contro vari attacchi tramite canali laterali, come Spectre, Meltdown<\/a><\/noindex>, RowHammer<\/a><\/noindex> e RAMBleed<\/a><\/noindex>. La protezione aggiunta mira a prevenire il recupero della chiave privata in memoria sfruttando le perdite di dati attraverso canali laterali.<\/p>\n

Il principio della protezione \u00e8 che le chiavi private, nei momenti in cui non sono utilizzate, vengono criptate con una chiave simmetrica, ottenuta da una relativamente grande \u00abchiave preliminare\u00bb (prekey), composta da dati casuali (attualmente la sua dimensione \u00e8 di 16 KB).
\nDal punto di vista dell'implementazione, le chiavi private sono criptate al caricamento in memoria e quindi vengono automaticamente e trasparentemente decriptate quando utilizzate per le firme o per la loro conservazione\/serializzazione.<\/p>\n

Per un attacco riuscito, gli aggressori devono ripristinare l'intero prekey con un'alta precisione, prima di poter tentare di decriptare la chiave privata protetta. Tuttavia, l'attuale generazione di attacchi ha una tale frequenza di errori nel recupero dei bit che la combinazione di tali errori rende improbabile il corretto ripristino della chiave preliminare.<\/p>\n

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

Fonte: 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 \u043f\u0440\u0438\u0432\u0430\u0442\u043d\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430, \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0435\u0433\u043e\u0441\u044f \u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438, \u043f\u043e\u043b\u044c\u0437\u0443\u044f\u0441\u044c \u0443\u0442\u0435\u0447\u043a\u0430\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c. \u0421\u0443\u0442\u044c \u0437\u0430\u0449\u0438\u0442\u044b \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043f\u0440\u0438\u0432\u0430\u0442\u043d\u044b\u0435 \u043a\u043b\u044e\u0447\u0438, \u0432 \u043c\u043e\u043c\u0435\u043d\u0442\u044b, \u043a\u043e\u0433\u0434\u0430 \u043e\u043d\u0438 \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f, […]<\/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-novosti-interneta"],"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\udd47A OpenSSH \u00e8 stata aggiunta protezione contro gli attacchi attraverso canali laterali | ProHoster","description":"D\u00e9mien Miller (djm @) ha aggiunto a OpenSSH un miglioramento che dovrebbe contribuire a proteggere da vari attacchi attraverso canali laterali, come Spectre, Meltdown, RowHammer e RAMBleed. La protezione aggiunta \u00e8 progettata per impedire il recupero della chiave privata che si trova nella memoria, sfruttando le perdite di dati attraverso canali laterali. L'essenza della protezione \u00e8 che le chiavi private, nei momenti in cui non vengono utilizzate,","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/v-openssh-dobavlena-zashhita-ot-atak-po-storonnim-kanalam","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\u0412 OpenSSH \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u0437\u0430\u0449\u0438\u0442\u0430 \u043e\u0442 \u0430\u0442\u0430\u043a \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c | 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