{"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\/pl\/blog\/news\/v-openssh-dobavlena-zashhita-ot-atak-po-storonnim-kanalam","title":{"rendered":"W OpenSSH dodano ochron\u0119 przed atakami przez kana\u0142y boczne","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Damien Miller (djm @) doda\u0142<\/a><\/noindex> w OpenSSH wprowadzono usprawnienie, kt\u00f3re ma pom\u00f3c w obronie przed r\u00f3\u017cnymi atakami zewn\u0119trznymi, takimi jak Spectre, Meltdown<\/a><\/noindex>, RowHammer<\/a><\/noindex> i RAMBleed<\/a><\/noindex>. Dodana ochrona ma na celu zapobiegni\u0119cie odzyskiwaniu prywatnego klucza znajduj\u0105cego si\u0119 w pami\u0119ci operacyjnej poprzez wykorzystanie wyciek\u00f3w danych z kana\u0142\u00f3w bocznych.<\/p>\n

Istot\u0105 ochrony jest to, \u017ce klucze prywatne, w momentach, gdy nie s\u0105 u\u017cywane, s\u0105 szyfrowane za pomoc\u0105 klucza symetrycznego, kt\u00f3ry pochodzi z relatywnie du\u017cego \u201eklucza wst\u0119pnego\u201d (prekey) sk\u0142adaj\u0105cego si\u0119 z danych losowych (obecnie jego rozmiar wynosi 16 KB).
\nZ perspektywy realizacji, prywatne klucze s\u0105 szyfrowane podczas \u0142adowania do pami\u0119ci, a nast\u0119pnie automatycznie i przezroczysto odszyfrowywane przy u\u017cyciu do podpis\u00f3w lub podczas zapisywania\/serializacji.<\/p>\n

Aby przeprowadzi\u0107 skuteczny atak, napastnicy musz\u0105 z du\u017c\u0105 precyzj\u0105 odzyska\u0107 ca\u0142y prekey, zanim b\u0119d\u0105 mogli pr\u00f3bowa\u0107 odszyfrowa\u0107 zabezpieczony prywatny klucz. Jednak obecne pokolenie atak\u00f3w ma tak wysok\u0105 cz\u0119stotliwo\u015b\u0107 b\u0142\u0119d\u00f3w przy odzyskiwaniu bit\u00f3w, \u017ce suma tych b\u0142\u0119d\u00f3w czyni poprawne odzyskanie klucza wst\u0119pnego ma\u0142o prawdopodobnym.<\/p>\n

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

\u0179r\u00f3d\u0142o: 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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