{"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\/de\/blog\/news\/v-openssh-dobavlena-zashhita-ot-atak-po-storonnim-kanalam","title":{"rendered":"In OpenSSH wurde der Schutz gegen Angriffe \u00fcber externe Kan\u00e4le hinzugef\u00fcgt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Damien Miller (djm @) hinzugef\u00fcgt<\/a><\/noindex> in OpenSSH eine Verbesserung, die dazu beitragen soll, vor verschiedenen seitlichen Angriffen zu sch\u00fctzen, wie zum Beispiel Spectre, Meltdown<\/a><\/noindex>, RowHammer<\/a><\/noindex> und RAMBleed<\/a><\/noindex>. Der hinzugef\u00fcgte Schutz soll verhindern, dass der private Schl\u00fcssel, der sich im Arbeitsspeicher befindet, durch Datenlecks \u00fcber seitliche Kan\u00e4le wiederhergestellt wird.<\/p>\n

Der Kern des Schutzes besteht darin, dass die privaten Schl\u00fcssel, wenn sie nicht verwendet werden, mit einem symmetrischen Schl\u00fcssel verschl\u00fcsselt werden, der aus einem relativ gro\u00dfen \u201eVorkey\u201c (prekey) gewonnen wird, der aus Zufallsdaten besteht (aktuell hat er eine Gr\u00f6\u00dfe von 16 KB).
\nAus implementierungstechnischer Sicht werden die privaten Schl\u00fcssel beim Laden in den Speicher verschl\u00fcsselt und dann automatisch und transparent entschl\u00fcsselt, wenn sie f\u00fcr Signaturen verwendet oder gespeichert\/serialisiert werden.<\/p>\n

Um erfolgreich anzugreifen, m\u00fcssen Angreifer den gesamten prekey mit hoher Genauigkeit wiederherstellen, bevor sie versuchen k\u00f6nnen, den gesch\u00fctzten privaten Schl\u00fcssel zu entschl\u00fcsseln. Die derzeitigen Angriffsgenerationen haben jedoch eine solche Fehlerquote bei der Wiederherstellung von Bits, dass die Summe dieser Fehler eine korrekte Wiederherstellung des Vorkeys unwahrscheinlich macht.<\/p>\n

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

Quelle: 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\udd47Schutz vor seitlichen Angriffe in OpenSSH hinzugef\u00fcgt | ProHoster","description":"Damien Miller (djm @) hat in OpenSSH eine Verbesserung hinzugef\u00fcgt, die dazu beitragen soll, vor verschiedenen seitlichen Angriffen zu 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