{"id":38012,"date":"2019-10-31T22:21:11","date_gmt":"2019-10-31T19:21:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh\/"},"modified":"2019-10-31T22:21:11","modified_gmt":"2019-10-31T19:21:11","slug":"realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh","title":{"rendered":"Implementeringen av DDIO i Intel-chips m\u00f6jligg\u00f6r ett n\u00e4tverksangrepp som i grunden kan identifiera tangenttryckningar i en SSH-session","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>En grupp forskare fr\u00e5n VU Amsterdam och ETH Z\u00fcrich har utvecklat en n\u00e4tverksattackteknik <noindex><a rel=\"nofollow\" href=\"https:\/\/www.vusec.net\/projects\/netcat\/\">NetCAT<\/a><\/noindex> (Network Cache ATtack), vilket g\u00f6r det m\u00f6jligt att avl\u00e4sa de tangenter som anv\u00e4ndaren trycker p\u00e5 under en SSH-session genom att anv\u00e4nda dataanalysmetoder via externa kanaler. Problemet uppst\u00e5r endast p\u00e5 servrar som anv\u00e4nder teknologier som <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Remote_direct_memory_access\">RDMA<\/a><\/noindex> (Remote direct memory access) och <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Direct_memory_access#DDIO\">DDIO<\/a><\/noindex> (Data-Direct I\/O).<\/p>\n<p>Intel  <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/insights\/more-information-netcat\">anser<\/a><\/noindex>, vilket g\u00f6r att attacken \u00e4r sv\u00e5r att genomf\u00f6ra i praktiken, eftersom den kr\u00e4ver att angriparen har tillg\u00e5ng till det lokala n\u00e4tverket, sterila f\u00f6rh\u00e5llanden och en uppkoppling mellan v\u00e4rdar med hj\u00e4lp av teknologierna RDMA och DDIO, som vanligtvis anv\u00e4nds i isolerade n\u00e4tverk, till exempel i ber\u00e4kningskluster. Problemet har tilldelats en obetydlig riskniv\u00e5 (CVSS 2.6, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/security-center\/advisory\/intel-sa-00290.html\">CVE-2019-11184<\/a><\/noindex>) och det rekommenderas att inte aktivera DDIO och RDMA i lokala n\u00e4tverk d\u00e4r s\u00e4kerhetsperimeter inte uppr\u00e4tth\u00e5lls och obeh\u00f6riga klienter f\u00e5r ansluta. DDIO anv\u00e4nds i serverprocessorer fr\u00e5n Intel sedan 2012 (Intel Xeon E5, E7 och SP). System som baseras p\u00e5 AMD-processorer och andra tillverkare \u00e4r inte p\u00e5verkade av problemet, eftersom de inte st\u00f6der cachning av n\u00e4tverksdata i CPU.<\/p>\n<p>\u041f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0439 \u0434\u043b\u044f \u0430\u0442\u0430\u043a\u0438 \u043c\u0435\u0442\u043e\u0434 \u043d\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u0435\u0442 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48591\">Throwhammer<\/a><\/noindex>&#171;, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e  \u0438\u0437\u043c\u0435\u043d\u044f\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0431\u0438\u0442\u043e\u0432 \u0432 \u041e\u0417\u0423 \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u044e \u0441 \u0441\u0435\u0442\u0435\u0432\u044b\u043c\u0438 \u043f\u0430\u043a\u0435\u0442\u0430\u043c\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 RDMA. \u041d\u043e\u0432\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435\u043c  \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043c\u0438\u043d\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u0437\u0430\u0434\u0435\u0440\u0436\u0435\u043a \u043f\u0440\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 DDIO, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u043f\u0440\u044f\u043c\u043e\u0435 \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435 \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u043a\u0430\u0440\u0442\u044b \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0435\u0440\u0438\u0444\u0435\u0440\u0438\u0439\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0441 \u043a\u044d\u0448\u0435\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430 (\u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u043a\u0430\u0440\u0442\u044b, \u0434\u0430\u043d\u043d\u044b\u0435 \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u044e\u0442\u0441\u044f \u0432 \u043a\u044d\u0448 \u0438 \u0438\u0437\u0432\u043b\u0435\u043a\u0430\u044e\u0442\u0441\u044f \u0438\u0437 \u043a\u044d\u0448\u0430, \u0431\u0435\u0437 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u043a \u043f\u0430\u043c\u044f\u0442\u0438).<\/p>\n<p>Tack vare DDIO n\u00e5r ocks\u00e5 data som genereras under skadlig n\u00e4tverksaktivitet CPU-cachen. NetCAT-attacken bygger p\u00e5 att n\u00e4tverkskort aktivt cachar data, och hastigheten f\u00f6r paketbehandling i moderna lokala n\u00e4tverk \u00e4r tillr\u00e4cklig f\u00f6r att p\u00e5verka cache-fyllning och avg\u00f6ra om data finns i cachen eller inte genom att analysera latens vid data\u00f6verf\u00f6ring. <\/p>\n<p>\u041f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0438\u043d\u0442\u0435\u0440\u0430\u043a\u0442\u0438\u0432\u043d\u044b\u0445 \u0441\u0435\u0430\u043d\u0441\u043e\u0432, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440 \u0447\u0435\u0440\u0435\u0437 SSH, \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u043f\u0430\u043a\u0435\u0442 \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0435\u043f\u043e\u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u043f\u043e\u0441\u043b\u0435 \u043d\u0430\u0436\u0430\u0442\u0438\u044f \u043a\u043b\u0430\u0432\u0438\u0448\u0438, \u0442.\u0435. \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043c\u0435\u0436\u0434\u0443 \u043f\u0430\u043a\u0435\u0442\u0430\u043c\u0438 \u043a\u043e\u0440\u0440\u0435\u043b\u0438\u0440\u0443\u044e\u0442 \u0441 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0430\u043c\u0438 \u043c\u0435\u0436\u0434\u0443 \u043d\u0430\u0436\u0430\u0442\u0438\u044f\u043c\u0438 \u043a\u043b\u0430\u0432\u0438\u0448. \u0418\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u043c\u0435\u0442\u043e\u0434\u044b \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0430\u043d\u0430\u043b\u0438\u0437\u0430 \u0438 \u0443\u0447\u0438\u0442\u044b\u0432\u0430\u044f, \u0447\u0442\u043e \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043c\u0435\u0436\u0434\u0443 \u043d\u0430\u0436\u0430\u0442\u0438\u044f\u043c\u0438 \u043e\u0431\u044b\u0447\u043d\u043e \u0437\u0430\u0432\u0438\u0441\u044f\u0442 \u043e\u0442 \u043f\u043e\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u043a\u043b\u0430\u0432\u0438\u0448\u0438 \u043d\u0430 \u043a\u043b\u0430\u0432\u0438\u0430\u0442\u0443\u0440\u0435, \u043c\u043e\u0436\u043d\u043e \u0441 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0432\u0435\u0440\u043e\u044f\u0442\u043d\u043e\u0441\u0442\u044c\u044e \u0432\u043e\u0441\u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u0432\u0432\u043e\u0434\u0438\u043c\u0443\u044e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e \u043b\u044e\u0434\u0435\u0439 \u043e\u0431\u044b\u0447\u043d\u043e \u043d\u0430\u0431\u0438\u0440\u0430\u044e\u0442 &#171;s&#187; \u043f\u043e\u0441\u043b\u0435 &#171;a&#187; \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0431\u044b\u0441\u0442\u0440\u0435\u0435, \u0447\u0435\u043c &#171;g&#187; \u043f\u043e\u0441\u043b\u0435 &#171;s&#187;.<\/p>\n<p>Den information som s\u00e4tter sig i processorcacheminnet m\u00f6jligg\u00f6r ocks\u00e5 bed\u00f6mning av exakt tid f\u00f6r paket som skickas av n\u00e4tverkskortet vid bearbetning av s\u00e5dana anslutningar som SSH. Genom att generera en viss trafikstr\u00f6m kan en angripare avg\u00f6ra n\u00e4r nya data visas i cachen, relaterade till specifik aktivitet i systemet. F\u00f6r att analysera cacheinneh\u00e5llet anv\u00e4nds metoden  <noindex><a rel=\"nofollow\" href=\"http:\/\/ieeexplore.ieee.org\/document\/7363305\/\">Prime+Probe<\/a><\/noindex>, vilket inneb\u00e4r att cachen fylls med en referensupps\u00e4ttning av v\u00e4rden och att \u00e5tkomsttiden till dem m\u00e4ts vid omfyllning f\u00f6r att best\u00e4mma f\u00f6r\u00e4ndringar. <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.vusec.net\/wp-content\/uploads\/2019\/09\/pasted-image-0-2-1.png\"><img decoding=\"async\" alt=\"Implementeringen av DDIO i Intel-chips m\u00f6jligg\u00f6r ett n\u00e4tverksangrepp som i grunden kan identifiera tangenttryckningar i en SSH-session\" src=\"\/wp-content\/uploads\/2019\/09\/94cfe014f7db5a164cfbde4493290c61.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Det utesluts inte att den f\u00f6reslagna tekniken kan anv\u00e4ndas f\u00f6r att best\u00e4mma inte bara tangenttryckningar utan \u00e4ven andra typer av konfidentiella data som s\u00e4tter sig i CPU-cachen. Potentiellt kan attacken utf\u00f6ras \u00e4ven utan RDMA, men utan RDMA minskar dess effektivitet och utf\u00f6randet blir betydligt mer komplicerat. Det \u00e4r ocks\u00e5 m\u00f6jligt att anv\u00e4nda DDIO f\u00f6r att skapa en dold kommunikationskanal som anv\u00e4nds f\u00f6r att \u00f6verf\u00f6ra data efter att servern har komprometterats, f\u00f6rbi s\u00e4kerhetssystem.<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"QXut1XBymAk\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/QXut1XBymAk\/hqdefault.jpg\" alt=\"Spela video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51467\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0410\u043c\u0441\u0442\u0435\u0440\u0434\u0430\u043c\u0441\u043a\u043e\u0433\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0438 \u0428\u0432\u0435\u0439\u0446\u0430\u0440\u0441\u043a\u043e\u0439 \u0432\u044b\u0441\u0448\u0435\u0439 \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0448\u043a\u043e\u043b\u044b \u0426\u044e\u0440\u0438\u0445\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0430 \u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u0430\u0442\u0430\u043a\u0438 NetCAT (Network Cache ATtack), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044f \u043c\u0435\u0442\u043e\u0434\u044b \u0430\u043d\u0430\u043b\u0438\u0437\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c, \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0442\u044c \u043a\u043b\u0430\u0432\u0438\u0448\u0438, \u043d\u0430\u0436\u0438\u043c\u0430\u0435\u043c\u044b\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0440\u0430\u0431\u043e\u0442\u044b \u0432 \u0441\u0435\u0430\u043d\u0441\u0435 SSH. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0442\u0441\u044f \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 RDMA (Remote direct memory access) \u0438 DDIO [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":28530,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-38012","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0410\u043c\u0441\u0442\u0435\u0440\u0434\u0430\u043c\u0441\u043a\u043e\u0433\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0438 \u0428\u0432\u0435\u0439\u0446\u0430\u0440\u0441\u043a\u043e\u0439 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