{"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\/et\/blog\/novosti-interneta\/realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh","title":{"rendered":"Intel'i kiipides DDIO rakendamine v\u00f5imaldab teatud m\u00e4\u00e4ral v\u00f5rgu r\u00fcnnakut SSH seansi klahvivajutuste registreerimise kaudu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Amsterdami Vaba \u00dclikooli ja Z\u00fcrichi Tehnika\u00fclikooli teadlaste r\u00fchm on v\u00e4lja t\u00f6\u00f6tanud neti r\u00fcnnetehnika <noindex><a rel=\"nofollow\" href=\"https:\/\/www.vusec.net\/projects\/netcat\/\">NetCAT<\/a><\/noindex> (Network Cache ATtack), mis v\u00f5imaldab, kasutades andmeanal\u00fc\u00fcsi meetodeid kolmandate osapoolte kanalite kaudu, kaugelt kindlaks teha, milliseid klahve kasutaja SSH sessioonis vajutab. Probleem ilmneb ainult serverites, kus kasutatakse tehnoloogiaid <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Remote_direct_memory_access\">RDMA<\/a><\/noindex> (Remote direct memory access) ja <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\">peab<\/a><\/noindex>, mist\u00f5ttu on r\u00fcnnaku elluviimine praktikas keeruline, kuna see n\u00f5uab r\u00fcndaja juurdep\u00e4\u00e4su kohalikule v\u00f5rgule, steriilseid tingimusi ja hostide \u00fchendamise korraldamist RDMA ja DDIO tehnoloogiate kaudu, mida tavaliselt kasutatakse isoleeritud v\u00f5rkudes, n\u00e4iteks arvutiklastrites. Probleemile on antud madal ohuhinnang (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>) ja soovitus mitte lubada DDIO ja RDMA-d kohalikes v\u00f5rkudes, kus ei ole tagatud turvapiirang ja usaldusv\u00e4\u00e4rsete klientide \u00fchendamine. DDIO-d rakendatakse Intel'i serveriprotsessorites alates 2012. aastast (Intel Xeon E5, E7 ja SP). AMD ja teiste tootjate protsessorite p\u00f5hised s\u00fcsteemid ei ole probleemile vastuv\u00f5tlikud, kuna need ei toeta v\u00f5rgus edastatavate andmete salvestamist CPU vahem\u00e4lus.<\/p>\n<p>R\u00fcnnakumeetod sarnaneb n\u00f5rkuse \u201e<noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48591\">Throwhammer<\/a><\/noindex>\u201e, mis v\u00f5imaldab muuta individuaalsete bitide sisu RAM-is, tehes v\u00f5rgu paketiga manipuleerimist RDMA s\u00fcsteemides. Uus probleem tuleneb pingete v\u00e4hendamise t\u00f6\u00f6dest, kasutades DDIO mehhanismi, mis v\u00f5imaldab otse\u00fchendust v\u00f5rkaartide ja teiste perifeerseadmete ning protsessori vahem\u00e4lu vahel (\u00fctleme, et v\u00f5rgu kaardiga t\u00f6\u00f6tlemise k\u00e4igus salvestatakse andmed vahem\u00e4llu ja need tuuakse sealt v\u00e4lja, ilma et p\u00f6\u00f6rdutaks m\u00e4llu).<\/p>\n<p>DDIO t\u00f5ttu j\u00f5uavad vahem\u00e4lusse kaandmed, mis on genereeritud pahatahtliku v\u00f5rgutegevuse k\u00e4igus. NetCAT r\u00fcnnak tugineb sellele, et v\u00f5rgukaardid salvestavad andmeid aktiivselt vahem\u00e4llu ja pakettide t\u00f6\u00f6tlemise kiirus kaasaegsetes kohalikest v\u00f5rkudes on piisav, et m\u00f5jutada vahem\u00e4lu t\u00e4itumist ning m\u00e4\u00e4rata andmete olemasolu v\u00f5i puudumise vahem\u00e4lus andmeid edastamise viivituste anal\u00fc\u00fcsi kaudu. <\/p>\n<p>Interaktiivsete sessioonide, n\u00e4iteks SSH kaudu, kasutamise korral saadetakse v\u00f5rgu pakett kohe p\u00e4rast n\u00e4ppimist, st paketide vahelised viivitused korreleeruvad n\u00e4ppimise vaheliste viivitustega. Kasutades statistilise anal\u00fc\u00fcsi meetodeid ja arvestades, et n\u00e4pistuste vahelised viivitused s\u00f5ltuvad tavaliselt klahvi asukohast klaviatuuril, on kindla t\u00f5en\u00e4osusega v\u00f5imalik taastada sisestatud teave. N\u00e4iteks, enamik inimesi tavaliselt kirjutab \u201es\u201d p\u00e4rast \u201ea\u201d m\u00e4rgatavalt kiiremini kui \u201eg\u201d p\u00e4rast \u201es\u201d.<\/p>\n<p>Protsessori vahem\u00e4lu salvestatud teave v\u00f5imaldab ka kindlaks teha pakettide t\u00e4pset aega, mis saadetakse v\u00f5rgukaardi poolt selliste \u00fchenduste t\u00f6\u00f6tlemise ajal nagu SSH. Teatud liiklust genereerides saab r\u00fcndaja m\u00e4\u00e4rata, millal ilmuvad uued andmed vahem\u00e4llu, mis on seotud s\u00fcsteemis toimuva tegevusega. Vahem\u00e4lu sisu anal\u00fc\u00fcsimiseks kasutatakse meetodit  <noindex><a rel=\"nofollow\" href=\"http:\/\/ieeexplore.ieee.org\/document\/7363305\/\">Prime+Probe<\/a><\/noindex>, mis h\u00f5lmab vahem\u00e4lu t\u00e4itmist standardsete v\u00e4\u00e4rtuste komplektiga ja juurdep\u00e4\u00e4su aja m\u00f5\u00f5tmist nende uuesti t\u00e4itmise ajal muutuste m\u00e4\u00e4ramiseks. <\/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=\"Intel&#039;i kiipides DDIO rakendamine v\u00f5imaldab teatud m\u00e4\u00e4ral v\u00f5rgu r\u00fcnnakut SSH seansi klahvivajutuste registreerimise kaudu\" src=\"\/wp-content\/uploads\/2019\/09\/94cfe014f7db5a164cfbde4493290c61.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Ei v\u00e4listata, et pakutud tehnikat saab kasutada mitte ainult klahvivajutuste, vaid ka muude konfidentsiaalsete andmete kindlaksm\u00e4\u00e4ramiseks, mis salvestuvad CPU vahem\u00e4lus. Potentsiaalselt on r\u00fcnnakut v\u00f5imalik teostada ka RDMA v\u00e4lja l\u00fclitamisel, kuid ilma RDMA-ta on selle t\u00f5husus v\u00e4henenud ja teostamine on oluliselt keerulisem. Samuti on v\u00f5imalik kasutada DDIO-d peidetud suhtluse kanali korraldamiseks, mida kasutatakse andmete edastamiseks serveri kompromiteerimise j\u00e4rel turvameetmete v\u00e4ltimiseks.<\/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=\"Vaata videot\" 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>Allikas: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - 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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\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\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh\" \/>\n\t<meta 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\u043a\u043b\u0430\u0432\u0438\u0448 \u0432 \u0441\u0435\u0430\u043d\u0441\u0435 SSH | ProHoster\" \/>\n\t\t<meta property=\"og: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 \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, 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Probleem ilmneb ainult serverites, kus kasutatakse RDMA (Remote direct memory access) ja DDIO","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","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\u0420\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f DDIO \u0432 \u0447\u0438\u043f\u0430\u0445 Intel \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u0442 \u0441\u0435\u0442\u0435\u0432\u0443\u044e 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