{"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\/sq\/blog\/news\/realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh","title":{"rendered":"Implementimi i DDIO n\u00eb \u00e7ipat Intel lejon nj\u00eb sulm rrjetor q\u00eb definon shtypjet e \u00e7el\u00ebsave gjat\u00eb nj\u00eb seance SSH.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nj\u00eb grup hulumtuesish nga Universiteteve t\u00eb Lira t\u00eb Amsterdamit dhe Shkolla Suprem\u00eb Teknike e Zvicr\u00ebs n\u00eb Cyrih ka zhvilluar nj\u00eb teknik\u00eb sulmi rrjetor. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.vusec.net\/projects\/netcat\/\">NetCAT<\/a><\/noindex> (Network Cache ATtack), e cila lejon, duke p\u00ebrdorur metoda t\u00eb analiz\u00ebs s\u00eb t\u00eb dh\u00ebnave p\u00ebr kanale t\u00eb treta, t\u00eb p\u00ebrcaktoj\u00eb n\u00eb m\u00ebnyr\u00eb t\u00eb larg\u00ebt \u00e7el\u00ebsat q\u00eb shtyp p\u00ebrdoruesi gjat\u00eb pun\u00ebs n\u00eb nj\u00eb seanc\u00eb SSH. Problemi shfaqet vet\u00ebm n\u00eb server\u00ebt q\u00eb p\u00ebrdorin teknologjit\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Remote_direct_memory_access\">RDMA<\/a><\/noindex> (Remote direct memory access) dhe <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Direct_memory_access#DDIO\">DDIO<\/a><\/noindex> (Data-Direct I\/O).<\/p>\n<p>Kompania Intel  <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/insights\/more-information-netcat\">beson<\/a><\/noindex>, q\u00eb sulmi \u00ebsht\u00eb i v\u00ebshtir\u00eb p\u00ebr t'u realizuar n\u00eb praktik\u00eb, sepse k\u00ebrkon qasje t\u00eb sulmuesit n\u00eb rrjetin lokal, kushte sterile dhe organizimin e lidhjeve t\u00eb hosteve duke p\u00ebrdorur teknologjit\u00eb RDMA dhe DDIO, t\u00eb cilat zakonisht p\u00ebrdoren n\u00eb rrjete t\u00eb izoluar, si ato q\u00eb funksionojn\u00eb me klaster\u00eb kompjuterik\u00eb. Problemit i \u00ebsht\u00eb akorduar nj\u00eb nivel i vog\u00ebl rreziku (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>) dhe \u00ebsht\u00eb rekomanduar q\u00eb t\u00eb mos p\u00ebrfshihet DDIO dhe RDMA n\u00eb rrjetet lokale ku nuk sigurohet nj\u00eb perimetrim sigurie dhe lejohet lidhja me klient\u00eb t\u00eb pa besuesh\u00ebm. DDIO p\u00ebrdoret n\u00eb procesor\u00ebt e server\u00ebve Intel, duke filluar nga viti 2012 (Intel Xeon E5, E7 dhe SP). Sistemet e bazuara n\u00eb procesor\u00ebt AMD dhe prodhuesit e tjer\u00eb nuk jan\u00eb t\u00eb ndjesh\u00ebm ndaj problemit, pasi nuk mb\u00ebshtesin ruajtjen e t\u00eb dh\u00ebnave t\u00eb d\u00ebrguara p\u00ebrmes rrjetit n\u00eb cache-n e 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>Fal\u00eb DDIO, n\u00eb cache-n e procesorit hyjn\u00eb gjithashtu t\u00eb dh\u00ebna t\u00eb generuara gjat\u00eb aktivitetit t\u00eb d\u00ebmsh\u00ebm rrjetor. Sulmi NetCAT bazohet n\u00eb iden\u00eb se kartat rrjetore aktivisht ruajn\u00eb t\u00eb dh\u00ebna n\u00eb cache, dhe shpejt\u00ebsia e p\u00ebrpunimit t\u00eb paketave n\u00eb rrjetet lokale moderne \u00ebsht\u00eb e mjaftueshme p\u00ebr t\u00eb ndikuar n\u00eb mbushjen e cache-it dhe p\u00ebr t\u00eb p\u00ebrcaktuar pranin\u00eb apo munges\u00ebn e t\u00eb dh\u00ebnave n\u00eb cache p\u00ebrmes analiz\u00ebs s\u00eb vonesave gjat\u00eb transferimit t\u00eb t\u00eb dh\u00ebnave. <\/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>Informacioni q\u00eb mbetet n\u00eb cache-n\u00eb e procesorit lejon gjithashtu t\u00eb gjykohet n\u00eb lidhje me koh\u00ebn e sakt\u00eb t\u00eb paketave t\u00eb d\u00ebrguara nga karta rrjeti gjat\u00eb p\u00ebrpunimit t\u00eb lidhjeve si SSH. Duke gjeneruar nj\u00eb fluks t\u00eb caktuar trafiku, sulmuesi mund t\u00eb p\u00ebrcaktoj\u00eb momentin e shfaqjes s\u00eb t\u00eb dh\u00ebnave t\u00eb reja n\u00eb cache, t\u00eb lidhura me aktivitetin e caktuar n\u00eb sistem. Metoda p\u00ebr analizimin e p\u00ebrmbajtjes s\u00eb cache-it \u00ebsht\u00eb  <noindex><a rel=\"nofollow\" href=\"http:\/\/ieeexplore.ieee.org\/document\/7363305\/\">Prime+Probe<\/a><\/noindex>, e cila parashikon mbushjen e cache-it me nj\u00eb grup referencash dhe matjen e koh\u00ebs s\u00eb qasjes ndaj tyre gjat\u00eb mbushjes s\u00eb p\u00ebrs\u00ebritur p\u00ebr t\u00eb p\u00ebrcaktuar ndryshimet. <\/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=\"Implementimi i DDIO n\u00eb \u00e7ipat Intel lejon nj\u00eb sulm rrjetor q\u00eb definon shtypjet e \u00e7el\u00ebsave gjat\u00eb nj\u00eb seance SSH.\" src=\"\/wp-content\/uploads\/2019\/09\/94cfe014f7db5a164cfbde4493290c61.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Nuk p\u00ebrjashtohet p\u00ebrdorimi i teknik\u00ebs s\u00eb propozuar p\u00ebr t\u00eb p\u00ebrcaktuar jo vet\u00ebm shtypjet e \u00e7el\u00ebsave, por edhe lloje t\u00eb tjera t\u00eb t\u00eb dh\u00ebnave t\u00eb ndjeshme q\u00eb mbeten n\u00eb cache-n\u00eb e CPU-s\u00eb. Potencialisht sulmi mund t\u00eb zhvillohet edhe kur RDMA \u00ebsht\u00eb i \u00e7aktivizuar, por pa RDMA, efikasiteti i saj reduktohet, dhe ekzekutimi b\u00ebhet ndjesh\u00ebm m\u00eb i komplikuar. Gjithashtu, \u00ebsht\u00eb e mundur t\u00eb p\u00ebrdoret DDIO p\u00ebr t\u00eb organizuar nj\u00eb kanal t\u00eb fsheht\u00eb komunikimi, i p\u00ebrdorur p\u00ebr transferimin e t\u00eb dh\u00ebnave pas komprometimit t\u00eb serverit p\u00ebr t\u00eb anashkaluar sistemet e siguris\u00eb.<\/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=\"Luaj videon\" 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>Burimi: <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 5.0.1.1 - 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 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