{"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\/novosti-interneta\/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 n\u00eb m\u00ebnyr\u00eb t\u00eb paracaktuar nj\u00eb sulm n\u00eb rrjet p\u00ebr regjistrimin e shtypjeve t\u00eb \u00e7el\u00ebsave n\u00eb seanc\u00ebn SSH.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nj\u00eb grup hulumtuesish nga Universiteti i Lir\u00eb i Amsterdamit dhe Politeknika Federale e Zyrihut zhvilluan nj\u00eb teknik\u00eb sulmi n\u00eb rrjet NetCAT<\/a><\/noindex> (Sulmi n\u00eb Kujtes\u00ebn e Rrjetit) q\u00eb, duke p\u00ebrdorur metoda t\u00eb analiz\u00ebs s\u00eb t\u00eb dh\u00ebnave p\u00ebrmes kanaleve an\u00ebsore, mund\u00ebson p\u00ebrcaktimin n\u00eb distanc\u00eb t\u00eb \u00e7el\u00ebsave q\u00eb p\u00ebrdoruesi shtyp gjat\u00eb pun\u00ebs n\u00eb nj\u00eb seanc\u00eb SSH. Problemi shfaqet vet\u00ebm n\u00eb servera q\u00eb p\u00ebrdorin teknologjit\u00eb RDMA<\/a><\/noindex> (Qasje e drejtp\u00ebrdrejt\u00eb n\u00eb memorje) dhe DDIO<\/a><\/noindex> (Input\/Output i drejtp\u00ebrdrejt\u00eb t\u00eb t\u00eb dh\u00ebnave).<\/p>\n

Kompania Intel beson<\/a><\/noindex>, \u00e7ka e b\u00ebn t\u00eb v\u00ebshtir\u00eb realizimin e sulmit n\u00eb praktik\u00eb, pasi k\u00ebrkon aksesin e sulmuesit n\u00eb rrjetin lokal, kushte sterile dhe organizimin e lidhjeve nd\u00ebrmjet hosteve duke p\u00ebrdorur teknologjit\u00eb RDMA dhe DDIO, t\u00eb cilat zakonisht p\u00ebrdoren n\u00eb rrjete t\u00eb izoluar, si ato n\u00eb t\u00eb cilat operojn\u00eb klasteret e kompjuter\u00ebve. Problemit i \u00ebsht\u00eb caktuar nj\u00eb nivel i vog\u00ebl rrezikshm\u00ebrie (CVSS 2.6, CVE-2019-11184<\/a><\/noindex>) dhe u dha rekomandimi q\u00eb t\u00eb mos p\u00ebrfshihen DDIO dhe RDMA n\u00eb rrjetet lokale ku nuk ofrohet nj\u00eb perimeter sigurie dhe lejohet lidhja e klient\u00ebve t\u00eb dyshimt\u00eb. DDIO aplikohet n\u00eb procesor\u00ebt e server\u00ebve Intel q\u00eb nga viti 2012 (Intel Xeon E5, E7 dhe SP). Sistemet mbi baz\u00ebn e procesor\u00ebve AMD dhe prodhuesve t\u00eb tjer\u00eb nuk jan\u00eb t\u00eb ekspozuara ndaj k\u00ebsaj problemi, pasi nuk mb\u00ebshtesin ruajtjen e t\u00eb dh\u00ebnave t\u00eb transmetuara p\u00ebrmes rrjetit n\u00eb cache t\u00eb CPU-s\u00eb.<\/p>\n

\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 «Throwhammer<\/a><\/noindex>«, \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

Me fal\u00ebnderimi i DDIO, n\u00eb cache-in e procesorit p\u00ebrfshihen gjithashtu t\u00eb dh\u00ebna q\u00eb jan\u00eb gjeneruar gjat\u00eb aktivitetit t\u00eb d\u00ebmsh\u00ebm n\u00eb rrjet. Sulmi NetCAT bazohen n\u00eb faktin se kartat rrjetit aktivisht e ruajn\u00eb t\u00eb dh\u00ebnat, dhe shpejt\u00ebsia e p\u00ebrpunimit t\u00eb paketeve n\u00eb rrjetet moderne lokale \u00ebsht\u00eb e mjaftueshme p\u00ebr t\u00eb ndikuar n\u00eb mbushjen e cache-it dhe p\u00ebr t\u00eb p\u00ebrcaktuar n\u00ebse t\u00eb dh\u00ebnat jan\u00eb ose jo n\u00eb cache p\u00ebrmes analiz\u00ebs s\u00eb vonesave gjat\u00eb transmetimit t\u00eb t\u00eb dh\u00ebnave. <\/p>\n

\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 «s» \u043f\u043e\u0441\u043b\u0435 «a» \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0431\u044b\u0441\u0442\u0440\u0435\u0435, \u0447\u0435\u043c «g» \u043f\u043e\u0441\u043b\u0435 «s».<\/p>\n

Informacioni q\u00eb akumulohet n\u00eb caches-in e procesorit gjithashtu lejon t\u00eb gjykohet koha e sakt\u00eb e paketave t\u00eb d\u00ebrguara nga karta rrjetit gjat\u00eb p\u00ebrpunimit t\u00eb lidhjeve si SSH. Duke gjeneruar nj\u00eb trafik t\u00eb caktuar, 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 aktivitet t\u00eb caktuar n\u00eb sistem. P\u00ebr analiz\u00ebn e p\u00ebrmbajtjes s\u00eb caches p\u00ebrdoret metoda Prime+Probe<\/a><\/noindex>, q\u00eb parashikon mbushjen e caches me nj\u00eb set referencash dhe matjen e koh\u00ebs s\u00eb aksesit ndaj tyre gjat\u00eb mbushjes s\u00eb p\u00ebrs\u00ebritur p\u00ebr t\u00eb p\u00ebrcaktuar ndryshimet. <\/p>\n

\"Implementimi<\/a><\/noindex><\/center><\/p>\n

Nuk p\u00ebrjashtohet p\u00ebrdorimi i teknik\u00ebs s\u00eb propozuar p\u00ebr t\u00eb p\u00ebrcaktuar jo vet\u00ebm goditjet e tastier\u00ebs, por edhe lloje t\u00eb tjera t\u00eb dh\u00ebnash konfidenciale, q\u00eb akumulohen n\u00eb cache-in e CPU. Potencialisht, sulmi mund t\u00eb realizohet edhe kur RDMA \u00ebsht\u00eb i \u00e7aktivizuar, por pa RDMA, efikasiteti zvog\u00eblohet dhe ekzekutimi b\u00ebhet ndjesh\u00ebm m\u00eb i komplikuar. Gjithashtu, \u00ebsht\u00eb e mundur t\u00eb p\u00ebrdoret DDIO p\u00ebr organizimin e nj\u00eb kanali t\u00eb fsheht\u00eb t\u00eb komunikimit, i cili p\u00ebrdoret p\u00ebr t\u00eb transmetuar t\u00eb dh\u00ebna pas kompromiseve t\u00eb serverit, duke anashkaluar sistemet p\u00ebr mbrojtjen e siguris\u00eb.<\/p>\n

\r\n \"Luaj\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

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

Burimi: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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