{"id":35693,"date":"2019-10-31T22:05:48","date_gmt":"2019-10-31T19:05:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-amd-sev-pozvolyayushhaya-opredelit-klyuchi-shifrovaniya\/"},"modified":"2019-10-31T22:05:48","modified_gmt":"2019-10-31T19:05:48","slug":"uyazvimost-v-amd-sev-pozvolyayushhaya-opredelit-klyuchi-shifrovaniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/novosti-interneta\/uyazvimost-v-amd-sev-pozvolyayushhaya-opredelit-klyuchi-shifrovaniya","title":{"rendered":"Nj\u00eb dob\u00ebsi n\u00eb AMD SEV, e cila lejon identifikimin e \u00e7elsave t\u00eb enkriptimit","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Zhvilluesit nga ekipi Google Cloud identifikuan<\/a><\/noindex> nj\u00eb dob\u00ebsi (CVE-2019-9836) n\u00eb implementimin e teknologjis\u00eb AMD SEV (Virtualizimi i Enkriptuar Sigurt), e cila mund t\u00eb komprometoj\u00eb t\u00eb dh\u00ebnat e mbrojtura me k\u00ebt\u00eb teknologji. AMD SEV ofron enkriptimin transparent t\u00eb memories s\u00eb makinave virtuale n\u00eb nivelin harduerik, ku vet\u00ebm sistemi aktual mik mund t\u00eb ket\u00eb qasje n\u00eb t\u00eb dh\u00ebnat e \u00e7elura, nd\u00ebrsa makinat e tjera virtuale dhe hipervizori, kur p\u00ebrpiqen t\u00eb qasen n\u00eb k\u00ebt\u00eb memorie, marrin nj\u00eb grup t\u00eb dh\u00ebnash t\u00eb enkriptuara.<\/p>\n

Problemi i zbuluar mund\u00ebson rikuperimin e plot\u00eb t\u00eb p\u00ebrmbajtjes s\u00eb \u00e7el\u00ebsit PDH t\u00eb mbyllur, i cili p\u00ebrpunohet n\u00eb nivelin e nj\u00eb procesori t\u00eb mbrojtur PSP (Procesori i Siguris\u00eb AMD), i pap\u00ebrfshir\u00eb p\u00ebr sistemin kryesor operativ.
\nDuke pasur \u00e7el\u00ebsin PDH, sulmuesi mund t\u00eb rikuperoj\u00eb \u00e7el\u00ebsin e sesionit dhe sekuenc\u00ebn sekrete, t\u00eb caktuar gjat\u00eb krijimit t\u00eb makin\u00ebs virtuale, dhe t\u00eb fitoj\u00eb qasje n\u00eb t\u00eb dh\u00ebnat e enkriptuara. <\/p>\n

Dob\u00ebsia shkaktohet nga mang\u00ebsit\u00eb n\u00eb implementimin e kurbave eliptike (ECC), t\u00eb cilat p\u00ebrdoren p\u00ebr enkriptimin dhe q\u00eb lejojn\u00eb nj\u00eb sulm<\/a><\/noindex> p\u00ebr rivendosjen e parametrave t\u00eb kurb\u00ebs. Gjat\u00eb ekzekutimit t\u00eb komand\u00ebs p\u00ebr aktivizimin e makineris\u00eb virtuale t\u00eb mbrojtur, sulmuesi mund t\u00eb d\u00ebrgoj\u00eb parametra t\u00eb kurb\u00ebs q\u00eb nuk i p\u00ebrkasin atyre t\u00eb rekomanduara nga NIST, gj\u00eb q\u00eb do t\u00eb \u00e7oj\u00eb n\u00eb p\u00ebrdorimin e vlerave t\u00eb pikave me rend t\u00eb ul\u00ebt n\u00eb operacionet e shumzimit me t\u00eb dh\u00ebnat e \u00e7el\u00ebsit privat. <\/p>\n

Siguria e protokollit ECDH \u00ebsht\u00eb doh\u00ebn\u00eb<\/a><\/noindex> nga rendit<\/a><\/noindex> t\u00eb pik\u00ebs fillestare t\u00eb kurb\u00ebs, p\u00ebr t\u00eb cil\u00ebn logaritmi disket \u00ebsht\u00eb nj\u00eb detyr\u00eb shum\u00eb e komplikuar. N\u00eb nj\u00eb nga hapat e inicializimit t\u00eb mjedisit AMD SEV, n\u00eb llogaritjet me \u00e7el\u00ebsin privat p\u00ebrdoren parametra t\u00eb marr\u00eb nga p\u00ebrdoruesi. N\u00eb thelb, kryhet nj\u00eb operacion shumzimi i dy pikave, nj\u00ebra prej t\u00eb cilave i p\u00ebrgjigjet \u00e7el\u00ebsit privat. N\u00ebse pika e dyt\u00eb i p\u00ebrket numrave t\u00eb thjesht\u00eb me rend t\u00eb ul\u00ebt, sulmuesi mund t\u00eb p\u00ebrcaktoj\u00eb parametrat e pik\u00ebs s\u00eb par\u00eb (bit\u00ebt e modulit q\u00eb p\u00ebrdoren n\u00eb operacionin e ngritjes n\u00eb fuqi modulo) p\u00ebrmes prov\u00ebs s\u00eb t\u00eb gjitha vlerave t\u00eb mundshme. P\u00ebr t\u00eb p\u00ebrcaktuar \u00e7el\u00ebsin privat, fragmentet e numrave t\u00eb thjesht\u00eb t\u00eb p\u00ebrshtatur mund t\u00eb kombinohen s\u00eb bashku me Teorem\u00ebn e Kin\u00ebs p\u00ebr mbetje<\/a><\/noindex>.<\/p>\n

Platforma t\u00eb server\u00ebve AMD EPYC, t\u00eb cilat p\u00ebrdorin firmware SEV deri prej versionit 0.17 build 11, kan\u00eb qen\u00eb t\u00eb ekspozuara ndaj problemeve. Kompania AMD tashm\u00eb publikoi<\/noindex> ka publikuar nj\u00eb p\u00ebrdit\u00ebsim firmware, q\u00eb p\u00ebrfshin ndalimin e p\u00ebrdorimit t\u00eb pikave q\u00eb nuk i p\u00ebrmbushin kurb\u00ebn NIST. Megjithat\u00eb, certifikatat e gjeneruara m\u00eb par\u00eb p\u00ebr \u00e7el\u00ebsat PDH mbeten valide, duke lejuar nj\u00eb sulmues t\u00eb kryej\u00eb nj\u00eb sulm migrimi t\u00eb makinave virtuale nga mjediset e mbrojtura nga vulnerabiliteti n\u00eb mjedise t\u00eb ekspozuara ndaj problemit. Po ashtu, p\u00ebrmendet mund\u00ebsia e kryerjes s\u00eb nj\u00eb sulmi me r\u00ebnien n\u00eb versionin e vjet\u00ebr t\u00eb firmware-it q\u00eb \u00ebsht\u00eb i vulneruesh\u00ebm, por kjo mund\u00ebsi akoma nuk \u00ebsht\u00eb konfirmuar.<\/p>\n

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

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

\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0438\u0437 \u043a\u043e\u043c\u0430\u043d\u0434\u044b Google Cloud \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-9836) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 AMD SEV (Secure Encrypted Virtualization), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u044b\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0434\u0430\u043d\u043d\u043e\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0435. 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