{"id":100636,"date":"2021-06-30T22:23:10","date_gmt":"2021-06-30T20:23:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-speczifichnom-dlya-cpu-amd-kode-kvm-pozvolyayushhaya-vypolnit-kod-vne-gostevoj-sistemy"},"modified":"2021-06-30T22:23:10","modified_gmt":"2021-06-30T20:23:10","slug":"uyazvimost-v-speczifichnom-dlya-cpu-amd-kode-kvm-pozvolyayushhaya-vypolnit-kod-vne-gostevoj-sistemy","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-speczifichnom-dlya-cpu-amd-kode-kvm-pozvolyayushhaya-vypolnit-kod-vne-gostevoj-sistemy","title":{"rendered":"Haavatavus AMD spetsiifilises KVM koodis, mis v\u00f5imaldab k\u00e4ivitada koodi k\u00fclalis s\u00fcsteemi v\u00e4ljaspool","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Google Project Zero meeskonna teadlased on tuvastanud haavatavuse (CVE-2021-29657) Linuxi tuumaga kaasas olevas KVM h\u00fcperviisorisse, mis v\u00f5imaldab r\u00fcnnata k\u00fclalistootes\u00fcsteemi isolatsiooni ja k\u00e4ivitada enda koodi host-\u00fcmbruses. Probleem esineb AMD protsessoritega s\u00fcsteemide koodis (kvm-amd.ko moodul) ja ei avaldu Intel protsessorites. <\/p>\n

Uurijad on valmistanud ette t\u00f6\u00f6protot\u00fc\u00fcbi exploit'ist, mis v\u00f5imaldab k\u00fclastuskeskkonnast k\u00e4ivitada root shell'i host-keskkonnas s\u00fcsteemis, millel on AMD Epyc 7351P protsessor ja Linux 5.10 kernel. T\u00f5detakse, et see on esimene \"guest-to-host\" klassi haavatavus h\u00fcperviisorises endas. KVM<\/a>, mis ei ole seotud kasutaja ruumi komponentide, nagu QEMU, vigadega. Parandus v\u00f5eti tuuma sisse m\u00e4rtsi l\u00f5pus. Probleem ilmneb Linuxi tuuma versioonis 5.10-rc1 kuni v5.12-rc6, st see h\u00f5lmab ainult tuuma 5.10 ja 5.11 (enamik stabiilseid jaotuse harusid ei puudutatud). <\/p>\n

Probleem tuleneb nested_svm_vmrun mehhanismist, mis on ellu viidud AMD SVM (Secure Virtual Machine) laienduse abil ja v\u00f5imaldab korraldada k\u00fclaliss\u00fcsteemide sisemist k\u00e4ivitamist. Selle funktsionaalsuse korrektseks rakendamiseks peab h\u00fcperviisorit olema v\u00f5imeline p\u00fc\u00fcdma kinni k\u00f5ik SVM-i k\u00e4sud, mis t\u00e4idetakse k\u00fclaliss\u00fcsteemides, emuleerima nende k\u00e4itumist ja s\u00fcnkroniseerima olekut riistvaraga, mis on \u00fcsna keeruline \u00fclesanne. Uurijad anal\u00fc\u00fcsisid KVM-i elluviimist ja leidsid loogilise vea, mis v\u00f5imaldab m\u00f5jutada hosti MSR-register (Model-Specific Register) sisu k\u00fclaliss\u00fcsteemist, mida saab kasutada koodi k\u00e4ivitamiseks hosti tasemel. <\/p>\n

Eelk\u00f5ige p\u00f5hjustab VMRUN operatsiooni t\u00e4itmine teise taseme (L2), mis on k\u00e4ivitatud teisest k\u00fclalisest s\u00fcsteemist, teise kutsungiga nested_svm_vmrun ja m\u00f5jutab struktuuri svm->nested.hsave, kuhu k\u00e4tkevad andmed vmcb k\u00fclaliss\u00fcsteemist L2. Tulemus on selline, et k\u00fclaliss\u00fcsteemi L2 tasemel on v\u00f5imalik vabastada m\u00e4lu struktuuris svm->nested.msrpm, kus hoitakse MSR'i biti, kuigi seda kasutatakse endiselt, ning p\u00e4\u00e4seda host-keskkonna MSR'ile.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u0430\u043d\u0434\u044b Google Project Zero \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-29657) \u0432 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u044f\u0434\u0440\u0430 Linux \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 KVM, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u043e\u0431\u043e\u0439\u0442\u0438 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044e \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043a\u043e\u0434\u0435, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u043c \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u043c\u0438 AMD (\u043c\u043e\u0434\u0443\u043b\u044c kvm-amd.ko) \u0438 \u043d\u0435 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 Intel. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d \u0440\u0430\u0431\u043e\u0447\u0438\u0439 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0438\u0437 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0433\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100636","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47AMD protsessoritootjale spetsiifilist KVM koodi haavatavus, mis v\u00f5imaldab koodi k\u00e4itamist k\u00fclalisest s\u00fcsteemist v\u00e4ljaspool | ProHoster","description":"Google Project Zero meeskonna teadlased tuvastasid KVM h\u00fcperviisoris Linuxi tuumas (CVE-2021-29657) haavatavuse, mis v\u00f5imaldab k\u00fclalis\u00fcsteemide isolatsiooni \u00fcletamist ja oma koodi k\u00e4itamise host-\u00fcmbruses. Probleem esineb AMD protsessoritega s\u00fcsteemides (moodul kvm-amd.ko) ja ei ilmne Intel protsessorite puhul. Teadlased on v\u00e4lja t\u00f6\u00f6tanud t\u00f6\u00f6tava protot\u00fc\u00fcbi eksploitist, mis v\u00f5imaldab k\u00fclalisest","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-speczifichnom-dlya-cpu-amd-kode-kvm-pozvolyayushhaya-vypolnit-kod-vne-gostevoj-sistemy","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u043e\u043c \u0434\u043b\u044f CPU AMD \u043a\u043e\u0434\u0435 KVM, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0432\u043d\u0435 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b | ProHoster","og:description":"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u0430\u043d\u0434\u044b Google Project Zero \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-29657) \u0432 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u044f\u0434\u0440\u0430 Linux \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 KVM, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u043e\u0431\u043e\u0439\u0442\u0438 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044e \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043a\u043e\u0434\u0435, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u043c \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u043c\u0438 AMD (\u043c\u043e\u0434\u0443\u043b\u044c kvm-amd.ko) \u0438 \u043d\u0435 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 Intel. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 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