I ricercatori del team Google Project Zero hanno identificato una vulnerabilit\u00e0 (CVE-2021-29657) nell'ipervisor KVM fornito con il kernel Linux, che consente di bypassare l'isolamento del sistema guest ed eseguire codice nell'ambiente host. Il problema \u00e8 presente nel codice utilizzato su sistemi con processori AMD (modulo kvm-amd.ko) e non si manifesta su processori Intel. <\/p>\n
\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 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c root shell \u0432 \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u043c AMD Epyc 7351P \u0438 \u044f\u0434\u0440\u043e\u043c Linux 5.10. \u041e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u044d\u0442\u043e \u043f\u0435\u0440\u0432\u0430\u044f \u0431\u0440\u0435\u0448\u044c \u043a\u043b\u0430\u0441\u0441\u0430 «guest-to-host» \u0432 \u0441\u0430\u043c\u043e\u043c \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 KVM<\/a>, non correlata a errori nei componenti eseguiti nello spazio utente, come QEMU. La correzione \u00e8 stata accettata nel kernel a fine marzo. Il problema si manifesta a partire dal kernel Linux 5.10-rc1 e fino a v5.12-rc6, cio\u00e8 riguarda solo i kernel 5.10 e 5.11 (la maggior parte dei rami stabili delle distribuzioni non \u00e8 stata influenzata dal problema). <\/p>\n Il problema \u00e8 presente nel meccanismo nested_svm_vmrun, implementato utilizzando l'estensione AMD SVM (Secure Virtual Machine) e che consente di organizzare l'esecuzione annidata di sistemi guest. Per realizzare correttamente questa funzionalit\u00e0, l'ipervisor deve intercettare tutte le istruzioni SVM eseguite nei sistemi guest, emulare il loro comportamento e sincronizzare lo stato con l'hardware, il che rappresenta un compito piuttosto complesso. Analizzando l'implementazione proposta in KVM, i ricercatori hanno trovato un errore logico che consente di influenzare il contenuto dei registri MSR (Model-Specific Register) dell'host dal sistema guest, che pu\u00f2 essere utilizzato per eseguire codice a livello di host. <\/p>\n \u0412 \u0447\u0430\u0441\u0442\u043d\u043e\u0441\u0442\u0438, \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 VMRUN \u0438\u0437 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432\u0442\u043e\u0440\u043e\u0433\u043e \u0443\u0440\u043e\u0432\u043d\u044f \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u043e\u0441\u0442\u0438 (L2, \u0437\u0430\u043f\u0443\u0449\u0435\u043d\u043d\u043e\u0439 \u0438\u0437 \u0434\u0440\u0443\u0433\u043e\u0439 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b) \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a\u043e \u0432\u0442\u043e\u0440\u043e\u043c\u0443 \u0432\u044b\u0437\u043e\u0432\u0443 nested_svm_vmrun \u0438 \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b svm->nested.hsave, \u043d\u0430 \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043d\u0430\u043a\u043b\u0430\u0434\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u0434\u0430\u043d\u043d\u044b\u0435 \u0438\u0437 vmcb \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b L2. \u0412 \u0438\u0442\u043e\u0433\u0435 \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u0435\u0442 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044f, \u043a\u043e\u0433\u0434\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b L2 \u043c\u043e\u0436\u043d\u043e \u043e\u0441\u0432\u043e\u0431\u043e\u0434\u0438\u0442\u044c \u043f\u0430\u043c\u044f\u0442\u044c \u0432 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0435 svm->nested.msrpm, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0445\u0440\u0430\u043d\u0438\u0442\u0441\u044f \u0431\u0438\u0442 MSR, \u043d\u0435\u0441\u043c\u043e\u0442\u0440\u044f \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u043e\u043d \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f, \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a MSR \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f. \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-news"],"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\udd47 Vulnerabilit\u00e0 nel codice KVM specifico per CPU AMD, che consente di eseguire codice al di fuori del sistema ospite | ProHoster","description":"I ricercatori del team Google Project Zero hanno scoperto una vulnerabilit\u00e0 (CVE-2021-29657) nel hypervisor KVM fornito con il kernel Linux, che consente di bypassare l'isolamento del sistema ospite ed eseguire il proprio codice lato 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"