{"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\/sq\/blog\/novosti-interneta\/uyazvimost-v-speczifichnom-dlya-cpu-amd-kode-kvm-pozvolyayushhaya-vypolnit-kod-vne-gostevoj-sistemy","title":{"rendered":"Nj\u00eb vulnerab\u00ebl n\u00eb kodin specifik t\u00eb CPU AMD KVM, e cila mund\u00ebson ekzekutimin e kodit jasht\u00eb sistemit t\u00eb mysafir\u00ebve","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

K\u00ebrkuesit nga ekipi Google Project Zero zbuluan nj\u00eb vulnerab\u00ebl (CVE-2021-29657) n\u00eb hipervizorin KVM t\u00eb dor\u00ebzuar me kernelin Linux, e cila mund\u00ebson kalimin e izolimit t\u00eb sistemit t\u00eb mysafir\u00ebve dhe ekzekutimin e kodit t\u00eb tij n\u00eb ambientin e hostit. Problemi \u00ebsht\u00eb i pranish\u00ebm n\u00eb kodin q\u00eb p\u00ebrdoret n\u00eb sistemet me procesor\u00eb AMD (moduli kvm-amd.ko) dhe nuk shfaqet p\u00ebr procesor\u00ebt Intel. <\/p>\n

K\u00ebrkuesit kan\u00eb p\u00ebrgatitur nj\u00eb prototip funksional t\u00eb eksploitit q\u00eb lejon nga nj\u00eb mjedis mysafir t\u00eb filloj\u00eb nj\u00eb shell root n\u00eb mjedisin e hostit n\u00eb nj\u00eb sistem me procesor AMD Epyc 7351P dhe b\u00ebrtham\u00eb Linux 5.10. Kjo konsiderohet si dob\u00ebsia e par\u00eb e klas\u00ebs 'guest-to-host' n\u00eb vet\u00eb hypervisorin. KVM<\/a>, e cila nuk \u00ebsht\u00eb e lidhur me gabimet n\u00eb komponent\u00ebt q\u00eb ekzekutohen n\u00eb hap\u00ebsir\u00ebn e p\u00ebrdoruesit, si QEMU. Nj\u00eb rregullim u pranuar n\u00eb kernel n\u00eb fund t\u00eb marsit. Problemi shfaqet q\u00eb nga kernel Linux 5.10-rc1 deri n\u00eb v5.12-rc6, dometh\u00ebn\u00eb mbulon vet\u00ebm kernel\u00ebt 5.10 dhe 5.11 (problemi nuk e preku shumic\u00ebn e deg\u00ebve stabile t\u00eb shp\u00ebrndarjeve). <\/p>\n

Problemi \u00ebsht\u00eb prezent n\u00eb mekanizmin nested_svm_vmrun, i implementuar duke p\u00ebrdorur zgjerimin AMD SVM (Secure Virtual Machine) dhe q\u00eb lejon organizimin e ekzekutimeve t\u00eb brendshme t\u00eb sistemeve mikprit\u00ebs. P\u00ebr nj\u00eb implementim t\u00eb sakt\u00eb t\u00eb k\u00ebsaj funksionaliteti, hiperizmatori duhet t\u00eb kap\u00eb t\u00eb gjitha instruktionet SVM q\u00eb ekzekutohen n\u00eb sistemet mikprit\u00ebs, t\u00eb imitoj\u00eb sjelljen e tyre dhe t\u00eb sinkronizoj\u00eb gjendjen me pajisjen, gj\u00eb q\u00eb \u00ebsht\u00eb nj\u00eb detyr\u00eb mjaft e komplikuar. Pas analiz\u00ebs s\u00eb implementimit t\u00eb propozuar n\u00eb KVM, studiuesit zbuluan nj\u00eb gabim logjik q\u00eb lejon ndryshimin e p\u00ebrmbajtjes s\u00eb regjistrave MSR (Model-Specific Register) t\u00eb hostit nga sistemi mikprit\u00ebs, gj\u00eb q\u00eb mund t\u00eb p\u00ebrdoret p\u00ebr t\u00eb ekzekutuar kod n\u00eb nivelin e hostit. <\/p>\n

N\u00eb ve\u00e7anti, ekzekutimi i operacionit VMRUN nga sistemi mysafir i nivelit t\u00eb dyt\u00eb (L2, i nisur nga nj\u00eb sistem mysafir tjet\u00ebr) \u00e7on n\u00eb nj\u00eb thirrje t\u00eb dyt\u00eb t\u00eb nested_svm_vmrun dhe d\u00ebmton struktur\u00ebn svm->nested.hsave, mbi t\u00eb cil\u00ebn vendosen t\u00eb dh\u00ebnat nga vmcb i sistemit mysafir L2. Si rezultat, krijohet nj\u00eb situat\u00eb ku n\u00eb nivelin e sistemit mysafir L2 mund t\u00eb lirohet memoria n\u00eb struktur\u00ebn svm->nested.msrpm, e cila ruan bitin MSR, pavar\u00ebsisht se ai vazhdon t\u00eb p\u00ebrdoret, dhe t\u00eb arrihet n\u00eb MSR t\u00eb mjedisit t\u00eb hostit.
\n
Burimi: 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\udd47 Vulnerabilitet n\u00eb kodin e ve\u00e7ant\u00eb p\u00ebr CPU AMD t\u00eb KVM, q\u00eb lejon ekzekutimin e kodit jasht\u00eb sistemit mik | ProHoster","description":"K\u00ebrkuesit nga ekipi Google Project Zero zbuluan nj\u00eb vulnerabilitet (CVE-2021-29657) n\u00eb hipervizorin KVM, i p\u00ebrfshir\u00eb n\u00eb Kernelin Linux, q\u00eb lejon tejkalimin e izolimit t\u00eb sistemit mik dhe ekzekutimin e kodit t\u00eb tyre n\u00eb an\u00ebn e ambientit host. Problemi \u00ebsht\u00eb prezent n\u00eb kodin q\u00eb p\u00ebrdoret n\u00eb sistemet me procesor\u00eb AMD (moduli kvm-amd.ko) dhe nuk shfaqet p\u00ebr procesor\u00ebt Intel. K\u00ebrkuesit kan\u00eb p\u00ebrgatitur nj\u00eb prototip funksional t\u00eb eksploitit, q\u00eb lejon nga sistemi mik.","canonical_url":"https:\/\/prohoster.info\/sq\/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":"sq_AL","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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\u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0433\u043e","og:url":"https:\/\/prohoster.info\/sq\/blog\/novosti-interneta\/uyazvimost-v-speczifichnom-dlya-cpu-amd-kode-kvm-pozvolyayushhaya-vypolnit-kod-vne-gostevoj-sistemy","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2021-06-30T20:23:10+00:00","article:modified_time":"2021-06-30T20:23:10+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"100636","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-06-30 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