{"id":38281,"date":"2019-10-31T22:22:43","date_gmt":"2019-10-31T19:22:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-vhost-net-pozvolyayushhaya-obojti-izolyatsiyu-v-sistemah-na-baze-qemu-kvm\/"},"modified":"2019-10-31T22:22:43","modified_gmt":"2019-10-31T19:22:43","slug":"uyazvimost-v-vhost-net-pozvolyayushhaya-obojti-izolyatsiyu-v-sistemah-na-baze-qemu-kvm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/uyazvimost-v-vhost-net-pozvolyayushhaya-obojti-izolyatsiyu-v-sistemah-na-baze-qemu-kvm","title":{"rendered":"Eine Schwachstelle in vhost-net, die es erm\u00f6glicht, die Isolation in QEMU-KVM-basierten Systemen zu umgehen.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Offenbart<\/a><\/noindex> Informationen \u00fcber Sicherheitsanf\u00e4lligkeiten<\/a><\/noindex> (CVE-2019-14835<\/a><\/noindex>), die es erm\u00f6glicht, \u00fcber die Gastgeberumgebung in KVM (qemu-kvm) hinauszugehen und eigenen Code im Kontext des Linux-Kernels auszuf\u00fchren. Die Schwachstelle tr\u00e4gt den Codenamen V-gHost. Dieses Problem erlaubt es, aus der Gastumgebung Bedingungen f\u00fcr einen Buffer Overflow im vhost-net-Kernelmodul (Netzwerk-Backend f\u00fcr virtio) zu schaffen, das auf der Gastgeberumgebung ausgef\u00fchrt wird. Ein Angreifer mit privilegierten Zugang zur Gastumgebung kann den Angriff w\u00e4hrend der Migration von virtuellen Maschinen durchf\u00fchren.<\/p>\n

Behebung des Problems aktiviert.<\/a><\/noindex> im Kern von Linux 5.3. Um die Sicherheitsanf\u00e4lligkeit zu umgehen, kann die Live-Migration von Gast-Systemen deaktiviert oder das vhost-net-Modul deaktiviert werden (f\u00fcgen Sie \u201eblacklist vhost-net\u201c in \/etc\/modprobe.d\/blacklist.conf hinzu). Das Problem tritt ab Linux-Kernel 2.6.34 auf. Die Schwachstelle wurde in Ubuntu<\/a><\/noindex> und , aber bisher ist er noch nicht in<\/a><\/noindex>ArchLinux Debian<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, SUSE<\/a><\/noindex> und RHEL<\/a><\/noindex>.<\/p>\n

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

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

\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2019-14835), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0432\u044b\u0439\u0442\u0438 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432 KVM (qemu-kvm) \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 \u0432 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 \u044f\u0434\u0440\u0430 Linux. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f V-gHost. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0438\u0437 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u0443\u0441\u043b\u043e\u0432\u0438\u044f \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0431\u0443\u0444\u0435\u0440\u0430 \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 \u044f\u0434\u0440\u0430 vhost-net (\u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u0431\u044d\u043a\u0435\u043d\u0434 \u0434\u043b\u044f virtio), \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u043c \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f. \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c […]<\/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-38281","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\udd47Schwachstelle in vhost-net, die die Isolation in QEMU-KVM-basierten Systemen umgeht | ProHoster","description":"Information \u00fcber die Schwachstelle (CVE-2019-14835), die es erm\u00f6glicht, die Grenzen des Gastsystems in KVM (qemu-kvm) zu \u00fcberschreiten und eigenen Code im Kontext des Linux-Kernels auf der Host-Seite auszuf\u00fchren, wurde ver\u00f6ffentlicht. Der Schwachstelle wurde der Codename V-gHost zugewiesen. Das Problem erm\u00f6glicht es, aus dem Gastsystem Bedingungen f\u00fcr einen Buffer Overflow im vhost-net-Kernelmodul (Netzwerk-Backend f\u00fcr virtio), das auf der Host-Seite ausgef\u00fchrt wird, zu schaffen. Der Angriff kann erfolgen.","canonical_url":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/uyazvimost-v-vhost-net-pozvolyayushhaya-obojti-izolyatsiyu-v-sistemah-na-baze-qemu-kvm","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"de_DE","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 vhost-net, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0431\u043e\u0439\u0442\u0438 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044e \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u043d\u0430 \u0431\u0430\u0437\u0435 QEMU-KVM | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2019-14835), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0432\u044b\u0439\u0442\u0438 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432 KVM (qemu-kvm) \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 \u0432 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 \u044f\u0434\u0440\u0430 Linux. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e 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