{"id":102631,"date":"2021-12-16T09:37:23","date_gmt":"2021-12-16T07:37:23","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-podsisteme-linux-yadra-usb-gadget-potenczialno-pozvolyayushhaya-vypolnit-kod"},"modified":"2021-12-16T09:37:23","modified_gmt":"2021-12-16T07:37:23","slug":"uyazvimost-v-podsisteme-linux-yadra-usb-gadget-potenczialno-pozvolyayushhaya-vypolnit-kod","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/news\/uyazvimost-v-podsisteme-linux-yadra-usb-gadget-potenczialno-pozvolyayushhaya-vypolnit-kod","title":{"rendered":"Sicherheitsanf\u00e4lligkeit im USB-Gadget-Subsystem des Linux-Kernels, die potenziell die Ausf\u00fchrung von Code erm\u00f6glicht","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Im USB-Gadget, einer Subsystem des Linux-Kernels, die eine Programmierschnittstelle zur Erstellung von Client-USB-Ger\u00e4ten und zur Software-Simulation von USB-Ger\u00e4ten bereitstellt, wurde eine Schwachstelle (CVE-2021-39685) entdeckt, die zu einem Informationsleck aus dem Kernel, zu Abst\u00fcrzen oder zur Ausf\u00fchrung willk\u00fcrlichen Codes auf Kernel-Ebene f\u00fchren kann. Ein nicht privilegierter lokaler Benutzer kann durch Manipulation mit verschiedenen Ger\u00e4teklassen, die auf der API USB Gadget basieren, wie rndis, hid, uac1, uac1_legacy und uac2, angreifen. <\/p>\n

Das Problem wurde in den k\u00fcrzlich ver\u00f6ffentlichten Updates f\u00fcr die Linux-Kernel 5.15.8, 5.10.85, 5.4.165, 4.19.221, 4.14.258, 4.9.293 und 4.4.295 behoben. In den Distributionen bleibt das Problem jedoch weiterhin ungel\u00f6st (Debian, Ubuntu, RHEL, SUSE, Fedora, Arch). Ein Prototyp eines Exploits wurde zur Demonstration der Schwachstelle vorbereitet. <\/p>\n

Das Problem wurde durch einen Buffer-Overrun in den Daten\u00fcbertragungsanfragen der Gadget-Treiber rndis, hid, uac1, uac1_legacy und uac2 verursacht. Durch die Ausnutzung dieser Schwachstelle kann ein nicht privilegierter Angreifer auf den Kernel-Speicher zugreifen, indem er eine spezielle Steueranfrage mit einem wLength-Feld sendet, das die Gr\u00f6\u00dfe des statischen Buffers \u00fcberschreitet, f\u00fcr den immer 4096 Byte (USB_COMP_EP0_BUFSIZ) reserviert werden. Im Verlauf des Angriffs k\u00f6nnen bis zu 65 KB Daten aus einem nicht privilegierten Prozess im Benutzerspeicher in den Kernel-Speicher gelesen oder geschrieben werden.
\n
Quelle: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 USB Gadget, \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 Linux, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u044b\u0439 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043a\u043b\u0438\u0435\u043d\u0442\u0441\u043a\u0438\u0445 USB-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0438 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0439 \u0441\u0438\u043c\u0443\u043b\u044f\u0446\u0438\u0438 USB-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-39685), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0442\u0435\u0447\u043a\u0435 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\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432, \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u043c\u0438 \u043d\u0430 \u0431\u0430\u0437\u0435 API USB Gadget, \u0442\u0430\u043a\u0438\u043c\u0438, \u043a\u0430\u043a […]<\/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-102631","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\udd47Eine Schwachstelle im Linux-Kernel-Subsystem USB Gadget, die potenziell die Ausf\u00fchrung von Code erm\u00f6glicht | ProHoster","description":"Im USB-Gadget, einer Subsystem 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