{"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\/it\/blog\/novosti-interneta\/uyazvimost-v-podsisteme-linux-yadra-usb-gadget-potenczialno-pozvolyayushhaya-vypolnit-kod","title":{"rendered":"Vulnerabilit\u00e0 nel sottosistema USB Gadget del kernel Linux, che consente potenzialmente l'esecuzione di codice","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In USB Gadget, a subsystem of the Linux kernel that provides a software interface for creating client USB devices and simulating USB devices, a vulnerability has been discovered (CVE-2021-39685) that could lead to information leakage from the kernel, crashes, or arbitrary code execution at the kernel level. The attack is carried out by an unprivileged local user through manipulation of various device classes implemented based on the USB Gadget API, such as rndis, hid, uac1, uac1_legacy, and uac2. <\/p>\n

The issue has been resolved in the recently published updates of the Linux kernel 5.15.8, 5.10.85, 5.4.165, 4.19.221, 4.14.258, 4.9.293, and 4.4.295. However, the problem remains unfixed in distributions (Debian, Ubuntu, RHEL, SUSE, Fedora, Arch). A prototype exploit has been prepared to demonstrate the vulnerability. <\/p>\n

Il problema \u00e8 causato da un overflow del buffer nei gestori delle richieste di trasferimento dati nei driver gadget rndis, hid, uac1, uac1_legacy e uac2. A seguito dello sfruttamento di questa vulnerabilit\u00e0, un attaccante non privilegiato potrebbe accedere alla memoria del kernel inviando una richiesta di controllo speciale con un valore del campo wLength che supera la dimensione di un buffer statico, per il quale vengono sempre allocati 4096 byte (USB_COMP_EP0_BUFSIZ). Durante l'attacco \u00e8 possibile leggere o scrivere fino a 65 KB di dati nella memoria del kernel da un processo non privilegiato nello spazio utente.
\n
Fonte: 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 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0438\u0437 \u044f\u0434\u0440\u0430, \u043a\u0440\u0430\u0445\u0443 \u0438\u043b\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430. \u0410\u0442\u0430\u043a\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0441 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u043c\u0438 \u043a\u043b\u0430\u0441\u0441\u0430\u043c\u0438 \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-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\udd47Vulnerabilit\u00e0 nella sottosistema USB Gadget del kernel Linux, che potrebbe consentire l'esecuzione di codice | ProHoster","description":"In USB Gadget, la sottosistema del kernel Linux che fornisce un'interfaccia software per la creazione di dispositivi USB client e la simulazione software di dispositivi USB, \u00e8 stata identificata una vulnerabilit\u00e0 (CVE-2021-39685), che potrebbe portare a una fuga di informazioni dal kernel, un crash o l'esecuzione di codice arbitrario a livello di kernel. L'attacco \u00e8 condotto da un utente locale non privilegiato tramite manipolazioni di diverse classi di dispositivi implementate sulla base dell'API USB Gadget, come...","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-podsisteme-linux-yadra-usb-gadget-potenczialno-pozvolyayushhaya-vypolnit-kod","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 Linux-\u044f\u0434\u0440\u0430 USB 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