{"id":84776,"date":"2020-06-11T01:41:55","date_gmt":"2020-06-10T23:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-vo-freebsd-ekspluatiruemaya-cherez-vredonosnoe-usb-ustrojstvo"},"modified":"2020-06-11T01:41:55","modified_gmt":"2020-06-10T23:41:55","slug":"uyazvimost-vo-freebsd-ekspluatiruemaya-cherez-vredonosnoe-usb-ustrojstvo","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-vo-freebsd-ekspluatiruemaya-cherez-vredonosnoe-usb-ustrojstvo","title":{"rendered":"Vulnerabilidade no FreeBSD, explorada atrav\u00e9s de dispositivo USB malicioso","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No FreeBSD no lan\u00e7amento<\/a><\/noindex> Uma vulnerabilidade no stack USB (CVE-2020-7456) permite a execu\u00e7\u00e3o de c\u00f3digo no n\u00edvel do kernel ou no espa\u00e7o do usu\u00e1rio ao conectar um dispositivo USB malicioso ao sistema. Descritores de dispositivos USB HID (Dispositivo de Interface Humana) podem armazenar e extrair o estado atual, permitindo combinar descri\u00e7\u00f5es de elementos em grupos hier\u00e1rquicos. O FreeBSD suporta at\u00e9 4 n\u00edveis de extra\u00e7\u00e3o desse tipo. Se o n\u00edvel n\u00e3o for restaurado ao processar o mesmo elemento HID, ocorre uma refer\u00eancia a uma \u00e1rea de mem\u00f3ria inv\u00e1lida. O problema foi corrigido nas atualiza\u00e7\u00f5es FreeBSD 11.3-RELEASE-p10 e 12.1-RELEASE-p6. Como medida compensat\u00f3ria, recomenda-se definir o par\u00e2metro «sysctl hw.usb.disable_enumeration=1».<\/p>\n

A vulnerabilidade foi identificada por Andy Nguyen da Google e n\u00e3o se sobrep\u00f5e a outro problema recente anunciada<\/a><\/noindex> pesquisadores da Universidade Purdue e da Escola Polit\u00e9cnica Federal de Lausanne. Esses pesquisadores desenvolveram a ferramenta USBFuzz, que simula um dispositivo USB n\u00e3o funcional para testes de fuzzing em drivers USB. O USBFuzz est\u00e1 programado para ser lan\u00e7ado em breve. publicado no GitHub<\/a><\/noindex>. Com a nova ferramenta, foram identificadas 26 vulnerabilidades, das quais 18 no Linux, 4 no Windows, 3 no macOS e uma no FreeBSD. Os detalhes sobre esses problemas ainda n\u00e3o foram divulgados, mencionando apenas que 10 vulnerabilidades receberam identificadores CVE, enquanto 11 problemas no Linux j\u00e1 foram corrigidos. Uma t\u00e9cnica semelhante de teste de fuzzing aplica<\/a><\/noindex> Andrey Konovalov da Google, que, nos \u00faltimos anos, identificou<\/a><\/noindex> 44<\/a><\/noindex> no aplicativo para Windows, que permitia ao usu\u00e1rio elevar seus privil\u00e9gios no sistema para administrador (a vulnerabilidade foi causada pela intera\u00e7\u00e3o inadequada entre o cliente GUI sem privil\u00e9gios e o servi\u00e7o de sistema).<\/a><\/noindex> no stack USB do Linux.<\/p>\n

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

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

\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 USB-\u0441\u0442\u0435\u043a\u0435 (CVE-2020-7456), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u0438\u043b\u0438 \u0432 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043f\u0440\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0433\u043e USB-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430. \u0414\u0435\u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0440\u044b \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 USB HID (Human Interface Device) \u043c\u043e\u0433\u0443\u0442 \u043f\u043e\u043c\u0435\u0449\u0430\u0442\u044c \u0438 \u0438\u0437\u0432\u043b\u0435\u043a\u0430\u0442\u044c \u0442\u0435\u043a\u0443\u0449\u0435\u0435 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044f \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u0442\u044c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u044f \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u0432 \u043c\u043d\u043e\u0433\u043e\u0443\u0440\u043e\u0432\u043d\u0435\u0432\u044b\u0435 \u0433\u0440\u0443\u043f\u043f\u044b. FreeBSD \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u0442 \u0434\u043e 4 \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 \u0443\u0440\u043e\u0432\u043d\u0435\u0439 \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u044f. \u0415\u0441\u043b\u0438 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043d\u0435 […]<\/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-84776","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\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\udd47Vulnerabilidade no FreeBSD explorada atrav\u00e9s de um dispositivo USB malicioso | 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