{"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\/sv\/blog\/news\/uyazvimost-vo-freebsd-ekspluatiruemaya-cherez-vredonosnoe-usb-ustrojstvo","title":{"rendered":"S\u00e5rbarhet i FreeBSD, utnyttjad via ett skadligt USB-enhet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I FreeBSD har \u00e5tg\u00e4rdats<\/a><\/noindex> En s\u00e5rbarhet i USB-stacken (CVE-2020-7456) som m\u00f6jligg\u00f6r exekvering av kod p\u00e5 k\u00e4rnniv\u00e5 eller i anv\u00e4ndarutrymme vid anslutning av ett skadligt USB-enhet till systemet. USB HID-enhetsbeskrivare (Human Interface Device) kan s\u00e4tta och h\u00e4mta det aktuella tillst\u00e5ndet, vilket m\u00f6jligg\u00f6r att kombinera beskrivningar av element i flera niv\u00e5er. FreeBSD st\u00f6der upp till 4 s\u00e5dana niv\u00e5er av extrahering. Om niv\u00e5n inte \u00e5terst\u00e4lls vid hantering av samma HID-element g\u00f6rs en \u00e5tg\u00e4rd mot ett felaktigt minnesomr\u00e5de. Problemet har \u00e5tg\u00e4rdats i FreeBSD-versionerna 11.3-RELEASE-p10 och 12.1-RELEASE-p6. Som en tillf\u00e4llig skydds\u00e5tg\u00e4rd rekommenderas att man s\u00e4tter parametern «sysctl hw.usb.disable_enumeration=1».<\/p>\n

S\u00e5rbarheten identifierades av Andy Nguyen fr\u00e5n Google och \u00f6verlappar inte med ett annat problem som nyligen tillk\u00e4nnagiven<\/a><\/noindex> forskare fr\u00e5n Purdue University och den federala polytekniska skolan i Lausanne. Dessa forskare har utvecklat verktyget USBFuzz, som simulerar ett felaktigt fungerande USB-enhet f\u00f6r fuzzningstestning av USB-drivrutiner. USBFuzz planeras att lanseras inom kort. publiceras p\u00e5 GitHub<\/a><\/noindex>. Med hj\u00e4lp av det nya verktyget har 26 s\u00e5rbarheter identifierats, varav 18 i Linux, 4 i Windows, 3 i macOS och en i FreeBSD. Detaljer om dessa problem avsl\u00f6jas inte \u00e4nnu, det n\u00e4mns endast att 10 s\u00e5rbarheter har f\u00e5tt CVE-identifierare, och 11 problem som upptr\u00e4der i Linux har redan \u00e5tg\u00e4rdats. En liknande teknik f\u00f6r fuzzing-testning till\u00e4mpar<\/a><\/noindex> Andrej Konovalov fr\u00e5n Google, som under de senaste \u00e5ren identifierade<\/a><\/noindex> 44<\/a><\/noindex> s\u00e5rbarheten<\/a><\/noindex> i USB-stacken p\u00e5 Linux.<\/p>\n

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

K\u00e4lla: 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\udd47S\u00e5rbarhet i FreeBSD, utnyttjad via en skadlig USB-enhet | ProHoster","description":"En 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