{"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\/da\/blog\/news\/uyazvimost-vo-freebsd-ekspluatiruemaya-cherez-vredonosnoe-usb-ustrojstvo","title":{"rendered":"Sikkerhedsvulnerability i FreeBSD, udnyttet via ondsindet USB-enhed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I FreeBSD er blevet l\u00f8st<\/a><\/noindex> En s\u00e5rbarhed i USB-stakken (CVE-2020-7456), som muligg\u00f8r udf\u00f8relse af kode p\u00e5 kernens niveau eller i brugerrummet ved tilslutning af et ondsindet USB-enhed til systemet. USB HID (Human Interface Device) enhedsdeskriptorer kan gemme og hente den nuv\u00e6rende tilstand, hvilket tillader at kombinere elementbeskrivelser i flerniveaus grupper. FreeBSD underst\u00f8tter op til 4 s\u00e5danne niveauer af hentning. Hvis niveauet ikke blev genoprettet ved behandling af den samme HID-komponent, bliver der foretaget et opkald til et ugyldigt hukommelsesomr\u00e5de. Problemet er l\u00f8st i opdateringerne FreeBSD 11.3-RELEASE-p10 og 12.1-RELEASE-p6. Som en midlertidig beskyttelsesmetode anbefales det at indstille parameteren «sysctl hw.usb.disable_enumeration=1».<\/p>\n

S\u00e5rbarheden blev opdaget af Andy Nguyen fra Google og overlapper ikke med et andet problem, der for nylig annonceret<\/a><\/noindex> af forskere fra Purdue Universitet og den f\u00f8derale polytekniske skole i Lausanne. Disse forskere har udviklet v\u00e6rkt\u00f8jet USBFuzz, som simulerer en ikke-fungerende USB-enhed til fuzzing-testning af USB-drivere. USBFuzz forventes snart at blive at blive offentliggjort p\u00e5 GitHub<\/a><\/noindex>. Ved hj\u00e6lp af det nye v\u00e6rkt\u00f8j blev 26 s\u00e5rbarheder opdaget, heraf 18 i Linux, 4 i Windows, 3 i macOS og en i FreeBSD. Detaljer om disse problemer er endnu ikke offentliggjort, det n\u00e6vnes blot, at 10 s\u00e5rbarheder har f\u00e5et CVE-identifikatorer, og 11 problemer i Linux er allerede blevet l\u00f8st. En lignende teknisk fuzzing-testmetode bruger<\/a><\/noindex> Andrey Konovalov fra Google, som i l\u00f8bet af de seneste par \u00e5r opdaget<\/a><\/noindex> 44<\/a><\/noindex> s\u00e5rbarheder<\/a><\/noindex> i USB-stakken i Linux.<\/p>\n

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

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

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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\u00e5rbarhed i FreeBSD, der udnyttes via et skadeligt USB-enhed | ProHoster","description":"I 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