{"id":92546,"date":"2020-08-28T07:42:57","date_gmt":"2020-08-28T05:42:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd"},"modified":"2020-08-28T07:42:57","modified_gmt":"2020-08-28T05:42:57","slug":"uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","title":{"rendered":"Zranite\u013enos\u0165 v OpenZFS, ktor\u00e1 nar\u00fa\u0161a spracovanie opr\u00e1vnen\u00ed vo FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V pridanom<\/a><\/noindex> v OpenZFS<\/a><\/noindex> k\u00f3de na podporu opera\u010dn\u00e9ho syst\u00e9mu FreeBSD bola zisten\u00e1 kritick\u00e1 zranite\u013enos\u0165<\/a><\/noindex> (CVE-2020-24717<\/a><\/noindex>), \u010do vedie k poru\u0161eniu spracovania pr\u00edstupov\u00fdch pr\u00e1v. Podstatou probl\u00e9mu je, \u017ee pr\u00e1va nastavovan\u00e9 pre skupinu sa spracov\u00e1vali ako pr\u00e1va pre vlastn\u00edka s\u00faboru. Probl\u00e9m bola odstr\u00e1nen\u00e1<\/a><\/noindex> v aktualiz\u00e1cii OpenZFS 2.0.0-rc1<\/a><\/noindex>. Oprava bola vykonan\u00e1<\/a><\/noindex> do prekladu<\/a><\/noindex> k\u00f3du b\u00e1zy FreeBSD HEAD na OpenZFS.<\/p>\n

Probl\u00e9m bol sp\u00f4soben\u00fd t\u00fdm, \u017ee v\u0161etky prvky zoznamu riadenia pr\u00edstupu (ACE), nastaven\u00e9 pre vlastn\u00edka skupiny (group@) a be\u017en\u00e9 skupiny (group:<n\u00e1zov>), boli delegovan\u00e9 pre aktu\u00e1lneho pou\u017e\u00edvate\u013ea.
\nNapr\u00edklad, pr\u00edstupov\u00fd re\u017eim 0770 (z\u00e1pis povolen\u00fd iba pre \u010dlenov skupiny) bol spracovan\u00fd ako 0777 (z\u00e1pis povolen\u00fd pre v\u0161etk\u00fdch pou\u017e\u00edvate\u013eov). Podobn\u00e1 situ\u00e1cia bola zaznamenan\u00e1 aj s ACL, napr\u00edklad ni\u017e\u0161ie uveden\u00fd ACL sa stal ekvivalentn\u00fd pr\u00e1vam 0777, preto\u017ee overenie \u010dlena skupiny pre builtin_administrators vracia hodnotu True.<\/p>\n

# owner: root
\n # group: wheel
\n group:builtin_administrators:rwxpDdaARWcCos:----:allow<\/p>\n

V portu OpenZFS pre FreeBSD bola identifikovan\u00e1 \u010fal\u0161ia probl\u00e9m s poskytovan\u00edm pr\u00e1v na prechod do adres\u00e1ra (cd), bez oh\u013eadu na stav pr\u00edznaku pr\u00e1v na vykon\u00e1vanie pre adres\u00e1re. Vstup do adres\u00e1ra bol mo\u017en\u00fd aj pri v\u00fdslovnom z\u00e1kaze cez ACL (\u201edeny \u2014 execute\u201c) <\/p>\n

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

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

\u0412 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u043c \u0432 OpenZFS \u043a\u043e\u0434\u0435 \u0434\u043b\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u041e\u0421 FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-24717), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u044e \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0430\u0432 \u0434\u043e\u0441\u0442\u0443\u043f\u0430. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043f\u0440\u0430\u0432\u0430, \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u0434\u043b\u044f \u0433\u0440\u0443\u043f\u043f\u044b, \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u043b\u0438\u0441\u044c \u043a\u0430\u043a \u043f\u0440\u0430\u0432\u0430 \u0434\u043b\u044f \u0432\u043b\u0430\u0434\u0435\u043b\u044c\u0446\u0430 \u0444\u0430\u0439\u043b\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0438 OpenZFS 2.0.0-rc1. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0432\u043d\u0435\u0441\u0435\u043d\u043e \u0434\u043e \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0439 \u0431\u0430\u0437\u044b FreeBSD HEAD \u043d\u0430 OpenZFS. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0431\u044b\u043b\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e […]<\/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-92546","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\udd47Zranite\u013enos\u0165 v OpenZFS, ktor\u00e1 naru\u0161uje spracovanie pr\u00edstupov\u00fdch pr\u00e1v vo FreeBSD | ProHoster","description":"V pridanom k\u00f3de OpenZFS 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