{"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\/fr\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","title":{"rendered":"Vuln\u00e9rabilit\u00e9 dans OpenZFS, compromet la gestion des droits d'acc\u00e8s sous FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dans ajout\u00e9<\/a><\/noindex> dans OpenZFS<\/a><\/noindex> code pour le support du syst\u00e8me d'exploitation FreeBSD a r\u00e9v\u00e9l\u00e9 une vuln\u00e9rabilit\u00e9 critique CVE-2020-10174<\/a><\/noindex> (CVE-2020-24717<\/a><\/noindex>), ce qui entra\u00eene une violation du traitement des droits d'acc\u00e8s. Le probl\u00e8me r\u00e9side dans le fait que les droits attribu\u00e9s au groupe \u00e9taient trait\u00e9s comme des droits pour le propri\u00e9taire du fichier. Le probl\u00e8me a \u00e9t\u00e9 corrig\u00e9e<\/a><\/noindex> dans la mise \u00e0 jour OpenZFS 2.0.0-rc1<\/a><\/noindex>. Correction un correctif a \u00e9t\u00e9 apport\u00e9<\/a><\/noindex> \u00e0 la traduction<\/a><\/noindex> de la base de code FreeBSD HEAD sur OpenZFS.<\/p>\n

Le probl\u00e8me a \u00e9t\u00e9 caus\u00e9 par le fait que tous les \u00e9l\u00e9ments de la liste de contr\u00f4le d'acc\u00e8s (ACE) d\u00e9finis pour le propri\u00e9taire du groupe (group@) et les groupes ordinaires (group:) \u00e9taient d\u00e9l\u00e9gu\u00e9s \u00e0 l'utilisateur actuel.
\nPar exemple, un mode d'acc\u00e8s 0770 (\u00e9criture autoris\u00e9e uniquement pour les membres du groupe) \u00e9tait trait\u00e9 comme 0777 (\u00e9criture autoris\u00e9e pour tous les utilisateurs). Une situation similaire a \u00e9t\u00e9 observ\u00e9e avec les ACL, par exemple, l'ACL ci-dessous devenait \u00e9quivalent aux droits 0777, car la v\u00e9rification de la membre du groupe pour builtin_administrators retourne True.<\/p>\n

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

Un autre probl\u00e8me a \u00e9galement \u00e9t\u00e9 identifi\u00e9 dans le port OpenZFS pour FreeBSD concernant la fourniture de droits pour acc\u00e9der \u00e0 un r\u00e9pertoire (cd), ind\u00e9pendamment de l'\u00e9tat du drapeau d'ex\u00e9cution pour les r\u00e9pertoires. L'acc\u00e8s au r\u00e9pertoire \u00e9tait possible m\u00eame en cas d'interdiction explicite via ACL (\u00ab deny \u2013 execute \u00bb). <\/p>\n

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

Source : 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, 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