{"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\/it\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","title":{"rendered":"Vulnerabilit\u00e0 in OpenZFS che compromette la gestione dei diritti di accesso in FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In aggiunto<\/a><\/noindex> in OpenZFS<\/a><\/noindex> nel codice per il supporto del sistema operativo FreeBSD \u00e8 stata trovata una vulnerabilit\u00e0 critica vulnerabilit\u00e0<\/a><\/noindex> (CVE-2020-24717<\/a><\/noindex>), che porta a una violazione della gestione dei diritti di accesso. Il problema \u00e8 che i diritti impostati per il gruppo venivano trattati come diritti per il proprietario del file. Il problema \u00e8 stato risolto<\/a><\/noindex> nell'aggiornamento OpenZFS 2.0.0-rc1<\/a><\/noindex>. La correzione \u00e8 stata apportata<\/a><\/noindex> fino a alla<\/a><\/noindex> base di codice di FreeBSD HEAD su OpenZFS.<\/p>\n

Il problema era causato dal fatto che tutti gli elementi della lista di controllo degli accessi (ACE) impostati per il proprietario del gruppo (group@) e per i gruppi normali (group:) venivano delegati all'utente corrente.
\nAd esempio, il modo di accesso 0770 (scrittura consentita solo ai membri del gruppo) veniva trattato come 0777 (scrittura consentita per tutti gli utenti). Una situazione simile si \u00e8 verificata con ACL, ad esempio, il seguente ACL diventava equivalente ai diritti 0777, poich\u00e9 il controllo del membro del gruppo per builtin_administrators restituisce True.<\/p>\n

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

\u00c8 emersa un'altra problematica nel port di OpenZFS per FreeBSD riguardo all'assegnazione dei diritti di accesso ai directory (cd), indipendentemente dallo stato del flag dei diritti di esecuzione per le directory. L'accesso alla directory era possibile anche in presenza di un divieto esplicito tramite ACL (\u201cdeny - execute\u201d). <\/p>\n

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

Fonte: 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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