{"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\/de\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","title":{"rendered":"Eine Schwachstelle in OpenZFS, die die Berechtigungsverwaltung in FreeBSD beeintr\u00e4chtigt.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Im hinzugef\u00fcgt<\/a><\/noindex> in OpenZFS<\/a><\/noindex> Code zur Unterst\u00fctzung des Betriebssystems FreeBSD enth\u00e4lt eine kritische eine Schwachstelle<\/a><\/noindex> (CVE-2020-24717<\/a><\/noindex>), die zu einer fehlerhaften Verarbeitung der Zugriffsrechte f\u00fchrt. Das Problem besteht darin, dass die f\u00fcr die Gruppe festgelegten Berechtigungen als Berechtigungen f\u00fcr den Dateiinhaber behandelt wurden. Das Problem behoben<\/a><\/noindex> in der Aktualisierung OpenZFS 2.0.0-rc1<\/a><\/noindex>. Die Behebung eingef\u00fchrt<\/a><\/noindex> bis \u00dcbersetzung<\/a><\/noindex> des Code-Basis von FreeBSD HEAD in OpenZFS.<\/p>\n

Das Problem wurde dadurch verursacht, dass alle Elemente der Zugriffssteuerungsliste (ACE), die f\u00fcr den Gruppenbesitzer (group@) und regul\u00e4re Gruppen (group:) festgelegt wurden, an den aktuellen Benutzer delegiert wurden.
\nBeispielsweise wurde der Zugriffsmodus 0770 (Schreiben nur f\u00fcr Mitglieder der Gruppe erlaubt) als 0777 (Schreiben f\u00fcr alle Benutzer erlaubt) behandelt. Eine \u00e4hnliche Situation trat bei den ACL auf, zum Beispiel wurde die folgende ACL zu den Rechten 0777 \u00e4quivalent, da die \u00dcberpr\u00fcfung der Mitgliedschaft in der Gruppe f\u00fcr builtin_administrators den Wert True ergibt.<\/p>\n

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

Au\u00dferdem wurde im OpenZFS-Port f\u00fcr FreeBSD ein weiteres Problem bei der Bereitstellung von Rechten f\u00fcr den Wechsel in ein Verzeichnis (cd) festgestellt, unabh\u00e4ngig vom Status des Ausf\u00fchrungsrechts f\u00fcr Verzeichnisse. Der Zugang zu einem Verzeichnis war unter anderem auch bei ausdr\u00fccklicher Verweigerung \u00fcber ACL (\u201edeny - execute\u201c) m\u00f6glich. <\/p>\n

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

Quelle: 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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