{"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\/nl\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","title":{"rendered":"Kwetsbaarheid in OpenZFS die de toegang rechten in FreeBSD verstoort","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In toegevoegd<\/a><\/noindex> in OpenZFS<\/a><\/noindex> code ter ondersteuning van het besturingssysteem FreeBSD bevat een kritieke kwetsbaarheid<\/a><\/noindex> (CVE-2020-24717<\/a><\/noindex>), wat leidt tot een schending van de toegangsrechten. Het probleem is dat de rechten die voor de groep zijn ingesteld, werden behandeld als de rechten van de eigenaar van het bestand. Het probleem opgelost<\/a><\/noindex> is opgelost in OpenZFS 2.0.0-rc1<\/a><\/noindex>. De oplossing is<\/a><\/noindex> tot betreft de<\/a><\/noindex> codebasis FreeBSD HEAD naar OpenZFS.<\/p>\n

Het probleem werd veroorzaakt doordat alle Access Control List (ACL) elementen, die zijn ingesteld voor de groeps-eigenaar (group@) en gewone groepen (group:), werden gedelegeerd aan de huidige gebruiker.
\nBijvoorbeeld, de toegangsmodus 0770 (schrijven toegestaan alleen voor groepsleden) werd behandeld als 0777 (schrijven toegestaan voor alle gebruikers). Een soortgelijke situatie deed zich voor met ACL, bijvoorbeeld de onderstaande ACL werd gelijkwaardig aan rechten 0777, omdat de groepslidmaatschapscontrole voor builtin_administrators de waarde True retourneert.<\/p>\n

# owner: root
\n # group: wheel
\n groep:builtin_administrators:rwxpDdaARWcCos:\u2014\u2014\u2014:staat toe<\/p>\n

In de OpenZFS-poort voor FreeBSD is ook een probleem vastgesteld met het verlenen van rechten om een map binnen te gaan (cd), ongeacht de status van de uitvoeringsrechten voor mappen. Toegang tot de map was mogelijk zelfs bij een expliciet verbod via ACL (\u00abdeny \u2014 execute\u00bb) <\/p>\n

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

Bron: 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 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