{"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\/pt\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","title":{"rendered":"Vulnerabilidade no OpenZFS, que compromete o tratamento de permiss\u00f5es no FreeBSD.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Em adicionado<\/a><\/noindex> em OpenZFS<\/a><\/noindex> c\u00f3digo para suporte ao sistema operacional FreeBSD detectou uma cr\u00edtica uma vulnerabilidade<\/a><\/noindex> (CVE-2020-24717<\/a><\/noindex>), causando uma viola\u00e7\u00e3o no tratamento de permiss\u00f5es. O cerne do problema \u00e9 que as permiss\u00f5es definidas para o grupo eram tratadas como permiss\u00f5es para o propriet\u00e1rio do arquivo. O problema no lan\u00e7amento<\/a><\/noindex> na atualiza\u00e7\u00e3o OpenZFS 2.0.0-rc1<\/a><\/noindex>. A corre\u00e7\u00e3o foi inserido<\/a><\/noindex> at\u00e9 da tradu\u00e7\u00e3o<\/a><\/noindex> da base de c\u00f3digo do FreeBSD HEAD para OpenZFS.<\/p>\n

O problema foi causado pelo fato de que todos os elementos da lista de controle de acesso (ACE), definidos para o propriet\u00e1rio do grupo (group@) e grupos comuns (group:), eram delegados ao usu\u00e1rio atual.
\nPor exemplo, o modo de acesso 0770 (permiss\u00e3o de escrita apenas para membros do grupo) era tratado como 0777 (permiss\u00e3o de escrita para todos os usu\u00e1rios). Uma situa\u00e7\u00e3o semelhante foi observada com ACL, por exemplo, o ACL abaixo tornava-se equivalente \u00e0s permiss\u00f5es 0777, j\u00e1 que a verifica\u00e7\u00e3o do membro do grupo para builtin_administrators retorna True.<\/p>\n

# owner: root
\n # group: wheel
\n grupo:builtin_administrators:rwxpDdaARWcCos:\u2014\u2014\u2014-:permitir<\/p>\n

Al\u00e9m disso, no port OpenZFS para FreeBSD, foi identificada mais um problema com a concess\u00e3o de permiss\u00f5es para acesso a diret\u00f3rios (cd), independentemente do estado da flag de permiss\u00e3o de execu\u00e7\u00e3o para diret\u00f3rios. O acesso ao diret\u00f3rio era poss\u00edvel mesmo com a proibi\u00e7\u00e3o expl\u00edcita atrav\u00e9s de ACL (\u00abdeny \u2014 execute\u00bb). <\/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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[…]<\/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\udd47Vulnerabilidade no OpenZFS que compromete o tratamento de permiss\u00f5es no FreeBSD | ProHoster","description":"No c\u00f3digo adicionado ao 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