{"id":94397,"date":"2020-09-16T13:42:09","date_gmt":"2020-09-16T11:42:09","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ftpd-iz-freebsd-pozvolyavshaya-poluchit-root-dostup-pri-ispolzovanii-ftpchroot"},"modified":"2020-09-16T13:42:09","modified_gmt":"2020-09-16T11:42:09","slug":"uyazvimost-v-ftpd-iz-freebsd-pozvolyavshaya-poluchit-root-dostup-pri-ispolzovanii-ftpchroot","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimost-v-ftpd-iz-freebsd-pozvolyavshaya-poluchit-root-dostup-pri-ispolzovanii-ftpchroot","title":{"rendered":"Vulnerabilit\u00e0 in ftpd di FreeBSD, che consentiva di ottenere accesso root utilizzando ftpchroot","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nel server ftpd incluso in FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/freebsd-announce@freebsd.org\/msg00994.html\">identificata<\/a><\/noindex> \u00e8 stata trovata una vulnerabilit\u00e0 critica (CVE-2020-7468) che consente agli utenti, limitati alla propria home directory tramite l'opzione ftpchroot, di ottenere pieno accesso root al sistema. <\/p>\n<p>Il problema \u00e8 causato da una combinazione di un errore nell'implementazione del meccanismo di isolamento dell'utente tramite la chiamata chroot (in caso di errore durante il cambio dell'uid o l'esecuzione di chroot e chdir veniva mostrato un errore non fatale che non interrompeva la sessione) e dalla concessione a un utente FTP autenticato di privilegi sufficienti per aggirare la restrizione del percorso root nel filesystem. La vulnerabilit\u00e0 non si manifesta durante l'accesso al server FTP in modalit\u00e0 anonima o con un accesso utente completo senza ftpchroot. Il problema \u00e8 stato risolto negli aggiornamenti 12.1-RELEASE-p10, 11.4-RELEASE-p4 e 11.3-RELEASE-p14.<\/p>\n<p>Inoltre, si segnala la risoluzione di ulteriori tre vulnerabilit\u00e0 in 12.1-RELEASE-p10, 11.4-RELEASE-p4 e 11.3-RELEASE-p14:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/freebsd-announce@freebsd.org\/msg00992.html\">CVE-2020-7467<\/a><\/noindex> \u2014 vulnerabilit\u00e0 nel hypervisor Bhyve che consente dall'ambiente guest di scrivere informazioni nell'area di memoria dell'ambiente host e ottenere accesso completo al sistema host. Il problema \u00e8 causato dall'assenza di una restrizione di accesso alle istruzioni della CPU che operano con indirizzi fisici dell'host e si manifesta solo su sistemi con CPU AMD.\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/freebsd-announce@freebsd.org\/msg00993.html\">CVE-2020-24718<\/a><\/noindex> \u2014 vulnerabilit\u00e0 nell'hypervisor Bhyve che consente a un attaccante con diritti di root all'interno di ambienti isolati tramite Bhyve di eseguire codice a livello di kernel. Il problema \u00e8 causato dall'assenza di adeguate restrizioni di accesso alle strutture VMCS (Virtual Machine Control Structure) su sistemi con CPU Intel e VMCB (Virtual)<br \/>\nMachine Control Block) sui sistemi con CPU AMD.<\/p>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/freebsd-announce@freebsd.org\/msg00991.html\">CVE-2020-7464<\/a><\/noindex> \u2014 vulnerabilit\u00e0 nel driver ure (USB Ethernet Realtek RTL8152 e RTL8153) che consente l'invio di pacchetti spoofati da altri host tramite l'invio di frame di grandi dimensioni (superiori a 2048) o la sostituzione di pacchetti in altri VLAN.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53720\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 FreeBSD \u0441\u0435\u0440\u0432\u0435\u0440\u0435 ftpd \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-2020-7468), \u0434\u0430\u044e\u0449\u0430\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c, \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u043c \u0441\u0432\u043e\u0438\u043c \u0434\u043e\u043c\u0430\u0448\u043d\u0438\u043c \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u043e\u043c \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043e\u043f\u0446\u0438\u0438 ftpchroot, \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u043e\u043b\u043d\u044b\u0439 root-\u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0441\u043e\u0447\u0435\u0442\u0430\u043d\u0438\u0435\u043c \u043e\u0448\u0438\u0431\u043a\u0438 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0432\u044b\u0437\u043e\u0432\u0430 chroot (\u043f\u0440\u0438 \u0441\u0431\u043e\u044f\u0445 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0441\u043c\u0435\u043d\u044b uid \u0438\u043b\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f chroot \u0438 chdir \u0432\u044b\u0434\u0430\u0432\u0430\u043b\u0430\u0441\u044c \u043d\u0435\u0444\u0430\u0442\u0430\u043b\u044c\u043d\u0430\u044f \u043e\u0448\u0438\u0431\u043a\u0430, \u043d\u0435 [&hellip;]<\/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-94397","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 FreeBSD \u0441\u0435\u0440\u0432\u0435\u0440\u0435 ftpd \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-2020-7468).\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri 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(CVE-2020-7468).","canonical_url":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimost-v-ftpd-iz-freebsd-pozvolyavshaya-poluchit-root-dostup-pri-ispolzovanii-ftpchroot","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 ftpd \u0438\u0437 FreeBSD, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0432\u0448\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f \u043f\u0440\u0438 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