{"id":103151,"date":"2022-01-31T21:36:52","date_gmt":"2022-01-31T19:36:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonnaya-root-uyazvimost-v-samba"},"modified":"2022-01-31T21:36:52","modified_gmt":"2022-01-31T19:36:52","slug":"udalyonnaya-root-uyazvimost-v-samba","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/udalyonnaya-root-uyazvimost-v-samba","title":{"rendered":"Vulnerabilit\u00e0 root remota in Samba","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Sono stati pubblicati aggiornamenti correttivi per i pacchetti 4.15.5, 4.14.12 e 4.13.17 che risolvono 3 vulnerabilit\u00e0. La vulnerabilit\u00e0 pi\u00f9 critica (CVE-2021-44142) consente a un attaccante remoto di eseguire codice arbitrario con privilegi di root su un sistema con una versione vulnerabile di Samba. A questo problema \u00e8 stato assegnato un livello di gravit\u00e0 di 9.9 su 10.    <\/p>\n<p>La vulnerabilit\u00e0 si manifesta solo quando si utilizza il modulo VFS vfs_fruit con impostazioni predefinite (fruit:metadata=netatalk o fruit:resource=file), che fornisce un ulteriore livello di compatibilit\u00e0 con i client macOS e migliora la portabilit\u00e0 con i file di Netatalk 3 AFP. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-dusseldorf\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3448\">server<\/a> Il problema \u00e8 causato da un overflow di buffer nel codice di parsing dei metadati con attributi estesi (EA, xattr), scatenato durante l'apertura dei file in smbd. Per eseguire l'attacco, l'utente deve avere accesso in scrittura agli attributi estesi del file, anche se l'attacco pu\u00f2 essere effettuato da un utente ospite, se tale scrittura \u00e8 consentita.          <\/p>\n<p>\u00c8 possibile monitorare le release degli aggiornamenti dei pacchetti nelle seguenti distribuzioni: Debian, Ubuntu, RHEL, SUSE, Fedora, Arch, FreeBSD. Come soluzione di protezione alternativa, \u00e8 possibile rimuovere il modulo 'fruit' dalla lista 'vfs objects' in smb.conf.      <\/p>\n<p>Le altre due vulnerabilit\u00e0:  <\/p>\n<ul>\n<li class=\"l\"> La vulnerabilit\u00e0 CVE-2022-0336 consente a un utente di Samba AD DC di masquerade come un altro servizio e di intercettare il traffico indirizzato a quel servizio. Per attuare l'attacco, l'utente deve avere il diritto di modificare l'attributo servicePrincipalName nell'account.\n<li class=\"l\"> La vulnerabilit\u00e0 CVE-2021-44141 pu\u00f2 portare a una fuga di informazioni sull'esistenza di file e directory nell'area FS al di fuori della partizione Samba esportata. L'attacco viene eseguito tramite la manipolazione di collegamenti simbolici.  <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56615\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 4.15.5, 4.14.12 \u0438 4.13.17 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 3 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-44142) \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0435\u0439 Samba. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 9.9 \u0438\u0437 10. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 VFS-\u043c\u043e\u0434\u0443\u043b\u044f vfs_fruit \u0441 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430\u043c\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e (fruit:metadata=netatalk \u0438\u043b\u0438 fruit:resource=file), \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c [&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-103151","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" 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