{"id":112410,"date":"2023-12-22T03:10:14","date_gmt":"2023-12-22T01:10:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/smtp-smuggling-novaya-tehnika-spufinga-pochtovyh-soobshhenij"},"modified":"2023-12-22T03:10:14","modified_gmt":"2023-12-22T01:10:16","slug":"smtp-smuggling-novaya-tehnika-spufinga-pochtovyh-soobshhenij","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/smtp-smuggling-novaya-tehnika-spufinga-pochtovyh-soobshhenij","title":{"rendered":"SMTP Smuggling \u2014 una nuova tecnica di spoofing delle email","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I ricercatori di SEC Consult hanno pubblicato una nuova tecnica di spoofing, causata da discrepanze nell'aderenza alle specifiche in diverse implementazioni del protocollo SMTP. La tecnica di attacco proposta consente di suddividere un unico messaggio in pi\u00f9 messaggi diversi durante la sua trasmissione da un server SMTP di origine a un altro server SMTP, che interpreta in modo diverso la sequenza per la separazione delle email trasmesse attraverso una singola connessione. Questo metodo pu\u00f2 essere utilizzato per inviare email falsificate a nome di altri mittenti in servizi di posta elettronica che verificano il mittente originale.      <\/p>\n<p>Il problema \u00e8 causato dal fatto che i diversi server SMTP interpretano in modo diverso la sequenza di fine dati, il che pu\u00f2 portare alla suddivisione di un singolo messaggio in pi\u00f9 parti all'interno di una sessione con il server SMTP. Nella specifica per il marcaggio della fine della trasmissione del messaggio \u00e8 definita la sequenza \u00ab\r\n\r\n\u00bb (punti racchiusi da caratteri di ritorno a capo e nuova riga). Dopo questa sequenza possono seguire comandi per inviare un altro messaggio senza interrompere la connessione. Alcuni server SMTP seguono rigorosamente le indicazioni, mentre altri, per garantire la compatibilit\u00e0 con alcuni client di posta rari, trattano anche sequenze come \u00ab\n\n\u00bb, \u00ab\n\r\n\u00bb, \u00ab\r\n\n\u00bb, \u00ab\r\r\u00bb, \u00ab\r\n0.\r\n\u00bb e \u00ab\r\n0.\r\n\u00bb come separatori.       <\/p>\n<p>L'attacco consiste nel fatto che, al primo <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"un server\" data-wpil-keyword-link=\"linked\">un server<\/a>, il quale gestisce solo il separatore \u00ab\r\n\r\n\u00bb, invia un messaggio nel cui corpo \u00e8 presente un separatore alternativo, ad esempio, \u00ab\r\r\u00bb, seguito dai comandi per inviare un secondo messaggio. Poich\u00e9 il primo server segue rigorosamente la specifica, gestisce la sequenza ricevuta come un unico messaggio. Se posteriormente il messaggio viene inviato a un server di transito o al server del destinatario, il quale interpreta ulteriormente la sequenza \u00ab\r\r\u00bb come separatore, verr\u00e0 elaborato come due messaggi separati (il secondo messaggio pu\u00f2 essere inviato a nome di un utente non autenticato tramite \u00abAUTH LOGIN\u00bb, ma apparire corretto dal lato del destinatario).        <center><img decoding=\"async\" alt=\"SMTP Smuggling - nuova tecnica di spoofing delle email\" src=\"\/wp-content\/uploads\/2023\/12\/d25550a1e74dd7661328771ac417cf0a.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <center><img decoding=\"async\" alt=\"SMTP Smuggling - nuova tecnica di spoofing delle email\" src=\"\/wp-content\/uploads\/2023\/12\/a2e617933f361c03cef3c40350157f4c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Come esempi di server SMTP e servizi che ammettono separatori alternativi, possiamo citare Postfix, Sendmail, MS Exchange Online e Cisco Secure Email Gateway, mentre tra i servizi di posta che non filtrano separatori non corretti dai messaggi durante l'invio ad altri server ci sono GMX, iCloud e Microsoft Outlook.      <\/p>\n<p>Per bloccare il problema in Postfix, nelle versioni 3.8.1, 3.7.6, 3.6.10 e 3.5.20 \u00e8 stata aggiunta l'impostazione \u00absmtpd_forbid_unauth_pipelining\u00bb, che provoca la chiusura della connessione in caso di utilizzo di separatori non conformi ai requisiti di RFC 2920 e RFC 5321. Attualmente questa impostazione \u00e8 disattivata per default, ma \u00e8 prevista l'attivazione di default nella branch Postfix 3.9, che \u00e8 attesa per la primavera del 2024. Nella branch 3.9 sar\u00e0 anche inclusa l'impostazione smtpd_forbid_bare_newline, che restituir\u00e0 un errore se viene utilizzato solo il carattere di nuova riga (\u00ab\n\u00bb) per separare le righe, violando cos\u00ec l'RFC 5321.     <\/p>\n<p>Nella prossima release di Sendmail 8.18.0.2, per proteggersi da attacchi, nella srv_features \u00e8 stata proposta l'opzione \u2018o\u2019, che abilita la gestione solo della sequenza \u00ab\r\n\r\n\u00bb. Si nota che disabilitare il supporto per separatori alternativi pu\u00f2 compromettere il funzionamento di alcuni client di posta rari che non rispettano completamente la specifica SMTP.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60329\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 SEC Consult \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u0441\u043f\u0443\u0444\u0438\u043d\u0433\u0430, \u0432\u044b\u0437\u0432\u0430\u043d\u043d\u0443\u044e \u0440\u0430\u0441\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f\u043c\u0438 \u0432 \u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0432 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SMTP. \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0430\u0442\u0430\u043a\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0440\u0430\u0441\u0449\u0435\u043f\u0438\u0442\u044c \u043e\u0434\u043d\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0440\u0430\u0437\u043d\u044b\u0445 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u043f\u0440\u0438 \u0435\u0433\u043e \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0435 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u043c SMTP-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c \u043d\u0430 \u0434\u0440\u0443\u0433\u043e\u0439 SMTP-\u0441\u0435\u0440\u0432\u0435\u0440, \u043f\u043e \u0438\u043d\u043e\u043c\u0443 \u0442\u0440\u0430\u043a\u0442\u0443\u044e\u0449\u0438\u0439 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0434\u043b\u044f \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0438\u0441\u0435\u043c, \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0445 \u0447\u0435\u0440\u0435\u0437 \u043e\u0434\u043d\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. \u041c\u0435\u0442\u043e\u0434 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u0444\u0438\u043a\u0442\u0438\u0432\u043d\u044b\u0445 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":112411,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-112410","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 SEC Consult \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u0441\u043f\u0443\u0444\u0438\u043d\u0433\u0430, \u0432\u044b\u0437\u0432\u0430\u043d\u043d\u0443\u044e 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La tecnica di attacco proposta consente di suddividere un singolo messaggio in pi\u00f9 messaggi distinti durante il trasferimento da un server SMTP a un altro, il quale interpreta diversamente la sequenza per la separazione dei messaggi inviati attraverso una singola connessione. Questo metodo pu\u00f2 essere utilizzato per inviare messaggi falsi","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/smtp-smuggling-novaya-tehnika-spufinga-pochtovyh-soobshhenij","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\udd47SMTP Smuggling \u2014 \u043d\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0441\u043f\u0443\u0444\u0438\u043d\u0433\u0430 \u043f\u043e\u0447\u0442\u043e\u0432\u044b\u0445 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 | 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