{"id":37658,"date":"2019-10-31T22:18:53","date_gmt":"2019-10-31T19:18:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kriticheskaya-uyazvimost-v-imap-servere-dovecot\/"},"modified":"2019-10-31T22:18:53","modified_gmt":"2019-10-31T19:18:53","slug":"kriticheskaya-uyazvimost-v-imap-servere-dovecot","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/kriticheskaya-uyazvimost-v-imap-servere-dovecot","title":{"rendered":"Vulnerabilit\u00e0 critica nel server IMAP Dovecot","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In aggiornamenti correttivi<\/a><\/noindex> server POP3\/IMAP4 Dovecot<\/a><\/noindex> 2.3.7.2 e 2.2.36.4, oltre ad Pigeonhole 0.5.7.2 e 0.4.24.2 <\/a><\/noindex>, risolta vulnerabilit\u00e0 critica<\/a><\/noindex> (CVE-2019-11500<\/a><\/noindex>), che consente di ottenere la scrittura di dati oltre il buffer allocato tramite l'invio di una richiesta appositamente formattata sui protocolli IMAP o ManageSieve. <\/p>\n

Il problema pu\u00f2 essere sfruttato prima della fase di autenticazione. Attualmente non esiste un exploit operativo, ma gli sviluppatori di Dovecot non escludono la possibilit\u00e0 di utilizzare la vulnerabilit\u00e0 per organizzare attacchi di esecuzione remota di codice nel sistema o per organizzare la fuga di dati riservati. Si raccomanda a tutti gli utenti di installare urgentemente gli aggiornamenti (Debian<\/a><\/noindex>, Fedora<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>, RHEL<\/a><\/noindex>, FreeBSD<\/a><\/noindex>).<\/p>\n

La vulnerabilit\u00e0 \u00e8 presente nei parser dei protocolli IMAP e ManageSieve ed \u00e8 causata da una gestione errata dei caratteri a codice nullo durante l'analisi dei dati all'interno di stringhe racchiuse tra virgolette. Il problema consente di scrivere dati arbitrari in oggetti memorizzati oltre il buffer allocato (nella fase precedente all'autenticazione \u00e8 possibile riscrivere fino a 8 Kb e dopo l'autenticazione fino a 64 Kb). <\/p>\n

Secondo secondo<\/a><\/noindex> Per gli ingegneri di Red Hat, l'uso delle vulnerabilit\u00e0 per attacchi reali \u00e8 complicato dal fatto che l'attaccante non pu\u00f2 controllare la posizione della sovrascrittura casuale dei dati nella heap. In risposta, si esprime l'opinione che questa caratteristica compliqui notevolmente l'attacco, ma non lo escluda, poich\u00e9 l'attaccante pu\u00f2 ripetere pi\u00f9 volte il tentativo di sfruttamento fino a quando non raggiunge l'area di lavoro nella heap.<\/p>\n

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

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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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-37658","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\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\udd47Vulnerabilit\u00e0 critica nel server IMAP Dovecot | ProHoster","description":"Negli aggiornamenti correttivi del server POP3\/IMAP4","canonical_url":"https:\/\/prohoster.info\/it\/blog\/news\/kriticheskaya-uyazvimost-v-imap-servere-dovecot","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\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 IMAP-\u0441\u0435\u0440\u0432\u0435\u0440\u0435 Dovecot | ProHoster","og:description":"\u0412 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 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