{"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\/de\/blog\/news\/kriticheskaya-uyazvimost-v-imap-servere-dovecot","title":{"rendered":"Eine kritische Sicherheitsanf\u00e4lligkeit im IMAP-Server Dovecot.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Im korrigierenden Versionen<\/a><\/noindex> POP3\\\/IMAP4-Server Dovecot<\/a><\/noindex> 2.3.7.2 und 2.2.36.4 sowie in der Erg\u00e4nzung Pigeonhole 0.5.7.2 und 0.4.24.2 <\/a><\/noindex>, behoben kritische Sicherheitsanf\u00e4lligkeit<\/a><\/noindex> (CVE-2019-11500<\/a><\/noindex>), die es erm\u00f6glicht, Daten au\u00dferhalb des zugewiesenen Puffers durch das Senden einer speziell gestalteten Anfrage \u00fcber die Protokolle IMAP oder ManageSieve zu speichern. <\/p>\n

Das Problem kann in der Phase vor der Authentifizierung ausgenutzt werden. Ein funktionierender Exploit wurde bisher nicht entwickelt, aber die Entwickler von Dovecot schlie\u00dfen nicht aus, dass die Schwachstelle f\u00fcr die Durchf\u00fchrung von Angriffen zur Fernausf\u00fchrung von Code im System oder zur Leckage vertraulicher Daten genutzt werden k\u00f6nnte. Allen Nutzern wird dringend empfohlen, Updates umgehend zu installieren (Debian<\/a><\/noindex>, Fedora<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>, RHEL<\/a><\/noindex>, FreeBSD<\/a><\/noindex>).<\/p>\n

Die Schwachstelle ist in den Parsern der Protokolle IMAP und ManageSieve vorhanden und wird durch die fehlerhafte Verarbeitung von Null-Codezeichen beim Parsen von Daten innerhalb von in Anf\u00fchrungszeichen gesetzten Strings verursacht. Das Problem erm\u00f6glicht es, beliebige Daten in Objekte zu schreiben, die au\u00dferhalb des zugewiesenen Puffers gespeichert sind (in der Phase vor der Authentifizierung k\u00f6nnen bis zu 8 KB \u00fcberschrieben werden, nach der Authentifizierung bis zu 64 KB). <\/p>\n

Nach Meinung<\/a><\/noindex> Die Ingenieure von Red Hat weisen darauf hin, dass die Ausnutzung von Problemen f\u00fcr echte Angriffe dadurch erschwert wird, dass der Angreifer die Position einer willk\u00fcrlichen Daten\u00fcberschreibung im Heap nicht kontrollieren kann. Als Reaktion wird die Meinung ge\u00e4u\u00dfert, dass dieses Merkmal den Angriff erheblich erschwert, aber dessen Durchf\u00fchrung nicht ausschlie\u00dft \u2014 der Angreifer kann den Exploit so oft wiederholen, bis er in den funktionsf\u00e4higen Bereich im Heap gelangt.<\/p>\n

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

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

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