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Category:   Application (E-mail Server)  >   Cyrus IMAP Server Vendors:   Carnegie Mellon University
Cyrus IMAP Server STARTTLS Buffer Flushing Flaw Lets Remote Users Inject Commands via Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1025625
SecurityTracker URL:  http://securitytracker.com/id/1025625
CVE Reference:   CVE-2011-1926   (Links to External Site)
Date:  Jun 9 2011
Impact:   Disclosure of authentication information, Disclosure of user information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.4.7
Description:   A vulnerability was reported in Cyrus IMAP Server. A remote user can inject commands.

The server does not flush the received commands buffer after switching to TLS encryption for IMAP, LMTP, NNTP, and POP3 sessions. A remote user can conduct a man-in-the-middle attack to inject commands and gain access to the target user's mail credentials or mail.

Impact:   A remote user can gain access to the target user's mail credentials or mail.
Solution:   The vendor has issued a fix (2.4.7).

The vendor's advisory is available at:

http://www.cyrusimap.org/docs/cyrus-imapd/2.4.7/changes.php

Vendor URL:  www.cyrusimap.org/ (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 9 2011 (Red Hat Issues Fix) Cyrus IMAP Server STARTTLS Buffer Flushing Flaw Lets Remote Users Inject Commands via Man-in-the-Middle Attacks
Red Hat has issued a fix for Red Hat Enterprise Linux 4, 5, and 6.



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