REDHAT-BUG-754980
First published: Fri Nov 18 2011(Updated: )
A security flaw was found in the way Dovecot, an IMAP and POP3 email server, performed remote server identity verification (x509 certificate's Common Name field was not checked to match provided remote server host name), when Dovecot was configured to proxy IMAP and POP3 connections to remote hosts and TLS/SSL protocols were requested (ssl=yes or starttls=yes) in the configuration to secure these connections to the destination server. A remote attacker could use this flaw to conduct man-in-the-middle (MITM) attacks via specially-crafted x509v3 certificate. References: [1] <a href="http://www.dovecot.org/list/dovecot-news/2011-November/000200.html">http://www.dovecot.org/list/dovecot-news/2011-November/000200.html</a> [2] <a href="https://secunia.com/advisories/46886/">https://secunia.com/advisories/46886/</a> [3] <a href="https://bugs.gentoo.org/show_bug.cgi?id=390887">https://bugs.gentoo.org/show_bug.cgi?id=390887</a> [4] <a href="http://wiki.dovecot.org/PasswordDatabase/ExtraFields/Proxy">http://wiki.dovecot.org/PasswordDatabase/ExtraFields/Proxy</a> Relevant upstream patch: [5] <a href="http://hg.dovecot.org/dovecot-2.0/rev/5e9eaf63a6b1">http://hg.dovecot.org/dovecot-2.0/rev/5e9eaf63a6b1</a>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Dovecot |
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Reference Links
- http://www.dovecot.org/list/dovecot-news/2011-November/000200.html
- https://secunia.com/advisories/46886/
- https://bugs.gentoo.org/show_bug.cgi?id=390887
- http://wiki.dovecot.org/PasswordDatabase/ExtraFields/Proxy
- http://hg.dovecot.org/dovecot-2.0/rev/5e9eaf63a6b1
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=754981
- http://www.openwall.com/lists/oss-security/2011/11/18/4
- http://www.openwall.com/lists/oss-security/2011/11/18/7
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=754980#c0
- http://hg.dovecot.org/dovecot-2.0/rev/de8715e4d793
- http://thread.gmane.org/gmane.comp.security.oss.general/6275/focus=6276
- https://rhn.redhat.com/errata/RHSA-2013-0520.html
- https://bugzilla.redhat.com/show_bug.cgi?id=754980
Frequently Asked Questions
What is the severity of REDHAT-BUG-754980?
The severity of REDHAT-BUG-754980 is considered high due to potential man-in-the-middle attacks.
How do I fix REDHAT-BUG-754980?
To fix REDHAT-BUG-754980, ensure that you update Dovecot to the latest version where this vulnerability has been addressed.
What kind of systems are affected by REDHAT-BUG-754980?
REDHAT-BUG-754980 affects systems running Dovecot configured to proxy IMAP and POP3 connections.
What are the consequences of REDHAT-BUG-754980?
The consequences of REDHAT-BUG-754980 include the potential for attackers to impersonate remote servers due to improper verification.
When was REDHAT-BUG-754980 disclosed?
REDHAT-BUG-754980 was disclosed in November 2011.
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