script-login in Dovecot 2.0.x before 2.0.13 does not follow the user and group configuration settings, which might allow remote authenticated users to bypass intended access restrictions by leveraging a script.

script-login in Dovecot 2.0.x before 2.0.13 does not follow the chroot configuration setting, which might allow remote authenticated users to conduct directory traversal attacks by leveraging a script.

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] http://www.dovecot.org/list/dovecot-news/2011-November/000200.html [2] https://secunia.com/advisories/46886/ [3] https://bugs.gentoo.org/showbug.cgi?id=390887 [4] http://wiki.dovecot.org/PasswordDatabase/ExtraFields/Proxy

Relevant upstream patch: [5] http://hg.dovecot.org/dovecot-2.0/rev/5e9eaf63a6b1

Dovecot has released version 1.2.17 [1] and 2.0.13 [2] to address a potential crash, and possibly mailbox corruption, when dovecot parsed header names that contained NUL characters. This was due to a pointer possibly pointing past allocated memory. An upstream patch [3] is available.

[1] http://dovecot.org/pipermail/dovecot/2011-May/059086.html [2] http://dovecot.org/pipermail/dovecot/2011-May/059085.html [3] http://hg.dovecot.org/dovecot-1.1/rev/3698dfe0f21c