dovecot 1.0.7 in Red Hat Enterprise Linux (RHEL) 5, and possibly Fedora, uses world-readable permissions for dovecot.conf, which allows local users to obtain the ssl_key_password parameter value.
Gentoo Linux Security Advisory GLSA 200812-16 - Multiple vulnerabilities were found in the Dovecot mailserver. Versions less than 1.1.7-r1 are affected.