Debian DSA-1516-1 : dovecot - privilege escalation

Prior to this update, the default configuration for Dovecot used by Debian runs the server daemons with group mail privileges. This means that users with write access to their mail directory on the server for example, through an SSH login could read and also delete via a symbolic link mailboxes...

DSA-1516-1 dovecot - privilege escalation

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Dovecot mail_extra_groups setting is often used insecurely

mailextragroups=mail setting is often used insecurely to give Dovecot access to create dotlocks to /var/mail directory. If you don't use mboxes in /var/mail, make sure this setting is cleared. If you do use /var/mail mboxes and Dovecot gives permission errors without it, do one of the following i...