A security issue affects the following Ubuntu releases:
This advisory also applies to the corresponding versions of
Kubuntu, Edubuntu, and Xubuntu.
The problem can be corrected by upgrading your system to the
following package versions:
In general, a standard system upgrade is sufficient to effect the
It was discovered that certain email headers were not correctly handled
by Dovecot. If a remote attacker sent a specially crafted email to a
user with a mailbox managed by Dovecot, that user's mailbox would become
inaccessible through Dovecot, leading to a denial of service.