========================================================================== Ubuntu Security Notice USN-1295-1 December 08, 2011
A security issue affects these releases of Ubuntu and its derivatives:
Dovecot could be made to expose sensitive information over the network.
Software Description: - dovecot: IMAP and POP3 email server
It was discovered that Dovecot incorrectly validated certificate hostnames when being used as a POP3 and IMAP proxy. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could be exploited to view sensitive information.
The problem can be corrected by updating your system to the following package versions:
Ubuntu 11.10: dovecot-common 1:2.0.13-1ubuntu3.2
In general, a standard system update will make all the necessary changes.
References: http://www.ubuntu.com/usn/usn-1295-1 CVE-2011-4318
Package Information: https://launchpad.net/ubuntu/+source/dovecot/1:2.0.13-1ubuntu3.2