=========================================================================Ubuntu Security Notice USN-1295-1
December 08, 2011

dovecot vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.10

Summary:

Dovecot could be made to expose sensitive information over the network.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

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.

Update instructions:

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:
  https://ubuntu.com/security/notices/USN-1295-1
  CVE-2011-4318

Package Information:
  https://launchpad.net/ubuntu/+source/dovecot/1:2.0.13-1ubuntu3.2