[USN-3881-1] Dovecot vulnerability

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==========================================================================
Ubuntu Security Notice USN-3881-1
February 05, 2019

dovecot vulnerability
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

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 handled client certificates. A
remote attacker in possession of a valid certificate with an empty username
field could possibly use this issue to impersonate other users.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.10:
dovecot-core 1:2.3.2.1-1ubuntu3.1

Ubuntu 18.04 LTS:
dovecot-core 1:2.2.33.2-1ubuntu4.2

Ubuntu 16.04 LTS:
dovecot-core 1:2.2.22-1ubuntu2.9

Ubuntu 14.04 LTS:
dovecot-core 1:2.2.9-1ubuntu2.5

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3881-1
CVE-2019-3814

Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.2.1-1ubuntu3.1
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.33.2-1ubuntu4.2
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.9
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.9-1ubuntu2.5