USN-3556-1: Dovecot vulnerability

Ubuntu Security Notice USN-3556-1

1st February, 2018

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

Dovecot could be made to crash if it received specially crafted input.

It was discovered that Dovecot incorrectly handled certain authentications.
An attacker could possibly use this to cause a denial of service.

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

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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