Ubuntu Security Notice USN-3556-1
1st February, 2018
A security issue affects these releases of Ubuntu and its
- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Dovecot could be made to crash if it received specially crafted input.
– IMAP and POP3 email server
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
- Ubuntu 17.10:
- Ubuntu 16.04 LTS:
- Ubuntu 14.04 LTS:
To update your system, please follow these instructions:
In general, a standard system update will make all the necessary changes.