=========================================================================Ubuntu Security Notice USN-4110-3
August 28, 2019
Dovecot regression
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
USN-4110-1 introduced a regression in Dovecot.
Software Description:
- dovecot: IMAP and POP3 email server
Details:
USN-4110-1 fixed a vulnerability in Dovecot. The update introduced a
regression causing a wrong check. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly
handled certain data. An attacker could possibly use this issue
to cause a denial of service or execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 19.04:
dovecot-core 1:2.3.4.1-1ubuntu2.4
Ubuntu 18.04 LTS:
dovecot-core 1:2.2.33.2-1ubuntu4.5
Ubuntu 16.04 LTS:
dovecot-core 1:2.2.22-1ubuntu2.12
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4110-3
https://ubuntu.com/security/notices/USN-4110-1
CVE-2019-11500
Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.4.1-1ubuntu2.4
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.33.2-1ubuntu4.5
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.12