USN-4110-4: Dovecot regression

28 August 2019

dovecot regression

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

  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM


USN-4110-1 introduced a regression in Dovecot.

Software Description

  • dovecot - IMAP and POP3 email server


USN-4110-1 fixed a vulnerability in Dovecot. The update introduced a regression causing a wrong check. This update fixes the problem for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

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 14.04 ESM
dovecot-core - 1:2.2.9-1ubuntu2.6+esm2
Ubuntu 12.04 ESM
dovecot-core - 1:2.0.19-0ubuntu2.8

To update your system, please follow these instructions:

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