USN-4110-3: Dovecot regression

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

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.

References

Source: USN-4110-3: Dovecot regression

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