USN-3881-1: Dovecot vulnerability

5 February 2019

dovecot vulnerability

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

  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Dovecot could be made to expose sensitive information over the network.

Software Description

  • dovecot - IMAP and POP3 email server

Details

It was discovered that Dovecot incorrectly handled client certificates. A remote attacker in possession of a valid certificate with an empty username field could possibly use this issue to impersonate other users.

Update instructions

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

Ubuntu 18.10
dovecot-core - 1:2.3.2.1-1ubuntu3.1
Ubuntu 18.04 LTS
dovecot-core - 1:2.2.33.2-1ubuntu4.2
Ubuntu 16.04 LTS
dovecot-core - 1:2.2.22-1ubuntu2.9
Ubuntu 14.04 LTS
dovecot-core - 1:2.2.9-1ubuntu2.5

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