USN-3928-1: Dovecot vulnerability

1 April 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


Dovecot could be made to crash or run programs as an administrator if it opened a specially crafted file.

Software Description

  • dovecot - IMAP and POP3 email server


It was discovered that Dovecot incorrectly handled reading certain headers from the index. A local attacker could possibly use this issue to escalate privileges.

Update instructions

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

Ubuntu 18.10
dovecot-core - 1:
Ubuntu 18.04 LTS
dovecot-core - 1:
Ubuntu 16.04 LTS
dovecot-core - 1:2.2.22-1ubuntu2.10
Ubuntu 14.04 LTS
dovecot-core - 1:2.2.9-1ubuntu2.6

To update your system, please follow these instructions:

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