ESB-2019.0331 - [Ubuntu] dovecot: Access confidential data - Remote/unauthenticated 2019-02-06

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0331
                           Dovecot vulnerability
                              6 February 2019

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           dovecot
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-3814  

Reference:         ESB-2019.0330

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3881-1
   http://www.ubuntu.com/usn/usn-3881-2

Comment: This bulletin contains two (2) Ubuntu security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

==========================================================================
Ubuntu Security Notice USN-3881-1
February 05, 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

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

References:
  https://usn.ubuntu.com/usn/usn-3881-1
  CVE-2019-3814

Package Information:
  https://launchpad.net/ubuntu/+source/dovecot/1:2.3.2.1-1ubuntu3.1
  https://launchpad.net/ubuntu/+source/dovecot/1:2.2.33.2-1ubuntu4.2
  https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.9
  https://launchpad.net/ubuntu/+source/dovecot/1:2.2.9-1ubuntu2.5

- --------------------------------------------------------------------------------

==========================================================================
Ubuntu Security Notice USN-3881-2
February 05, 2019

dovecot vulnerability
==========================================================================

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

- - Ubuntu 12.04 ESM

Summary:

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

Software Description:
- - dovecot: IMAP and POP3 email server

Details:

USN-3881-1 fixed a vulnerability in Dovecot. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory 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 12.04 ESM:
   dovecot-core                    1:2.0.19-0ubuntu2.6

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

References:
   https://usn.ubuntu.com/usn/usn-3881-2
   https://usn.ubuntu.com/usn/usn-3881-1
   CVE-2019-3814

- --------------------------END INCLUDED TEXT--------------------

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