[USN-3587-1] Dovecot vulnerabilities

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-3587-1
March 05, 2018

dovecot vulnerabilities
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Dovecot.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

It was discovered that Dovecot incorrectly handled parsing certain email
addresses. A remote attacker could use this issue to cause Dovecot to
crash, resulting in a denial of service, or possibly obtain sensitive
information. (CVE-2017-14461)

It was discovered that Dovecot incorrectly handled TLS SNI config lookups.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2017-15130)

Update instructions:

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

Ubuntu 17.10:
  dovecot-core                    1:2.2.27-3ubuntu1.3

Ubuntu 16.04 LTS:
  dovecot-core                    1:2.2.22-1ubuntu2.7

Ubuntu 14.04 LTS:
  dovecot-core                    1:2.2.9-1ubuntu2.4

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

References:
  https://usn.ubuntu.com/usn/usn-3587-1
  CVE-2017-14461, CVE-2017-15130

Package Information:
  https://launchpad.net/ubuntu/+source/dovecot/1:2.2.27-3ubuntu1.3
  https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.7
  https://launchpad.net/ubuntu/+source/dovecot/1:2.2.9-1ubuntu2.4

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