=========================================================================Ubuntu Security Notice USN-4010-1
June 05, 2019

exim4 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10
- Ubuntu 18.04 LTS

Summary:

Exim could be made to run commands if it received specially crafted network
traffic.

Software Description:
- exim4: Exim is a mail transport agent

Details:

It was discovered that Exim incorrectly handled certain decoding
operations. A remote attacker could possibly use this issue to execute
arbitrary commands.

Update instructions:

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

Ubuntu 18.10:
  exim4-daemon-heavy              4.91-6ubuntu1.1
  exim4-daemon-light              4.91-6ubuntu1.1

Ubuntu 18.04 LTS:
  exim4-daemon-heavy              4.90.1-1ubuntu1.2
  exim4-daemon-light              4.90.1-1ubuntu1.2

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

References:
  https://ubuntu.com/security/notices/USN-4010-1
  CVE-2019-10149

Package Information:
  https://launchpad.net/ubuntu/+source/exim4/4.91-6ubuntu1.1
  https://launchpad.net/ubuntu/+source/exim4/4.90.1-1ubuntu1.2