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Ubuntu Security Notice USN-3164-1
January 05, 2017

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

– Ubuntu 16.10
– Ubuntu 16.04 LTS
– Ubuntu 14.04 LTS
– Ubuntu 12.04 LTS

Summary:

Exim could be made to expose private DKIM signing keys.

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

Details:

Bjoern Jacke discovered that Exim incorrectly handled DKIM keys. In certain
configurations, private DKIM signing keys could be leaked to the log files.

Update instructions:

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

Ubuntu 16.10:
exim4-daemon-heavy 4.87-3ubuntu1.1
exim4-daemon-light 4.87-3ubuntu1.1

Ubuntu 16.04 LTS:
exim4-daemon-heavy 4.86.2-2ubuntu2.1
exim4-daemon-light 4.86.2-2ubuntu2.1

Ubuntu 14.04 LTS:
exim4-daemon-heavy 4.82-3ubuntu2.2
exim4-daemon-light 4.82-3ubuntu2.2

Ubuntu 12.04 LTS:
exim4-daemon-heavy 4.76-3ubuntu3.4
exim4-daemon-light 4.76-3ubuntu3.4

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

References:
http://www.ubuntu.com/usn/usn-3164-1
CVE-2016-9963

Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.87-3ubuntu1.1
https://launchpad.net/ubuntu/+source/exim4/4.86.2-2ubuntu2.1
https://launchpad.net/ubuntu/+source/exim4/4.82-3ubuntu2.2
https://launchpad.net/ubuntu/+source/exim4/4.76-3ubuntu3.4

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