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Ubuntu Security Notice USN-3499-1
November 29, 2017

exim4 vulnerability
==========================================================================

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

– Ubuntu 17.10
– Ubuntu 17.04

Summary:

Exim could be made to crash 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 BDAT data headers.
A remote attacker could possibly use this issue to cause Exim to crash,
resulting in a denial of service.

Update instructions:

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

Ubuntu 17.10:
exim4-daemon-heavy 4.89-5ubuntu1.2
exim4-daemon-light 4.89-5ubuntu1.2

Ubuntu 17.04:
exim4-daemon-heavy 4.88-5ubuntu1.3
exim4-daemon-light 4.88-5ubuntu1.3

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

References:
https://www.ubuntu.com/usn/usn-3499-1
CVE-2017-16944

Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.89-5ubuntu1.2
https://launchpad.net/ubuntu/+source/exim4/4.88-5ubuntu1.3

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