ESB-2017.3036 - [UNIX/Linux][Ubuntu] exim4: Denial of service - Remote/unauthenticated 2017-11-30

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3036
                            Exim vulnerability
                             30 November 2017

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

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

Product:           exim4
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-16944  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3499-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running exim4 check for an updated version of the software for their
         operating system.

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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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