-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3006
                            Exim vulnerability
                             28 November 2017

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

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

Product:           exim4
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-16943  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3493-1

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. Please note: There is exploit code publically 
         available for this vulnerablity.

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-3493-1: Exim vulnerability

Ubuntu Security Notice USN-3493-1

27th November, 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 or run programs if it received specially crafted 
network traffic.

Software description

exim4 - Exim is a mail transport agent

Details

It was discovered that Exim incorrectly handled memory in the ESMTP

CHUNKING extension. A remote attacker could use this issue to cause Exim to

crash, resulting in a denial of service, or possibly execute arbitrary

code. The default compiler options for affected releases should reduce the

vulnerability to a denial of service.

Update instructions

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

Ubuntu 17.10:

exim4-daemon-heavy 4.89-5ubuntu1.1

exim4-daemon-light 4.89-5ubuntu1.1

Ubuntu 17.04:

exim4-daemon-heavy 4.88-5ubuntu1.2

exim4-daemon-light 4.88-5ubuntu1.2

To update your system, please follow these instructions: 
https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2017-16943

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=zpV/
-----END PGP SIGNATURE-----