xserver-xorg-core: Root Compromise -- Existing Account

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

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

                               ESB-2018.3322
                       X.Org X server vulnerability
                              29 October 2018

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

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

Product:           xserver-xorg-core
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-14665  

Reference:         ESB-2018.3303
                   ESB-2018.3282

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3802-1

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

==========================================================================
Ubuntu Security Notice USN-3802-1
October 26, 2018

xorg-server, xorg-server-hwe-16.04 vulnerability
==========================================================================

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

- - Ubuntu 18.10
- - Ubuntu 18.04 LTS
- - Ubuntu 16.04 LTS

Summary:

X.Org X server could be made to overwrite files as the administrator.

Software Description:
- - xorg-server: X.Org X11 server
- - xorg-server-hwe-16.04: X.Org X11 server

Details:

Narendra Shinde discovered that the X.Org X server incorrectly handled
certain command line parameters when running as root with the legacy
wrapper. When certain graphics drivers are being used, a local attacker
could possibly use this issue to overwrite arbitrary files and escalate
privileges.

Update instructions:

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

Ubuntu 18.10:
  xserver-xorg-core               2:1.20.1-3ubuntu2.1

Ubuntu 18.04 LTS:
  xserver-xorg-core               2:1.19.6-1ubuntu4.2

Ubuntu 16.04 LTS:
  xserver-xorg-core-hwe-16.04     2:1.19.6-1ubuntu4.1~16.04.2

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3802-1
  CVE-2018-14665

Package Information:
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.1-3ubuntu2.1
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.19.6-1ubuntu4.2

https://launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/2:1.19.6-1ubuntu4.1~16.04.2

- --------------------------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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=O0rt
-----END PGP SIGNATURE-----