ESB-2018.3322 - [Ubuntu] xserver-xorg-core: Root compromise - Existing account 2018-10-29

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             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

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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

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