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Gentoo Linux Security Advisory                           GLSA 201810-09
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                                           https://security.gentoo.org/
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 Severity: High
    Title: X.Org X Server: Privilege escalation
     Date: October 30, 2018
     Bugs: #669588
       ID: 201810-09

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Synopsis
=======
A vulnerability in X.Org X Server allows local users to escalate
privileges.

Background
=========
The X Window System is a graphical windowing system based on a
client/server model.

Affected packages
================
    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  x11-base/xorg-server         < 1.20.3                  >= 1.20.3

Description
==========
An incorrect permission check for -modulepath and -logfile options when
starting Xorg. X server allows unprivileged users with the ability to
log in to the system via physical console to escalate their privileges
and run arbitrary code under root privileges.

Impact
=====
A local attacker can escalate privileges to root by passing crafted
parameters to the X.org X server.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All X.Org X Server users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.20.3"

References
=========
[ 1 ] CVE-2018-14665
      https://nvd.nist.gov/vuln/detail/CVE-2018-14665

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/201810-09

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
======
Copyright 2018 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5/