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[gentoo-announce] [ GLSA 201810-09 ] X.Org X Server: Privilege escalation

Posted on 30 October 2018
Gentoo-announce

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From: Thomas Deutschmann <whissi@gentoo.org>
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To: gentoo-announce@lists.gentoo.org
Message-ID: <7621da04-748a-6352-77e0-07667b771827@gentoo.org>
Subject: [ GLSA 201810-09 ] X.Org X Server: Privilege escalation

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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


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