GLSA 201810-09: X.Org X Server: Privilege escalation

http://security.gentoo.org/

Severity:	high
Title:	X.Org X Server: Privilege escalation
Date:	10/30/2018
Bugs:	#669588
ID:	201810-09

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	Architecture(s)
x11-base/xorg-server	< 1.20.3	>= 1.20.3	All supported architectures

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

CVE-2018-14665

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201810-09.xml

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.