[ GLSA 201810-09 ] X.Org X Server

[GLSA]

Gentoo Linux Security Advisory

Title: X.Org X Server: Privilege escalation (GLSA 201810-09)
Severity: high
Exploitable: local
Date: 2018-10-30
Bug(s): #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: x11-base/xorg-server
Vulnerable: < 1.20.3
Unaffected: >= 1.20.3
Architectures: 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: