[ GLSA 202104-02 ] X.Org X Server

[GLSA]

Gentoo Linux Security Advisory

Title: X.Org X Server: Privilege escalation (GLSA 202104-02)
Severity: high
Exploitable: local, remote
Date: 2021-04-30
Bug(s): #782679
ID: 202104-02

Synopsis

A vulnerability in X.Org X Server may allow 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: < 1.20.11
Unaffected: >= 1.20.11
Architectures: All supported architectures


Description

It was discovered that X.Org X Server did not sufficiently check the
length of the XInput extension’s ChangeFeedbackControl request.


Impact

An authorized attacker could possibly escalate privileges, or cause a
Denial of Service condition.


Workaround

There is no known workaround at this time.

Resolution

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