X.Org X Server: Privilege escalation

Background

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

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:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.20.11"