2.1.2 Ensure X Window System is not installed


The X Window System provides a Graphical User Interface (GUI) where users can have multiple windows in which to run programs and various add on. The X Windows system is typically used on workstations where users login, but not on servers where users typically do not login.


Unless your organization specifically requires graphical login access via X Windows, remove it to reduce the potential attack surface.


Many Linux systems run applications which require a Java runtime. Some Linux Java packages have a dependency on specific X Windows xorg-x11-fonts. One workaround to avoid this dependency is to use the 'headless' Java packages for your specific Java runtime, if provided by your distribution.


An OS image update that does not include X Window System is required.

See Also