2.2.2 Ensure X11 Server components are not installed

Information

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.

Rationale:

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

Impact:

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.

Solution

Run the following command to remove the X Windows Server packages:

# yum remove xorg-x11-server*

See Also

https://workbench.cisecurity.org/files/3148

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-11, CSCv7|2.6

Plugin: Unix

Control ID: ae3907016d76f4ebc4bbbf4672b64b5a47f6d94244bfcef6027f0e5bcbc2d74a