Managing X11 and CDE concerns

There are potential security vulnerabilities involved with the X11 X server and the Common Desktop Environment (CDE).

Removing the /etc/rc.dt file
Remove the /etc/rc.dt file on systems that require a high level of security.
Preventing unauthorized monitoring of remote X server
An important security issue associated with the X11 server is unauthorized silent monitoring of a remote server.
Enabling and disabling access control
The X server permits remote hosts to use the xhost + command to connect to your system.
Disabling user permissions to run the xhost command
You can prevent the unauthorized execution of the xhost command by using the chmod command.

Parent topic: Secure system installation and configuration