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XCCDF
Guide to the Secure Configuration of Ubuntu 18.04
System Settings
Installing and Maintaining Software
GNOME Desktop Environment
Configure GNOME Login Screen
Disable XDMCP in GDM
Disable XDMCP in GDM
An XCCDF Rule
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Disable XDMCP in GDM
High Severity
XDMCP is an unencrypted protocol, and therefore, presents a security risk, see e.g.
XDMCP Gnome docs
. To disable XDMCP support in Gnome, set
Enable
to
false
under the
[xdmcp]
configuration section in
/etc/gdm/custom.conf
. For example:
[xdmcp] Enable=false