https://bugs.kde.org/show_bug.cgi?id=395419

            Bug ID: 395419
           Summary: Xwayland listens on port 6000+n on all network
                    interfaces
           Product: kwin
           Version: 5.13.0
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: platform-x11-nested
          Assignee: kwin-bugs-n...@kde.org
          Reporter: itgvk...@grr.la
  Target Milestone: ---

In plasma wayland session Xwayland is started with default settings which means
it listens on tcp/tcp6 on all network interfaces on port 6000+n (n=display
number).

Listening on network without user consent is harmful for security. Especially
as it's not possible to disable this in config.

In X11 session all display managers start xserver with '-nolisten tcp' option
which disables above behavior.

Considering above I think current Xwayland config is decreasing security in
comparison to standalone X11 session and should be adjusted.

BTW: This behavior can create specific issues for some users:
https://bugs.kde.org/show_bug.cgi?id=394431

Steps to reproduce:
1. Login to plasma-wayland session
2. sudo ss -tunwrap | column -t

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