X Server Detection
Low Nessus Plugin ID 10407
SynopsisAn X11 server is listening on the remote host
DescriptionThe remote host is running an X11 server. X11 is a client-server protocol that can be used to display graphical applications running on a given host on a remote client.
Since the X11 traffic is not ciphered, it is possible for an attacker to eavesdrop on the connection.
SolutionRestrict access to this port. If the X11 client/server facility is not used, disable TCP support in X11 entirely (-nolisten tcp).