X11 Server Unauthenticated Access

This script is Copyright (C) 2005-2012 Tenable Network Security, Inc.

Synopsis :

The remote X11 server accepts connections from anywhere.

Description :

The remote X11 server accepts connection from anywhere. An attacker
may connect to it to eavesdrop on the keyboard and mouse events of
a user on the remote host. It is even possible for an attacker to
grab a screenshot of the remote host or to display arbitrary programs.

An attacker may exploit this flaw to obtain the username and password
of a user on the remote host.

Solution :

Restrict access to this port by using the 'xhost' command.
If the X11 client/server facility is not used, disable TCP entirely.

Risk factor :

Critical / CVSS Base Score : 10.0
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 19948 ()

Bugtraq ID:

CVE ID: CVE-1999-0526