X11 Server Unauthenticated Access

This script is Copyright (C) 2005-2016 Tenable Network Security, Inc.


Synopsis :

The remote X11 server accepts connections from anywhere.

Description :

The remote X11 server accepts connections from anywhere. An attacker
can 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 can 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
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 19948 ()

Bugtraq ID:

CVE ID: CVE-1999-0526