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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.

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Vulnerability Assessment Details

Open X11 Server

Vulnerability Assessment Summary
X11 determines if X11 is open

Detailed Explanation for this Vulnerability Assessment

Summary :

The remote X11 server accepts connections from anywhere.

Description :

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

A possible hacker 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.

Network Security Threat Level:

Medium / CVSS Base Score : 4
(AV:R/AC:L/Au:NR/C:P/A:N/I:N/B:C)

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Tenable Network Security

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