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What are the issues about X11 through a firewall?
Java Security,Windows code security, Windows Server 2003 Security,Internet Explorer 7 Security and Internet Firewalls questions and answers
(Continued from previous question...)
What are the issues about X11 through a firewall?
The X Windows System is a very useful system, but unfortunately has some major security flaws. Remote systems that can gain or spoof access to a workstation's X11 display can monitor keystrokes that a user enters, download copies of the contents of their windows, etc.
While attempts have been made to overcome them (E.g., MIT ``Magic Cookie'') it is still entirely too easy for an attacker to interfere with a user's X11 display. Most firewalls block all X11 traffic. Some permit X11 traffic through application proxies such as the DEC CRL X11 proxy (FTP crl.dec.com). The firewall toolkit includes a proxy for X11, called x-gw, which a user can invoke via the Telnet proxy, to create a virtual X11 server on the firewall. When requests are made for an X11 connection on the virtual X11 server, the user is presented with a pop-up asking them if it is OK to allow the connection. While this is a little unaesthetic, it's entirely in keeping with the rest of X11.
(Continued on next question...)
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