SSH Users beware: The hazards of X11 forwarding
"Enter SSH, a wonderful encrypted remote login/file transfer/port forwarding/you name it protocol. You probably use it when you log into to other Linux machines, such as your shell server, email account, etc. SSH has the ability to tunnel X11 connections through it - this feature is called X11 Forwarding. In brief, if you are on your desktop attached to an X11 display (you can run xclock for example) then when you SSH to a different machine, it can tunnel X11 over the connection. You can run graphical X11 applications on the remote machine, but they display back on your desktop."
(Submitted by Noel Sun Jul 11, 2004 )
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