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People bring this up sometimes, but I've never heard of this being used in any real attack/malware. It appears to be a purely theoretical threat.



Broad-spectrum attacks on our global information infrastructure appeared to be purely theoretical until Snowden published.


What are you referring to?


It's an obvious reference to NSA's programs for intercepting various information


http://www.hackinglinuxexposed.com/articles/20040705.html

This is why ssh X forwarding disabled by default.




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