'Entirely new class'
Well, it's true that it's NOT an entirely new class of attack. It's somewhat similar to the old TIOCSTI/TIOCNOTTY (a.k.a ttydev) attack on UNIX, and related attacks against x-windows (ask a certain UMCP sysadmin about xhost -- I think his systems were rooted by every hacker at the place)
This one's even broader in scope, though -- those only gave you control of the running program. This gives you full access AS the running program.
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