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Two never-before-seen tools, from same group, infect air-gapped devices
(arstechnica.com)
This is a most excellent place for technology news and articles.
CDs have an advantage over USB drives in that they can't actually secretly be USB HID devices like a fake keyboard or mouse that runs a bunch of commands when it plugs in. It's only a storage device.
A super secure environment might then lock down all USB devices to ones known by them and then epoxy all ports and devices.