Exploring treasures of 77FEh

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by Vlatko Kosturjak

If vendors need to expose serial interface to “modern” IP world, they often use ready-made solution like Lantronix. You can find different vendors to use these devices as part of different embedded systems – from alarms to legacy industrial systems. If you find such devices on the Internet or LAN, the most imporant part is to check if 77FEh is enabled. We will cover already known stuff with 77FEh, but also new interesting findings in owning such devices.Tool to exploit all of this will be presented as well as counter-measures.