Security researchers have found a way to corrupt the firmware of a critical component usually found in servers to turn the systems into an unbootable hardware assembly. The recovery procedure requires physical intervention to replace the malicious firmware.
Achieving this is done via regular tools used to keep the baseboard management controller (BMC) up to date.
BMCs are specialized microcontrollers (more like independent micro-computers) embedded on virtually all server motherboards; they are also present in high-end switches, JBOD (just a bunch of disks) and JBOF (just a bunch of flash) types of storage systems.
By Ionut Ilascu
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