Researchers have found three vulnerabilities in AMI MegaRAC, a baseband management controller (BMC) firmware used by multiple server manufacturers. If exploited, the flaws could allow attackers to remotely control servers, deploy malware and firmware implants, or trigger damaging actions that leave them inoperable.

BMCs are microcontrollers present on server motherboards that have their own firmware, dedicated memory, power, and network ports and are used for out-of-band management of servers when their main operating systems are shut down. They are essentially small independent computers running inside bigger computers that allow administrators to remotely perform a variety of maintenance and diagnostic tasks including reinstalling operating systems, restarting servers when they’re unresponsive, deploying firmware updates and more.

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