An attacker who reaches UDP port 623 on a server’s baseboard management controller can ask it for a password hash and receive one before logging in. The exchange is part of the IPMI 2.0 handshake, built on an authentication protocol introduced in 2004. That controller runs underneath the operating system. It power-cycles the host, mounts virtual media, opens a remote console, and flashes firmware. Host security tools watch the layer above it. Example BMC web … More →

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