The shred utility will attempt to ensure that the device'sserial number is written to the disk. Depending on the hardware, itseems that the serial number is written anywhere from a few hundredbytes to the entire disk. The default option is as follows:
The process of gaining access to a remote BMC is straightforward. If the BMC supports IPMI, it will provide access to the BMC's IPMI console through a configuration file that allows a remote shell. If an attacker controls the serial port that the BMC uses, it becomes trivial to set up port forwarding on the remote machine to provide remote access to the BMC. In either case, the attacker will be able to log in to the BMC using the username and password of the administrator. In the case of IPMI, this is typically the default administrator's credentials or can be retrieved via the admin web user interface if the administrator is logged into the BMC.
Once the attacker has access to the BMC, it's time to play around and find out which commands work and which don't. BMCs are usually implemented using a stack of discrete components that provide the different functionalities of the device. The following diagram shows the stack for an HP ProLiant 6500 and a Dell PowerVault.
Although it's unlikely that an attacker will get physical access to a network device, many network devices will allow remote access to the device via the serial port or some form of virtual serial port using software like telnet. Some models allow remote access to the IPMI even if it's a physical console port, and the BMC will forward any IPMI requests to the remote device. Thankfully, many IPMI models don't allow direct remote access. The table below summarizes the access methods for the most common BMCs. For BMCs with multiple ports, the summary assumes that all ports are equivalent. For instance, an IPMI model with three IPMI ports but two IPMI port admins is summarized as two ports.
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