Question: This case pertains to a Lenovo Exploit in which the attacker creates a buffer in the memory containing exploit code to be executed in the
This case pertains to a Lenovo Exploit in which the attacker creates a buffer in the memory containing exploit code to be executed in the system management mode SMM The attacker then creates a structure with a pointer to the exploit codes entry point and triggers a System Management Interrupt SMI passing a reference to that structure. SMM driver then calls the exploit code via the supplied function pointer. A vulnerability exists in the system management mode BIOS Extensible Firmware Interface EFI driver as it allows local administrator to execute arbitrary code with SMM privileges via unspecified vectors. Other know conditions include: the attacker must be able to execute kernel level code on the system. The vulnerability is built into the BIOS and, therefore, it is always there. There is no user configuration required. Normally the contents of SMRAM are hidden by hardware from access by kernel level code. This attack allows full disclosure of the precise content of SMRAM.
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