Revsersing UEFI SMM drives on Lenovo ThinkPads

Written by Bruno – 2020-01-14

Last summer, I finally started reversing the firmware of a computer I had since quite some times: a Lenovo ThinkPad P51s.[…]The problem of calling this function from SMM is that the EFI_BOOT_SERVICES is a table of services located in the normal world. An attacker can simply change the address in the EFI_BOOT_SERVICES table and get an arbitrary call. This type of vulnerability is usually named a callout of SMRAM and they are basically equivalent to calling userland code from kernelland.[…]

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