uefi_variable_reinstallation.md

3. UEFI Variable “Reinstallation” {#uefi-variable-reinstallation}

Description:

It had been possible to call the SetVariable API at runtime on a variable that did not have RUNTIME_ACCESS permission, causing a new variable with the same name/GUID to be created. It was possible for this new variable to be used instead of the original, protected variable.

Recommendation:

This issue is addressed by EDK2 SVN https://sourceforge.net/p/edk2/code/13156.

Acknowledgments:

Reported by the Advanced Threat Research team at Intel Security.