Description:

The function SmmFaultTolerantWriteHandler did not correctly validate inputs. This could result in an overwrite of SMRAM.

Recommendation:

This issue is addressed by EDK2 SVN https://sourceforge.net/p/edk2/code/13518 and https://sourceforge.net/p/edk2/code/13763.

Acknowledgments:

Reported by the Advanced Threat Research team at Intel Security.