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EDK II Untested memory not covered by SMM page protection

Intel ID:
INTEL-SA-00159
Product family:
Firmware Based on Tianocore
Impact of vulnerability:
Escalation of Privilege, Information Disclosure
Severity rating:
Important
Original release:
07/10/2018
Last revised:
07/10/2018

Summary:

Intel is releasing firmware updates to improve System Management Mode (SMM) protection.

Description:

Incorrect handling of memory types in Tianocore firmware potentially allows a local attacker to bypass SMM protections on memory.
•  High 8.2 CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products:

Firmware based on Tianocore
•    MdePkg
•    UefiCpuPkg
•    MdeModulePkg

Recommendations:

Intel recommends that end-users contact their system manufacturers for updated system firmware.
•    Patches for Tianocore are listed in the Tianocore Security Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=751
•    Intel has released updated firmware to address this issue: https://github.com/otcshare/CCG-CNLCFLGenericFull/commit/b7463d0ec1d57c625094f7ade1831c23cdf8f664

Acknowledgements:

The issue was reported through TianoCore Bugzilla. 

Revision History

Revision Date Description
1.0 07/10/2018 Initial Release

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