41. BootGuard TOCTOU

Description:

Insufficient input validation in MdeModulePkg in EDKII may allow an unauthenticated user to potentially enable escalation of privilege, denial of service and/or information disclosure via physical access.

Impact

Escalation of Privilege, Information Disclosure and/or Denial of Service

Severity

Medium 7.1 CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Recommendation:

EDK II commits:

• https://github.com/tianocore/edk2-staging/tree/BootGuardTocTouVulnerabilityMitigation

Patches:

• https://bugzilla.tianocore.org/attachment.cgi?id=316

Readme:

• https://github.com/tianocore/edk2-staging/blob/BootGuardTocTouVulnerabilityMitigation/Readme.md

Acknowledgments:

Trammel Hudson and Peter Bosch

References:

CVE-2019-11098

EDK II Bugzilla #1614