Insyde Software Security Advisory

Insyde ID Advisory Category Impact of Vulnerability Severity Rating Original Date Last Revised
INSYDE-SA-2021001 Software Improper Privilege Management 6.7 06/14/2021 11/29/2021

Summary:

In the kernel in InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory.

Vulnerability Details

CVE-2020-27339

Description: In the kernel in InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5).

CVSS Base Score: 6.7 Medium

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Recommendations:

  • Contact Insyde Software for an updated version of the affected products
  • Insyde Software recommends that users contact hardware manufacturers to get updated version of the BIOS flash package.

Acknowledgements:

Insyde would like to thank security researcher Evgenii Rasskazov for reporting this issue.

Revision History:

Revision Date Description
1.0 15-June-2021 Initial Release
1.1 02-July-2021 Corrected CVE Link/Date
1.2 29-November-2021 Updated CVE Description

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