CVE-2020-27339 Information

Description

In the kernel in Insyde 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 Vector

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

Reference

https://www.insyde.com/security-pledge/SA-2021001 https://security.netapp.com/advisory/ntap-20220216-0005/ https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

6.7