CVE-2021-33627 Information

Description

An issue was discovered in Insyde InsydeH2O 5.x affecting FwBlockServiceSmm. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid which allows use of SMRAM MMIO or OS kernel addresses

CVSS Vector

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

Reference

https://www.insyde.com/security-pledge https://www.insyde.com/security-pledge/SA-2022022 https://security.netapp.com/advisory/ntap-20220222-0002/ https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.2