CVE-2020-5953 Information

Description

A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code located in SWSMI handler that dereferences gRT (EFI_RUNTIME_SERVICES) pointer to call a GetVariable service which is located outside of SMRAM. This can result in code execution in SMM (escalating privilege from ring 0 to ring -2).

CVSS Vector

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

Reference

https://www.insyde.com/security-pledge https://www.insyde.com/products https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf https://security.netapp.com/advisory/ntap-20220222-0005/

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.5