PT-2022-21898 · Insyde · Insydeh2O Uefi Firmware

Published 2022-11-14 · Updated 2023-02-14 · CVE-2022-33906

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions InsydeH2O UEFI firmware kernel versions prior to 5.2: 05.27.23 InsydeH2O UEFI firmware kernel versions prior to 5.3: 05.36.23 InsydeH2O UEFI firmware kernel versions prior to 5.4: 05.44.23 InsydeH2O UEFI firmware kernel versions prior to 5.5: 05.52.23

Description The issue arises from DMA transactions targeting input buffers used by the FwBlockServiceSmm software SMI handler, potentially causing SMRAM corruption through a Time-of-Check-to-Time-of-Use (TOCTOU) attack. This was discovered by Insyde engineering based on a description from Intel's iSTARE group.

Recommendations For kernel version 5.2, update to version 05.27.23 or later. For kernel version 5.3, update to version 05.36.23 or later. For kernel version 5.4, update to version 05.44.23 or later. For kernel version 5.5, update to version 05.52.23 or later.

Fix

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

CVE-2022-33906

Affected Products

Insydeh2O Uefi Firmware

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2022-33906 · Security Note
• https://osv.dev/vulnerability/CVE-2022-33906 · Vendor Advisory
• https://insyde.com/security-pledge/SA-2022048 · Vendor Advisory
• https://insyde.com/security-pledge · Vendor Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-450613.pdf · Note