Home/CVE/An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. DMA attacks on the FwBlockServiceSmm shared buf
CVE

CVE-2022-32470

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. DMA attacks on the FwBlockServiceSmm shared buf

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. DMA attacks on the FwBlockServiceSmm shared buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges. This attack can be mitigated using IOMMU protection for the ACPI runtime memory used for the command buffer.

This attack can be mitigated by copying the firmware block services data to SMRAM before checking it.

HIGH · CVSS 7 EPSS 0.00069
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
▤

Affected Products & Versions

4
insyde insydeh2o>= 5.0 and < 5.2.05.27.27
insyde insydeh2o>= 5.3 and < 5.3.05.36.27
insyde insydeh2o>= 5.4 and < 5.4.05.44.27
insyde insydeh2o>= 5.5 and < 5.5.05.52.27
▣

Scoring & Timeline

7
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD15 Feb 2023 · 03:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
siemens-csafSSA-957369
cisa-csafcisa-csaf-csaf_files-OT-white-2023-icsa-23-257-04
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.insyde.com/security-pledgeVendor Advisory
https://www.insyde.com/security-pledge/SA-2023002Vendor Advisory
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