CVE-2023-34195

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-09-18 · updated 2026-06-17
Weakness: CWE-94

Description

An issue was discovered in SystemFirmwareManagementRuntimeDxe in Insyde InsydeH2O with kernel 5.0 through 5.5. The implementation of the GetImage method retrieves the value of a runtime variable named GetImageProgress, and later uses this value as a function pointer. This variable is wiped out by the same module near the end of the function. By setting this UEFI variable from the OS to point into custom code, an attacker could achieve arbitrary code execution in the DXE phase, before several chipset locks are set.

Affected products

Insydeh2O: from 5.2 before 5.2.05.28.22; from 5.3 before 5.3.05.37.22; from 5.4 before 5.4.05.45.22; from 5.5 before 5.5.05.53.22; from 5.6 before 5.6.05.60.22 — fixed in 5.2.05.28.22, 5.3.05.37.22, 5.4.05.45.22, 5.5.05.53.22, 5.6.05.60.22

How to fix

Upgrade to a fixed version: Insydeh2O 5.2.05.28.22, 5.3.05.37.22, 5.4.05.45.22, 5.5.05.53.22. Check the vendor advisory for mitigations.

References

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