CVE-2023-34195

moderate-risk
Published 2023-09-18

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.

Do I need to act?

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0.12% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.8/10 High
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Insyde

References (4)

Vendor Advisory https://www.insyde.com/security-pledge
Vendor Advisory https://www.insyde.com/security-pledge/SA-2023052
Vendor Advisory https://www.insyde.com/security-pledge
Vendor Advisory https://www.insyde.com/security-pledge/SA-2023052
30
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal