Firmware memory tampering via unchecked output size
Published Apr 12, 2023 · Updated Mar 19, 2025
Buffer overflow in IhisiSmm in Insyde InsydeH2O kernel 5.0 through 5.5 allows local users to corrupt adjacent command-buffer data. IHISI function 0x17 checks that the output buffer begins inside the command buffer, but GetFlashTable writes into it before DataSize is validated, allowing the write to pass the buffer end. Reaching the software SMI path requires local high privileges, and successful exploitation tampers with firmware-managed memory rather than disclosing data or interrupting service.
Summary
What happened
Buffer overflow in IhisiSmm in Insyde InsydeH2O kernel 5.0 through 5.5 allows local users to corrupt adjacent command-buffer data. IHISI function 0x17 checks that the output buffer begins inside the command buffer, but GetFlashTable writes into it before DataSize is validated, allowing the write to pass the buffer end. Reaching the software SMI path requires local high privileges, and successful exploitation tampers with firmware-managed memory rather than disclosing data or interrupting service.
The record
- CVE
- CVE-2022-24350
- Published
- Apr 12, 2023
- Updated
- Mar 19, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Apr 12, 2023CVE publishedPublication date reported by the CVE source.
- Mar 19, 2025Record updatedLatest update available in the CVE record.
Exploitability
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Published CVSS scores
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Attacks
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Technologies
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