SMM memory corruption via unchecked BIOS Guard offsets
Published Apr 11, 2023 · Updated Feb 11, 2025
Out-of-bounds write in InsydeH2O kernel 5.0 through 5.5 allows local users to corrupt SMM memory through a malformed BIOS Guard update. ChipsetSvcSmm reads InputDataBuffer from RSI without checking whether it overlaps SMRAM, then derives BgupcOffset from attacker-controlled section sizes and uses it to copy certificate and update data. Exploitation requires local low-privileged access to invoke the BIOS Guard SMI handler; resulting writes can corrupt privileged SMRAM without user interaction.
Summary
What happened
Out-of-bounds write in InsydeH2O kernel 5.0 through 5.5 allows local users to corrupt SMM memory through a malformed BIOS Guard update. ChipsetSvcSmm reads InputDataBuffer from RSI without checking whether it overlaps SMRAM, then derives BgupcOffset from attacker-controlled section sizes and uses it to copy certificate and update data. Exploitation requires local low-privileged access to invoke the BIOS Guard SMI handler; resulting writes can corrupt privileged SMRAM without user interaction.
The record
- CVE
- CVE-2023-22614
- Published
- Apr 11, 2023
- Updated
- Feb 11, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 11, 2023CVE publishedPublication date reported by the CVE source.
- Feb 11, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Stepping Insyde System Management Modeproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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