FMTSWriteUseIntelLib Buffer Overflow in SMM

Executive Summary

This vulnerability is a buffer overflow issue in the SMM IHISI command handler named FMTSWriteUseIntelLib. It affects FMTS command 0x32 and allows reading and writing data without proper buffer size checks, potentially leading to memory corruption.

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Detection Guidance

Detection requires checking InsydeH2O firmware versions and verifying if the vulnerable FMTSWriteUseIntelLib function exists in the SMM IHISI command handler for FMTS command 0x32. Insyde recommends confirming the firmware version is 2.7 or later, as the issue was resolved in updates.

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Impact Analysis

This vulnerability could allow an attacker with local access and high privileges to execute arbitrary code, escalate privileges, or cause system instability. It may lead to unauthorized data access or system crashes.

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Compliance Impact

This vulnerability involves a buffer overflow in the FMTSWriteUseIntelLib function, which could lead to unauthorized data access or modification. Such flaws may violate compliance requirements under GDPR (data integrity and security) and HIPAA (protected health information integrity). However, the advisory states the issue has low impact on confidentiality and integrity, suggesting minimal compliance risk.

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Mitigation Strategies

Apply vendor patches or updates for the affected SMM IHISI command handler. Disable or restrict access to the FMTS command 0x32 if not required. Monitor system logs for unusual buffer overflow attempts or memory access patterns.

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