CVE-2022-34325 in insyde
Summary
by MITRE • 11/15/2022
DMA transactions which are targeted at input buffers used for the StorageSecurityCommandDxe software SMI handler could cause SMRAM corruption through a TOCTOU attack. DMA transactions which are targeted at input buffers used for the software SMI handler used by the StorageSecurityCommandDxe driver could cause SMRAM corruption. This issue was discovered by Insyde engineering based on the general description provided by
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Analysis
by VulDB Data Team • 06/13/2026
The vulnerability identified as CVE-2022-34325 represents a critical security flaw within the StorageSecurityCommandDxe driver component of UEFI firmware systems. This issue stems from improper handling of DMA transactions targeting input buffers used by the software SMI (System Management Interrupt) handler, creating a pathway for sophisticated attacks that can compromise the most sensitive memory regions of a system. The vulnerability specifically affects systems where the StorageSecurityCommandDxe driver processes storage security commands through SMI handlers, making it particularly concerning for enterprise and server environments where data integrity and system security are paramount. The flaw exists in the fundamental architecture of how DMA operations interact with SMI handler input buffers, creating a persistent threat vector that can be exploited by attackers with physical access to the target system.
The technical root cause of this vulnerability manifests through a time-of-check to time-of-use (TOCTOU) attack pattern that exploits the window between when a DMA transaction is validated and when it is actually processed. When DMA transactions target input buffers used by the StorageSecurityCommandDxe SMI handler, the system fails to properly validate or lock these buffers during the processing cycle, allowing attackers to manipulate the buffer contents between the initial validation and final execution phases. This creates an opportunity for adversaries to inject malicious data or modify existing data within the input buffers, ultimately leading to corruption of SMRAM (System Management RAM) which contains the most privileged system code and sensitive data. The vulnerability specifically leverages the fact that SMI handlers operate with the highest privilege level and have direct access to system memory, making any corruption of SMRAM potentially catastrophic for system security.
The operational impact of CVE-2022-34325 extends beyond traditional software vulnerabilities as it represents a fundamental flaw in firmware security architecture that can be exploited to gain complete system compromise. Attackers who can execute DMA transactions against affected systems can potentially escalate privileges to the highest system level, gaining access to cryptographic keys, user credentials, and other sensitive information stored in SMRAM. This vulnerability directly impacts the principle of least privilege and can be exploited to bypass hardware security features, making it particularly dangerous in environments where physical security controls may be insufficient. The attack requires the adversary to have physical access to the target system and the ability to execute DMA operations, which can be achieved through various means including malicious USB devices, Thunderbolt peripherals, or other DMA-capable hardware. The consequences include complete system compromise, data exfiltration, and potential persistence mechanisms that can survive operating system reboots.
Mitigation strategies for this vulnerability must address both the immediate firmware-level issues and broader system security controls. Organizations should prioritize firmware updates from vendors that contain patches specifically addressing the DMA buffer handling in StorageSecurityCommandDxe, as this represents a vendor-specific fix that directly targets the root cause. Additionally, implementing DMA protection mechanisms such as Intel VT-d or AMD-Vi can help prevent unauthorized DMA transactions, while disabling unused DMA capabilities and peripheral interfaces reduces the attack surface. The security community should also consider implementing memory protection techniques such as SMRAM locking and memory encryption to provide additional layers of defense. From an ATT&CK perspective, this vulnerability maps to techniques involving privilege escalation and persistence through firmware manipulation, while the CWE classification would fall under CWE-367 Time-of-Check to Time-of-Use (TOCTOU) Error, making it a critical concern for enterprise security teams implementing comprehensive threat hunting and incident response procedures.