CVE-2022-3430 in Notebook
Summary
by MITRE • 01/23/2023
A potential vulnerability in the WMI Setup driver on some consumer Lenovo Notebook devices may allow an attacker with elevated privileges to modify secure boot setting by modifying an NVRAM variable.
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Analysis
by VulDB Data Team • 02/18/2023
The vulnerability identified as CVE-2022-3430 resides within the WMI Setup driver component of certain Lenovo consumer notebook devices, representing a significant security concern that undermines the integrity of the system's boot process. This flaw specifically targets the secure boot mechanism, which serves as a fundamental security control designed to prevent unauthorized code execution during the system startup sequence. The vulnerability manifests when an attacker possesses elevated privileges, typically through legitimate administrative access or prior compromise of the system, enabling them to manipulate critical NVRAM variables that control secure boot configurations. The WMI Setup driver, which provides management interfaces for system configuration and monitoring, becomes a vector for privilege escalation and configuration modification that bypasses normal security boundaries. This represents a direct threat to the integrity of the boot process and can potentially allow attackers to disable or modify secure boot settings, thereby undermining the entire chain of trust that secure boot mechanisms are designed to establish.
The technical implementation of this vulnerability stems from improper access controls and validation within the WMI Setup driver's handling of NVRAM variables that govern secure boot configurations. When an attacker with elevated privileges invokes the driver's management interfaces, they can manipulate specific NVRAM variables that control the secure boot policy without proper authentication or authorization checks. The vulnerability essentially allows for modification of the platform configuration registers that store the secure boot state, enabling attackers to disable secure boot or modify the boot policy to allow unsigned code execution. This flaw aligns with CWE-284, which addresses improper access control, and represents a specific case of privilege escalation through improper privilege management. The vulnerability does not require physical access or specialized hardware tools, as it operates through legitimate management interfaces that are typically available to system administrators or users with elevated privileges.
The operational impact of CVE-2022-3430 extends beyond simple privilege escalation, creating potential pathways for sophisticated attacks that can compromise the entire system security posture. Once an attacker modifies secure boot settings, they can effectively bypass critical security controls that prevent unauthorized code execution, potentially enabling rootkit installation, firmware manipulation, or persistent backdoor establishment. This vulnerability can be particularly dangerous in enterprise environments where administrators may have elevated privileges but are not necessarily malicious actors, as it creates opportunities for insider threats or compromised administrative accounts to undermine system security. The implications align with ATT&CK technique T1068, which covers local privilege escalation, and T1542, which addresses multiple techniques for persistence and privilege escalation. The vulnerability also affects the integrity of the system's boot process, potentially allowing attackers to establish persistent footholds that survive system reboots and can evade traditional security monitoring solutions.
Mitigation strategies for CVE-2022-3430 should focus on both immediate remediation and long-term security hardening measures. Organizations should prioritize applying vendor-provided firmware updates and patches that address the specific WMI Setup driver vulnerability. System administrators should implement strict access control policies, limiting the number of users with elevated privileges and ensuring proper authentication for all management interfaces. Network segmentation and monitoring of WMI-related activities can help detect unauthorized access attempts to the vulnerable driver interfaces. Additionally, implementing proper audit logging for secure boot configuration changes and NVRAM modifications can provide early detection of potential exploitation attempts. The vulnerability highlights the importance of supply chain security and the need for comprehensive firmware security assessments, particularly for devices from manufacturers that may not implement robust security controls in their management interfaces. Organizations should also consider implementing hardware-based security measures such as TPM-based secure boot enforcement and ensuring that any modifications to secure boot settings are properly audited and authorized through formal change management processes.