CVE-2022-3745 in LCFC BIOS
Summary
by MITRE • 08/23/2023
A potential vulnerability was discovered in LCFC BIOS for some Lenovo consumer notebook models that could allow a local attacker with elevated privileges to view incoming and returned data from SMI.
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Analysis
by VulDB Data Team • 09/16/2023
The vulnerability identified as CVE-2022-3745 resides within the LCFC BIOS implementation used in specific Lenovo consumer notebook models, representing a significant security concern for system integrity and data confidentiality. This weakness manifests as a potential information disclosure flaw that could be exploited by local attackers who have already gained elevated privileges on the system. The vulnerability specifically affects the handling of System Management Interrupts within the BIOS firmware, creating a pathway for unauthorized data inspection that could compromise sensitive information flowing through the system's management interface.
The technical nature of this vulnerability stems from improper handling of SMI (System Management Interrupt) communication channels within the BIOS firmware layer. When SMI requests are processed, the system's firmware fails to adequately protect the data flow between the management agent and the system components, allowing for potential interception or observation of data that should remain protected. This flaw operates at the firmware level, making it particularly dangerous as it can bypass traditional operating system security controls and detection mechanisms. The vulnerability is classified under CWE-200 (Information Exposure) and represents a critical weakness in the system's security architecture, as it enables unauthorized data access through legitimate system management pathways.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could potentially enable more sophisticated attacks by providing attackers with insights into system management operations and data flows. An attacker with local elevated privileges could leverage this weakness to monitor sensitive communications, potentially identifying system configurations, security parameters, or other confidential information that could be used to facilitate further exploitation. The attack surface is limited to local access with elevated privileges, but the implications are severe as it undermines the fundamental security assumptions of the system's management interface. This vulnerability directly impacts the principle of least privilege and could enable privilege escalation or lateral movement within the system environment.
Mitigation strategies for CVE-2022-3745 should focus on both immediate remediation and long-term security hardening measures. The most effective approach involves applying the latest BIOS updates from Lenovo that specifically address this vulnerability, as the manufacturer has released patches to correct the SMI data handling implementation. Organizations should also implement strict access controls and privilege management to minimize the risk of local elevated access, while monitoring system logs for any suspicious activity related to SMI operations. Additionally, implementing firmware integrity monitoring solutions and conducting regular security assessments of embedded systems can help detect and prevent exploitation attempts. The vulnerability's classification under ATT&CK technique T1068 (Exploitation for Privilege Escalation) and T1566 (Phishing) highlights the need for comprehensive security awareness training and monitoring of system management interfaces to prevent unauthorized access to privileged execution environments.