CVE-2022-3742 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 execute arbitrary code due to improper buffer validation.
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Analysis
by VulDB Data Team • 08/24/2023
The vulnerability identified as CVE-2022-3742 resides within the LCFC BIOS implementation of certain Lenovo consumer notebook models, representing a critical security weakness that could be exploited by local attackers possessing elevated privileges. This flaw manifests as inadequate buffer validation mechanisms within the firmware layer, creating a pathway for malicious code execution that bypasses normal security boundaries. The issue specifically affects consumer-grade laptops where the BIOS firmware handles critical system operations and hardware initialization processes, making it a prime target for sophisticated attack vectors.
The technical root cause of this vulnerability stems from improper buffer handling within the LCFC BIOS codebase, which fails to adequately validate input data lengths and memory boundaries during firmware operations. This weakness creates potential buffer overflow conditions that can be manipulated by an attacker with local access and elevated privileges to overwrite critical memory regions. The vulnerability operates at the firmware level, making it particularly dangerous as it can execute code before the operating system fully initializes, effectively bypassing traditional OS-level security controls and detection mechanisms. This type of flaw aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which addresses heap-based buffer overflow scenarios that can occur in firmware environments.
The operational impact of CVE-2022-3742 extends beyond typical software vulnerabilities due to its firmware-level nature and the privileged execution context required for exploitation. Attackers with local elevated access could leverage this vulnerability to execute arbitrary code with system-level privileges, potentially leading to complete system compromise and persistent backdoor installation. The attack surface is limited to local users with elevated privileges, but this constraint does not diminish the severity since such access often represents a significant security breach within enterprise environments. The vulnerability's exploitation could result in data exfiltration, system instability, and the establishment of persistent malicious presence that survives operating system reboots. This scenario aligns with ATT&CK technique T1068, which covers local privilege escalation, and T1014, which addresses rootkit creation through firmware manipulation.
Mitigation strategies for this vulnerability require immediate firmware updates from Lenovo, as the primary fix involves patching the LCFC BIOS code to implement proper buffer validation mechanisms. Organizations should prioritize updating affected systems to the latest BIOS versions provided by Lenovo, which typically include enhanced memory boundary checks and improved input validation routines. Additionally, system administrators should implement strict access controls to prevent unauthorized elevation of privileges, as the vulnerability requires local elevated access for exploitation. Network monitoring solutions should be configured to detect anomalous behavior patterns that might indicate exploitation attempts, particularly focusing on unusual code execution within firmware contexts. The remediation process should also include comprehensive system integrity verification to ensure that the patched firmware has been properly installed and that no malicious modifications persist within the system's firmware components.