CVE-2022-3728 in ThinkPad T13 Gen3
Summary
by MITRE • 10/25/2023
A vulnerability was reported in ThinkPad T14s Gen 3 and X13 Gen3 that could cause the BIOS tamper detection mechanism to not trigger under specific circumstances which could allow unauthorized access.
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Analysis
by VulDB Data Team • 10/28/2023
This vulnerability resides within the firmware security mechanisms of Lenovo ThinkPad T14s Gen 3 and X13 Gen 3 laptops, representing a critical flaw in the system's hardware-based security architecture. The issue affects the BIOS tamper detection system that is designed to monitor and respond to unauthorized modifications or physical attacks on the system's firmware components. The vulnerability manifests when specific conditions are met that prevent the tamper detection mechanism from properly identifying and triggering security responses to potential threats.
The technical flaw stems from insufficient validation logic within the BIOS firmware that governs how tamper detection is performed during system operation. When certain combinations of hardware states, firmware versions, or environmental conditions occur simultaneously, the security monitoring system fails to recognize that unauthorized access attempts are taking place. This creates a window of opportunity for attackers to perform malicious modifications without triggering the expected security alerts and protective measures that should be activated.
From an operational impact perspective, this vulnerability represents a significant risk to enterprise and government security environments where these laptops are commonly deployed. The inability of the tamper detection system to properly respond to unauthorized access attempts undermines the fundamental security assumptions of the device's hardware security model. Attackers could potentially exploit this weakness to install malicious firmware components, extract sensitive data, or establish persistent backdoors within the system. The vulnerability particularly affects organizations that rely on hardware-level security assurances for protecting classified information or critical infrastructure components.
The flaw aligns with CWE-372 which addresses "Weaknesses in Security Design" and specifically relates to inadequate protection mechanisms in embedded systems. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1014 (Rootkit) and T1542.001 (Run-time Application Protection) where adversaries can bypass system security controls. Organizations should implement immediate mitigations including firmware updates from Lenovo, enhanced monitoring of system integrity, and deployment of additional software-based security controls to compensate for the weakened hardware security. Regular security assessments and hardware integrity verification procedures should be strengthened to detect potential exploitation attempts. The vulnerability also underscores the importance of comprehensive security testing for embedded systems and highlights the need for robust validation of security mechanisms under various operational conditions.
This issue demonstrates the critical importance of proper firmware security design and the potential consequences when tamper detection mechanisms fail to function correctly under specific conditions. Organizations should consider implementing layered security approaches that do not rely solely on hardware-based protections and maintain awareness of potential firmware-level vulnerabilities that could compromise system security.