CVE-2017-3754 in Notebook
Summary
by MITRE
Some Lenovo brand notebook systems do not have write protections properly configured in the system BIOS. This could enable an attacker with physical or administrative access to a system to be able to flash the BIOS with an arbitrary image and potentially run malicious BIOS code.
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Analysis
by VulDB Data Team • 10/26/2019
The vulnerability identified as CVE-2017-3754 represents a critical flaw in the firmware security architecture of certain Lenovo notebook systems, specifically affecting the Basic Input/Output System configuration. This weakness stems from improper implementation of write protection mechanisms within the system's firmware, creating a fundamental breach in the hardware security model that governs BIOS integrity. The vulnerability manifests when the system fails to enforce proper access controls during the firmware update process, allowing unauthorized modification of critical system components that typically require stringent security measures to prevent tampering.
The technical flaw resides in the BIOS firmware's insufficient implementation of write protection mechanisms, which should normally prevent modification of system firmware components without proper authorization. This weakness creates a persistent attack vector that can be exploited by adversaries with physical access to the device or those who have already gained administrative privileges within the operating system. The vulnerability directly relates to CWE-1001, which addresses weaknesses that are not properly addressed in the development process, and specifically maps to CWE-264, which deals with permissions, privileges, and access controls within firmware environments. The flaw enables attackers to perform malicious BIOS flashing operations, potentially installing rootkits or other persistent malware that operates at the firmware level, making detection and remediation extremely challenging.
The operational impact of this vulnerability extends far beyond typical software-based attacks, as it allows for persistent system compromise that can survive complete operating system reinstallation or disk formatting operations. Attackers with physical access can leverage this weakness to install malicious firmware that operates below the operating system level, potentially enabling keystroke logging, network traffic interception, or complete system takeover. This represents a significant threat to enterprise security environments where physical security controls may be insufficient, and the vulnerability can be exploited to establish long-term persistence within targeted systems. The attack surface is particularly concerning given that BIOS-level attacks are often undetectable by traditional endpoint protection solutions and can bypass standard security controls, making this vulnerability a prime target for advanced persistent threats and nation-state actors.
Mitigation strategies for CVE-2017-3754 should focus on both immediate remediation and long-term architectural improvements to firmware security. Organizations should implement strict physical security measures for all affected systems, including secure storage areas, asset tracking, and access controls to prevent unauthorized physical access. Firmware update procedures must be enhanced with proper authentication mechanisms and digital signatures to prevent unauthorized flashing operations, aligning with industry best practices outlined in the NIST firmware security guidelines. System administrators should consider implementing BIOS write protection features where available, and organizations should regularly audit their firmware security configurations to ensure proper access controls are maintained. The vulnerability also highlights the importance of firmware integrity monitoring solutions and regular security assessments of system firmware components, as recommended in the MITRE ATT&CK framework for firmware-level adversary techniques. Additionally, vendors should ensure that all firmware updates include proper security measures and that system manufacturers implement robust verification processes to prevent similar weaknesses in future product designs.