CVE-2018-9069 in IdeaPad
Summary
by MITRE
In some Lenovo IdeaPad consumer notebook models, a race condition in the BIOS flash device locking mechanism is not adequately protected against, potentially allowing an attacker with administrator access to alter the contents of BIOS.
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Analysis
by VulDB Data Team • 03/29/2020
The vulnerability identified as CVE-2018-9069 represents a critical weakness in the firmware security architecture of certain Lenovo IdeaPad consumer notebook models. This flaw resides within the BIOS flash device locking mechanism, which is designed to prevent unauthorized modifications to the system's firmware during normal operation. The race condition occurs when multiple processes attempt to access or modify the BIOS flash memory simultaneously, creating a temporal window where the protective mechanisms fail to maintain proper access controls. This vulnerability specifically affects consumer-grade devices rather than enterprise or business models, indicating a targeted security gap in Lenovo's firmware implementation for retail products.
The technical nature of this vulnerability stems from improper synchronization mechanisms within the BIOS firmware code that governs access to the flash memory storage used for firmware persistence. When legitimate system processes and potentially malicious actors attempt to modify the BIOS contents concurrently, the locking mechanism fails to properly enforce exclusive access, creating a window where unauthorized modifications can occur. This race condition manifests as a failure in the firmware's integrity protection scheme, which is typically implemented to prevent unauthorized firmware updates or modifications that could compromise system security. The vulnerability is particularly concerning because it requires only administrator-level access on the system, meaning that an attacker who has already gained user privileges could exploit this weakness to escalate their access to firmware-level modifications.
From an operational perspective, this vulnerability poses significant risks to system integrity and security posture. An attacker who successfully exploits this race condition could potentially install malicious firmware modifications that persist across system reboots, making the compromise extremely difficult to detect and remediate. The implications extend beyond simple privilege escalation, as firmware-level modifications can bypass traditional operating system security controls and antivirus solutions. This vulnerability aligns with CWE-362, which describes a race condition in software design, and represents a critical weakness in the firmware security model that violates fundamental security principles. The attack surface is particularly relevant in environments where consumer notebooks may be deployed in corporate or educational settings, where the device might be used by individuals with legitimate administrative access but who could potentially be compromised or malicious.
The mitigation strategies for this vulnerability involve both immediate remediation steps and longer-term architectural improvements. Users should ensure their devices are running the latest BIOS firmware versions provided by Lenovo, as the company typically releases patches to address such firmware-level security issues. System administrators should implement strict access controls and monitor for unusual administrative activities on affected devices. Organizations should consider implementing firmware integrity monitoring solutions that can detect unauthorized modifications to BIOS contents. The vulnerability demonstrates the importance of robust firmware security practices and aligns with ATT&CK technique T1014, which covers rootkit detection and bypass methods, highlighting how firmware-level attacks can circumvent traditional security controls. Given the nature of the flaw, the most effective long-term solution involves redesigning the BIOS locking mechanism to properly handle concurrent access scenarios and eliminate the race condition entirely through better synchronization primitives and access control enforcement.