CVE-2023-43573 in Desktop BIOS
Summary
by MITRE • 11/09/2023
A buffer overflow was reported in the LEMALLDriversConnectedEventHook module in some Lenovo Desktop products that may allow a local attacker with elevated privileges to execute arbitrary code.
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Analysis
by VulDB Data Team • 11/09/2023
The vulnerability identified as CVE-2023-43573 represents a critical buffer overflow flaw within the LEMALLDriversConnectedEventHook module of specific Lenovo desktop computing systems. This issue resides in the kernel-level driver component responsible for managing device connection events and driver installations. The vulnerability stems from inadequate bounds checking mechanisms within the module's handling of device connection notifications, creating a scenario where malicious input data can exceed the allocated buffer space. The affected Lenovo desktop products typically include various models from their consumer and business lines that utilize this specific driver infrastructure for managing peripheral device connectivity and driver updates. The buffer overflow condition occurs when the system processes device connection events that contain oversized or malformed data structures, leading to memory corruption that can be exploited by an attacker with local elevated privileges. This vulnerability is particularly concerning because it operates at the kernel level, where the attacker already possesses elevated system privileges, eliminating the need for privilege escalation through traditional attack vectors.
The technical exploitation of this buffer overflow vulnerability follows a well-established pattern that aligns with common attack methodologies described in the attack technique framework. The flaw manifests when the LEMALLDriversConnectedEventHook module receives device connection events that contain oversized data payloads, causing the buffer to overflow into adjacent memory regions. This memory corruption can overwrite critical function pointers, return addresses, or other control data structures within the module's execution context. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, where the buffer is located on the stack and the overflow corrupts the program's execution flow. Attackers can leverage this condition to overwrite the return address of the affected function, redirecting execution flow to malicious code injected into the system. The attack requires local access with elevated privileges, typically corresponding to administrative or system-level user accounts, which is often achieved through prior compromise or legitimate administrative access. The exploitation process involves crafting specific device connection events that trigger the buffer overflow condition, potentially through malicious USB device connections or driver installation processes that bypass normal validation mechanisms.
The operational impact of CVE-2023-43573 extends beyond simple code execution capabilities, presenting significant risks to system integrity and data confidentiality within affected Lenovo desktop environments. Once successfully exploited, the buffer overflow allows attackers to execute arbitrary code with kernel-level privileges, potentially enabling complete system compromise and persistent access. The vulnerability affects multiple Lenovo desktop product lines, creating widespread exposure across various hardware configurations and system generations. Organizations utilizing these systems face potential data breaches, system instability, and unauthorized access to sensitive information stored on the affected devices. The attack vector typically involves physical access to the system or a legitimate administrative account, making the vulnerability particularly dangerous in environments where administrative access is more widely distributed. The impact is further compounded by the fact that the affected module handles device connection events, meaning that attacks could potentially be initiated through various peripheral devices or system update processes. System administrators must consider the potential for lateral movement within network environments, as the compromised system could serve as a foothold for broader attacks. The vulnerability also impacts system reliability, as memory corruption can cause unexpected system crashes or instability during normal operation.
Mitigation strategies for CVE-2023-43573 should prioritize immediate patch deployment from Lenovo, as the vendor has released firmware updates addressing the buffer overflow condition. Organizations should implement comprehensive access control measures, ensuring that only authorized personnel possess elevated privileges and that administrative accounts are protected through strong authentication mechanisms. System administrators should conduct thorough vulnerability assessments to identify all affected Lenovo desktop products within their environment and prioritize patching efforts accordingly. Network segmentation and monitoring solutions should be implemented to detect anomalous device connection patterns that might indicate exploitation attempts. The security posture should include regular review of system logs for unusual device connection events or driver installation activities that could signal attempted exploitation. Additionally, organizations should consider implementing application whitelisting policies to restrict execution of unauthorized code, particularly in environments where the vulnerability could be exploited through device connection events. Regular security awareness training should emphasize the importance of physical security controls and proper administrative access management. The mitigation approach should also include monitoring for indicators of compromise related to kernel-level code execution and implementing endpoint protection solutions capable of detecting malicious code injection techniques. Organizations should maintain detailed inventory records of all affected systems to facilitate rapid response and remediation efforts, ensuring that all instances of the vulnerable LEMALLDriversConnectedEventHook module are properly updated to prevent exploitation.