CVE-2023-43574 in Desktop BIOS
Summary
by MITRE • 11/09/2023
A buffer over-read was reported in the LEMALLDriversConnectedEventHook module in some Lenovo Desktop products that may allow a local attacker with elevated privileges
to disclose sensitive information.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 11/09/2023
The vulnerability identified as CVE-2023-43574 represents a critical buffer over-read condition within the LEMALLDriversConnectedEventHook module of certain Lenovo desktop computer systems. This flaw exists within the firmware or driver components that manage device connection events and driver interactions within the system architecture. The vulnerability specifically affects Lenovo desktop products where the LEMALLDriversConnectedEventHook module is implemented, creating a potential exposure point for information disclosure attacks. The buffer over-read occurs when the module processes incoming data related to driver connections without proper bounds checking, allowing memory beyond the allocated buffer to be accessed and potentially read by an attacker.
The technical implementation of this vulnerability stems from inadequate input validation within the LEMALLDriversConnectedEventHook module which handles events related to driver connections and device management. When legitimate or malicious data is processed by this module, the code fails to verify that the data length does not exceed the allocated buffer space. This oversight creates a condition where adjacent memory locations can be accessed and read, potentially exposing sensitive system information including kernel memory contents, driver state information, or other confidential data structures. The vulnerability is particularly concerning because it requires only local access with elevated privileges, meaning an attacker who has already compromised a system or gained administrative rights can exploit this flaw to extract additional sensitive information from system memory.
The operational impact of CVE-2023-43574 extends beyond simple information disclosure, as the leaked memory contents could potentially contain cryptographic keys, authentication tokens, system credentials, or other sensitive data that could be leveraged for further attacks. Attackers could use the disclosed information to understand system internals, identify potential attack vectors, or extract secrets that might be used to escalate privileges or maintain persistence. The vulnerability also represents a potential pathway for attackers to gather intelligence about the system configuration and running processes, which could inform more sophisticated attacks. Given that this affects Lenovo desktop products, the impact could be widespread across enterprise environments where these systems are deployed, potentially exposing sensitive organizational data if exploited by threat actors.
Mitigation strategies for this vulnerability should focus on immediate firmware updates provided by Lenovo to address the buffer over-read condition in the LEMALLDriversConnectedEventHook module. Organizations should prioritize patching affected systems and ensure that all desktop products running vulnerable firmware versions are updated promptly. Additionally, system administrators should implement monitoring for unusual driver connection events that might indicate exploitation attempts. The vulnerability aligns with CWE-125, which specifically addresses out-of-bounds read conditions, and could potentially be leveraged as part of broader attack chains that align with ATT&CK techniques such as credential access and defense evasion. Network segmentation and privilege minimization should also be enforced to limit potential damage from any successful exploitation attempts, while regular security assessments should be conducted to identify similar vulnerabilities in other system components.