CVE-2020-15596 in TouchPad Driver
Summary
by MITRE
The ALPS ALPINE touchpad driver before 8.2206.1717.634, as used on various Dell, HP, and Lenovo laptops, allows attackers to conduct Path Disclosure attacks via a "fake" DLL file.
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Analysis
by VulDB Data Team • 08/13/2020
The vulnerability identified as CVE-2020-15596 represents a critical path disclosure weakness in the ALPS ALPINE touchpad driver software ecosystem. This flaw affects multiple major laptop manufacturers including Dell, HP, and Lenovo, where the vulnerable driver versions prior to 8.2206.1717.634 are susceptible to exploitation. The vulnerability stems from inadequate validation mechanisms within the driver's dynamic link library loading process, creating an avenue for malicious actors to manipulate system paths through deceptive file placement strategies. The attack vector specifically exploits the driver's failure to properly authenticate or verify the legitimacy of dynamically loaded libraries, allowing adversaries to place malicious DLL files in strategic locations that the driver will subsequently load and execute.
The technical implementation of this vulnerability aligns with CWE-22 Path Traversal and CWE-427 Uncontrolled Search Path Element, where the driver's search path configuration does not adequately restrict file loading from untrusted sources. Attackers can craft a "fake" DLL file and position it in a location that the touchpad driver will prioritize during its loading sequence, effectively bypassing normal security controls. This creates a privilege escalation scenario where malicious code can be executed with the elevated privileges typically associated with system drivers, potentially enabling full system compromise. The vulnerability operates at the operating system level where the driver executes with kernel-mode privileges, making the impact significantly more severe than typical user-mode exploits.
The operational impact of this vulnerability extends beyond simple path disclosure, as it provides attackers with a persistent foothold on affected systems. Once successfully exploited, adversaries can establish backdoors, escalate privileges, or deploy additional malware components through the compromised touchpad driver interface. The widespread deployment of this driver across multiple OEM platforms increases the potential attack surface considerably, as the vulnerability affects numerous laptop models from different manufacturers. This creates a substantial risk for enterprise environments where these devices are commonly used, potentially allowing attackers to gain access to sensitive corporate data through seemingly innocuous touchpad components. The attack requires minimal user interaction and can be executed remotely in some scenarios, making it particularly dangerous for mobile computing environments.
Mitigation strategies for CVE-2020-15596 should focus on immediate driver version updates from manufacturers, with Dell, HP, and Lenovo releasing patches to address the vulnerable touchpad driver versions. Organizations should implement strict endpoint protection measures including application whitelisting policies to prevent unauthorized DLL loading, and monitor for suspicious file placement activities in system directories. The remediation process requires careful coordination with device manufacturers to ensure proper driver updates are deployed across affected inventory, as the vulnerability affects multiple hardware platforms and driver versions. System administrators should also consider implementing security controls that restrict write permissions to critical system directories and establish monitoring protocols for unusual driver loading activities. Additionally, the vulnerability highlights the importance of supply chain security and proper driver code signing practices to prevent unauthorized modifications to system components. This issue demonstrates the critical need for robust software integrity verification mechanisms and proper privilege separation in system drivers, as outlined in various cybersecurity frameworks including the ATT&CK framework's techniques for privilege escalation and persistence.