CVE-2015-3320 in USB Enhanced Performance Keyboard
Summary
by MITRE
Lenovo USB Enhanced Performance Keyboard software before 2.0.2.2 includes active debugging code in SKHOOKS.DLL, which allows local users to obtain keypress information by accessing debug output.
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Analysis
by VulDB Data Team • 01/20/2019
The vulnerability identified as CVE-2015-3320 affects Lenovo USB Enhanced Performance Keyboard software versions prior to 2.0.2.2, representing a critical security flaw that exposes sensitive user input data through improperly configured debugging functionality. This issue resides within the SKHOOKS.DLL component of the keyboard driver software, where active debugging code remains enabled in production builds rather than being properly disabled or removed during the software compilation process. The presence of this debugging code creates an unintended attack surface that allows local attackers to access keypress information through direct access to debug output mechanisms, fundamentally compromising the confidentiality of user input data.
The technical implementation of this vulnerability stems from the inclusion of debugging functions within the software's dynamic link library without proper security considerations during the software development lifecycle. This flaw aligns with CWE-489, which addresses the presence of debugging code in production software, and represents a classic example of insecure configuration where development-time debugging features persist in deployed environments. The SKHOOKS.DLL module contains functionality that was intended for software development and testing purposes but has been inadvertently left active in the final product, creating an accessible pathway for unauthorized information disclosure. Attackers can exploit this by directly accessing the debug output channels, potentially capturing keystrokes, passwords, and other sensitive input data that users enter through the affected keyboard.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass potential compromise of user credentials, personal data, and system security. Local users with access to the system can leverage this vulnerability to capture keystrokes, which may include passwords, personal identification numbers, and other confidential information entered through the keyboard. This represents a significant threat to system confidentiality and could enable attackers to escalate privileges, gain unauthorized access to accounts, or conduct further malicious activities. The vulnerability affects all users running affected versions of the Lenovo keyboard software, making it particularly dangerous as it requires no network connectivity or external attack vectors, relying instead on local system access.
Mitigation strategies for CVE-2015-3320 focus primarily on updating to the patched version of the Lenovo USB Enhanced Performance Keyboard software, specifically version 2.0.2.2 or later, which properly removes or disables the debugging code. System administrators should implement comprehensive software update policies to ensure all affected devices receive the necessary patches promptly. Additionally, security monitoring should be enhanced to detect any unauthorized access attempts to debug output channels or unusual system behavior that might indicate exploitation attempts. Organizations should also consider implementing keyboard input monitoring solutions and conducting regular security assessments of third-party software components to identify similar issues. This vulnerability demonstrates the importance of proper software security testing and the need for development teams to follow secure coding practices, particularly regarding the removal of debugging code from production builds. The issue also highlights the relevance of ATT&CK technique T1056.001, which covers credential harvesting through keylogging, as this vulnerability enables exactly such capabilities through direct keyboard input interception.
The broader implications of this vulnerability extend to supply chain security considerations, as it demonstrates how third-party software components can introduce security risks that affect end-user systems. Organizations should maintain detailed inventories of all software components installed on their systems and regularly audit these components for known vulnerabilities. This case study serves as a reminder of the critical importance of proper software release management and the need for thorough security reviews before deploying software to production environments. The vulnerability also underscores the necessity of implementing defense-in-depth strategies that include multiple layers of security controls to protect against various attack vectors, including those that exploit poorly configured software components.