CVE-2010-3137 in WinAmp
Summary
by MITRE
Untrusted search path vulnerability in Nullsoft Winamp 5.581, and probably other versions, allows local users, and possibly remote attackers, to execute arbitrary code and conduct DLL hijacking attacks via a Trojan horse wnaspi32.dll that is located in the same folder as a .669, .aac, .aiff, .amf, .au, .avr, .b4s, .caf or .cda file.
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Analysis
by VulDB Data Team • 09/24/2021
The vulnerability identified as CVE-2010-3137 represents a critical untrusted search path issue affecting Nullsoft Winamp version 5.581 and potentially other iterations within the software ecosystem. This flaw resides in the application's dynamic link library loading mechanism, where the software fails to properly validate the source of dynamically loaded libraries during media file processing. The vulnerability manifests when Winamp encounters specific audio file formats including .669, .aac, .aiff, .amf, .au, .avr, .b4s, .caf, and .cda extensions, creating a dangerous condition where malicious actors can place a specially crafted Trojan horse wnaspi32.dll file in the same directory as these media files. This particular DLL name is significant as it corresponds to a legitimate Windows system component, making the malicious file more likely to be executed without suspicion. The underlying technical flaw aligns with CWE-427 Uncontrolled Search Path Element, which describes how applications that search for libraries using untrusted paths can be exploited by attackers who place malicious files in directories that are searched before legitimate system directories. This vulnerability operates at the intersection of multiple ATT&CK techniques including T1059 Command and Scripting Interpreter and T1574 Hijacking Execution Flow, where adversaries manipulate the system's library loading process to execute unauthorized code. The operational impact of this vulnerability extends beyond simple local privilege escalation as it can be exploited by remote attackers through various delivery mechanisms such as malicious email attachments, compromised websites, or peer-to-peer file sharing networks, making it particularly dangerous in enterprise environments where users may unknowingly open infected media files. The vulnerability's potential for remote exploitation depends on the attack vector used to deliver the malicious DLL alongside legitimate media files, which can occur through social engineering campaigns or automated malware distribution systems. Organizations running affected versions of Winamp face significant risk of arbitrary code execution, system compromise, and potential data exfiltration, as the malicious DLL can execute with the privileges of the Winamp process. The attack surface is particularly concerning because Winamp is a widely used media player with extensive file format support, meaning that the potential for exploitation is high across various user bases. Security professionals should note that this vulnerability demonstrates the critical importance of proper library loading practices and the dangers of trusting file paths without validation. The mitigation strategies for this vulnerability primarily involve updating to patched versions of Winamp, implementing strict file access controls, and deploying application whitelisting solutions that prevent execution of unauthorized DLL files. Additionally, system administrators should consider implementing network segmentation and monitoring for suspicious DLL loading activities to detect potential exploitation attempts. The vulnerability also highlights the importance of secure coding practices and the need for applications to implement proper DLL search path security measures, including the use of absolute paths for library loading and avoiding the inclusion of user-controllable directories in library search paths. This issue underscores the broader challenge of maintaining software security in legacy applications where proper security controls may not have been implemented during initial development phases, emphasizing the necessity of regular security assessments and patch management programs to address such persistent vulnerabilities.