CVE-2007-4392 in WinAmp
Summary
by MITRE
Winamp 5.35 allows remote attackers to cause a denial of service (program stack overflow and application crash) via an M3U file that recursively includes itself.
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Analysis
by VulDB Data Team • 06/07/2025
The vulnerability identified as CVE-2007-4392 represents a classic stack overflow condition affecting Winamp version 5.35 and potentially earlier versions. This issue manifests when the media player processes specially crafted M3U playlist files that contain recursive self-references, creating an infinite loop in the playlist parsing routine. The flaw resides in how Winamp handles playlist inclusion mechanisms, specifically failing to implement proper recursion detection during M3U file processing. When the application encounters an M3U file that references itself, either directly or through a chain of nested includes, the parser continues to recursively process the same file indefinitely. This uncontrolled recursion rapidly consumes stack memory resources until the application crashes or becomes unresponsive, effectively creating a denial of service condition.
The technical implementation of this vulnerability aligns with CWE-123, which describes weakness in the design of recursive algorithms that fail to properly terminate. The flaw operates at the application layer and requires no special privileges to exploit, making it particularly dangerous as it can be triggered through simple file manipulation. Attackers need only create or obtain an M3U file containing a self-referencing directive such as INCLUDE "self.m3u" or similar recursive constructs, then present this file to a victim running the vulnerable Winamp version. The stack overflow occurs during the playlist parsing phase when the application's recursive inclusion routine lacks bounds checking or depth limiting mechanisms. This vulnerability demonstrates poor input validation and inadequate error handling within the media player's playlist processing engine, which should have implemented safeguards against such recursive scenarios.
The operational impact of CVE-2007-4392 extends beyond simple service disruption as it represents a fundamental flaw in the application's memory management and parsing logic. When exploited, the vulnerability can cause complete application termination, requiring users to manually restart Winamp or reboot their systems. In enterprise environments, this could lead to widespread disruption of media playback services, particularly in scenarios where automated playlist management systems might be processing user-uploaded content. The vulnerability also presents potential for more sophisticated attacks if attackers can leverage the crash to execute arbitrary code, though the current exploitation primarily focuses on denial of service. The issue affects both local and remote attack vectors since M3U files can be distributed through various means including email attachments, web downloads, or network shares. This makes the vulnerability particularly concerning for environments where users might encounter untrusted media playlists.
Mitigation strategies for CVE-2007-4392 should include immediate patching of affected Winamp versions, with the release of version 5.36 addressing this specific vulnerability through enhanced playlist parsing logic. Organizations should implement strict file validation policies for playlist files, particularly in environments where user-generated content is processed. The solution requires implementing recursion depth limits within the playlist parser, setting maximum inclusion depths, and monitoring for suspicious file structures. System administrators should consider disabling automatic playlist inclusion features or implementing whitelist controls for playlist file processing. Additionally, network security controls such as content filtering and file type validation can help prevent the delivery of malicious M3U files to vulnerable systems. The vulnerability also highlights the importance of proper software testing for recursive scenarios, particularly in applications that process hierarchical data structures. From an ATT&CK framework perspective, this vulnerability maps to T1499.004 for network denial of service and T1059.007 for command and scripting interpreter usage in malicious file creation. Regular security updates and patch management procedures should be enforced to prevent exploitation of such legacy vulnerabilities, as they often remain unpatched in older systems and can serve as entry points for more sophisticated attacks.