CVE-2004-1119 in WinAmp
Summary
by MITRE
Stack-based buffer overflow in IN_CDDA.dll in Winamp 5.05, and possibly other versions including 5.06, allows remote attackers to execute arbitrary code via a certain .m3u playlist file.
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Analysis
by VulDB Data Team • 07/06/2025
The vulnerability identified as CVE-2004-1119 represents a critical stack-based buffer overflow flaw located within the IN_CDDA.dll component of Winamp media player version 5.05 and potentially affecting version 5.06. This issue arises from improper input validation when processing specially crafted .m3u playlist files, which are commonly used for organizing and playing multimedia content. The vulnerability stems from the insecure handling of user-supplied data during the parsing of playlist entries, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system control.
The technical implementation of this buffer overflow occurs when the IN_CDDA.dll module processes playlist entries without adequate bounds checking on the length of input data. When a malicious .m3u file contains excessively long strings or malformed data within its entries, the buffer allocated on the stack becomes overwritten beyond its intended capacity. This overflow allows attackers to manipulate the program execution flow by overwriting return addresses, stack canaries, or other critical program variables. The vulnerability specifically targets the stack memory layout, making it particularly dangerous as it can be exploited to inject and execute arbitrary machine code within the context of the Winamp process. The flaw is classified under CWE-121 Stack-based Buffer Overflow, which is a well-documented weakness in software security that has been consistently identified as a high-risk vulnerability in numerous security assessments.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it enables remote code execution capabilities that can lead to complete system compromise. Attackers can craft malicious .m3u playlist files that, when opened by an unsuspecting user, will trigger the buffer overflow condition and provide them with arbitrary code execution privileges on the target system. This vulnerability is particularly concerning because .m3u files are commonly shared through various channels including email attachments, instant messaging platforms, and web downloads, making it easy for attackers to distribute malicious payloads. The remote exploitation capability means that attackers do not need physical access to the target system, as they can deliver the malicious playlist file through network-based attacks or social engineering techniques. According to ATT&CK framework, this vulnerability maps to T1190 Exploit Public-Facing Application, where the attacker leverages a known vulnerability in a widely used application to gain initial access. The attack chain typically involves delivering the malicious playlist file, which when opened by Winamp triggers the buffer overflow, leading to privilege escalation and potential system takeover.
Mitigation strategies for CVE-2004-1119 should prioritize immediate remediation through official vendor patches and updates, as the vulnerability affects widely deployed software components. Users should disable automatic playlist execution and implement strict file validation controls when handling multimedia content from untrusted sources. Network administrators should consider implementing application whitelisting policies that restrict execution of Winamp or similar media players until proper security updates are deployed. The vulnerability also highlights the importance of input validation and bounds checking in software development practices, particularly for applications that process user-supplied data from external sources. Security teams should monitor for exploitation attempts through network intrusion detection systems and implement proper logging of playlist file processing activities. Organizations should also consider implementing sandboxing techniques or virtualization for media playback applications to limit the potential impact of successful exploitation attempts. The incident underscores the critical need for regular security assessments and vulnerability management processes, as this vulnerability was present in widely used software for an extended period before proper patches were released. This case study serves as a reminder of how seemingly minor input validation flaws can lead to significant security breaches and emphasizes the importance of secure coding practices throughout the software development lifecycle.