CVE-2004-1896 in WinAmp
Summary
by MITRE
Heap-based buffer overflow in in_mod.dll in Nullsoft Winamp 2.91 through 5.02 allows remote attackers to execute arbitrary code via a Fasttracker 2 (.xm) mod media file.
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Analysis
by VulDB Data Team • 06/28/2019
The vulnerability identified as CVE-2004-1896 represents a critical heap-based buffer overflow affecting Nullsoft Winamp media player versions 2.91 through 5.02. This flaw exists within the in_mod.dll module responsible for handling Fasttracker 2 (.xm) mod audio files, making it a significant security concern for users who process potentially malicious media content. The vulnerability stems from inadequate input validation and memory management practices when parsing mod file structures, creating an exploitable condition that can be triggered through remote delivery of malicious media files.
The technical implementation of this vulnerability involves the improper handling of memory allocation during the parsing of .xm file headers and associated data structures. When Winamp encounters a specially crafted mod file, the in_mod.dll component attempts to allocate heap memory for audio data processing without sufficient bounds checking. This allows attackers to overflow allocated buffers and overwrite adjacent memory regions, potentially corrupting program execution flow. The heap-based nature of the vulnerability means that the overflow occurs in dynamically allocated memory segments, making exploitation more complex but also more dangerous as it can lead to arbitrary code execution with the privileges of the affected application.
Operationally, this vulnerability presents a substantial risk to users who may unknowingly download or receive mod files from untrusted sources. The remote execution capability means that attackers can deliver malicious payloads through various vectors including email attachments, web downloads, or peer-to-peer file sharing networks. Once exploited, the vulnerability allows attackers to execute arbitrary code on the target system, potentially leading to complete system compromise, data theft, or establishment of persistent backdoors. The widespread use of Winamp during the early 2000s amplified the potential impact of this vulnerability across numerous user base.
The vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and demonstrates characteristics consistent with ATT&CK technique T1059.007 for command and scripting interpreter. Mitigation strategies should include immediate patching of affected Winamp versions to 5.03 or later, implementing strict file type validation, and deploying network-based intrusion detection systems to monitor for suspicious mod file patterns. Users should also employ application whitelisting policies and maintain updated antivirus signatures that can detect known malicious mod file variants. Additionally, system administrators should consider implementing sandboxing techniques for media file processing and regularly audit system configurations to prevent exploitation of similar memory corruption vulnerabilities.
This vulnerability serves as a historical example of how multimedia applications can become attack vectors through improper memory management practices, highlighting the importance of robust input validation and secure coding practices in media processing libraries. The exploitation of such vulnerabilities demonstrates the critical need for comprehensive security testing of third-party media components and regular security updates to protect against known exploits that may remain relevant for years after initial disclosure.