CVE-2003-0346 in DirectX
Summary
by MITRE
Multiple integer overflows in a Microsoft Windows DirectX MIDI library (QUARTZ.DLL) allow remote attackers to execute arbitrary code via a MIDI (.mid) file with (1) large length for a Text or Copyright string, or (2) a large number of tracks, which leads to a heap-based buffer overflow.
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Analysis
by VulDB Data Team • 08/18/2025
The vulnerability described in CVE-2003-0346 represents a critical security flaw within Microsoft Windows DirectX multimedia subsystem, specifically within the QUARTZ.DLL component that handles MIDI file processing. This issue stems from improper input validation mechanisms within the MIDI library, creating exploitable conditions that can be leveraged by remote attackers to execute arbitrary code on affected systems. The vulnerability manifests when processing specially crafted MIDI files that contain malformed data structures, particularly text strings and track count specifications that exceed normal operational parameters.
The technical implementation of this vulnerability involves integer overflow conditions that occur when the QUARTZ.DLL library processes MIDI file headers and metadata. When a malicious MIDI file contains excessively large length values for text or copyright strings, or an unusually high number of tracks, the library's internal arithmetic operations fail to properly validate these values against their intended data type limits. This leads to situations where the calculated buffer sizes become negative or excessively large, causing heap memory allocation to occur at incorrect offsets. The resulting heap-based buffer overflow creates opportunities for attackers to overwrite adjacent memory locations with malicious code payloads, effectively bypassing normal memory protection mechanisms.
From an operational impact perspective, this vulnerability poses significant risks to Windows systems running affected DirectX versions, particularly those that process untrusted MIDI content automatically. The attack vector is remote and does not require user interaction, making it particularly dangerous for web-based applications, email attachments, or file sharing scenarios where MIDI files might be encountered. Systems that utilize DirectX for multimedia applications, including gaming platforms, multimedia production tools, and embedded systems with Windows-based interfaces, face elevated risk exposure. The vulnerability's exploitation potential aligns with ATT&CK technique T1059.007 for command and control execution through multimedia libraries, and CWE-190 specifically addresses integer overflow conditions that can lead to buffer overflows and arbitrary code execution.
The exploitation of this vulnerability typically requires crafting a malicious MIDI file with carefully calculated oversized fields that trigger the integer overflow conditions during parsing. Attackers can leverage this flaw in various contexts including web-based attacks, email attachments, or file sharing scenarios where users might inadvertently open malicious MIDI files. The vulnerability's classification under CWE-190 and its alignment with ATT&CK framework techniques demonstrates the fundamental nature of integer overflow vulnerabilities in software security. Organizations should implement immediate mitigations including disabling automatic MIDI file processing, applying Microsoft security patches, and implementing network-based restrictions on MIDI file content. Additionally, regular security assessments of multimedia processing components and monitoring for unusual memory allocation patterns can help detect potential exploitation attempts. The vulnerability underscores the importance of robust input validation and proper integer handling in multimedia libraries, particularly those that process untrusted external data formats.