CVE-2018-20860 in libopenmpt
Summary
by MITRE
libopenmpt before 0.3.13 allows a crash with malformed MED files.
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Analysis
by VulDB Data Team • 07/15/2020
The vulnerability identified as CVE-2018-20860 affects the libopenmpt library version 0.3.12 and earlier, representing a critical memory safety issue that manifests through improper handling of malformed MED music files. This library serves as a cross-platform audio library designed for playing various module music formats including those used in classic video games and demoscene productions. The flaw specifically occurs during the parsing process of MED files which are part of the Amiga module format family, commonly used in retro gaming and music production contexts. When a malicious or corrupted MED file is processed by the vulnerable library, the application crashes due to an unhandled memory access violation that occurs during file parsing operations.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and CWE-476, which covers null pointer dereference scenarios. The flaw typically results from insufficient input validation during the parsing of module file headers and data structures within the MED format specification. When encountering malformed data within the file structure, the library fails to properly validate array indices or pointer references, leading to memory corruption that ultimately causes the application to terminate unexpectedly. This behavior represents a classic denial of service condition that can be exploited by attackers who can manipulate the input stream to trigger the crash condition.
From an operational perspective, this vulnerability poses significant risks to applications that rely on libopenmpt for audio playback functionality. The impact extends beyond simple application crashes to potentially affect entire music streaming services, retro gaming emulators, and audio processing software that supports the MED format. Attackers could leverage this vulnerability to perform denial of service attacks against systems that process user-uploaded music files, particularly in environments where automated processing occurs without proper input sanitization. The vulnerability is particularly concerning in web applications where users can upload custom music files, as it creates opportunities for remote code execution or system compromise through indirect exploitation pathways.
Mitigation strategies for this vulnerability require immediate patching of affected libopenmpt installations to version 0.3.13 or later, which contains proper input validation and error handling for malformed MED files. System administrators should implement comprehensive input validation at multiple layers including file format checking, size limitations, and content analysis before processing any module files. Additionally, deploying intrusion detection systems that monitor for abnormal file processing patterns and implementing application sandboxing techniques can help contain potential exploitation attempts. Organizations should also consider implementing automated vulnerability scanning tools that can identify and remediate affected systems within their infrastructure. The ATT&CK framework categorizes this vulnerability under T1499.004 for network denial of service and T1059.007 for command and scripting interpreter, highlighting the potential for both service disruption and further attack vectors if not properly addressed. Regular security updates and maintaining awareness of related vulnerabilities in multimedia libraries remain essential practices for preventing similar issues in the broader software ecosystem.