CVE-2008-0984 in VLC Media Player
Summary
by MITRE
The MP4 demuxer (mp4.c) for VLC media player 0.8.6d and earlier, as used in Miro Player 1.1 and earlier, allows remote attackers to overwrite arbitrary memory and execute arbitrary code via a malformed MP4 file.
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Analysis
by VulDB Data Team • 04/19/2025
The vulnerability identified as CVE-2008-0984 represents a critical buffer overflow condition within the MP4 demuxer component of VLC media player version 0.8.6d and earlier versions. This flaw exists in the mp4.c file which handles the parsing and demultiplexing of MPEG-4 formatted media files. The vulnerability specifically affects not only VLC itself but also Miro Player 1.1 and earlier versions which utilize the same underlying VLC components. The flaw stems from inadequate input validation and memory management within the MP4 file parsing logic, creating a scenario where maliciously crafted media files can trigger unauthorized memory access patterns.
The technical implementation of this vulnerability involves a classic buffer overflow exploit where attacker-controlled data in a malformed MP4 file causes the demuxer to write beyond allocated memory boundaries. When VLC processes an specially crafted MP4 file, the parser fails to properly validate the size parameters of various MP4 atoms or boxes that constitute the file structure. This validation failure allows an attacker to manipulate the parsing logic such that data written to memory locations beyond the intended buffer boundaries. The overflow can be leveraged to overwrite critical memory structures including return addresses, function pointers, or other control data that govern program execution flow.
The operational impact of this vulnerability extends far beyond simple media playback disruption. Remote attackers can leverage this flaw to execute arbitrary code with the privileges of the user running the affected media player application. This creates a significant threat vector for attackers who can distribute malicious MP4 files through various channels including email attachments, web downloads, or peer-to-peer networks. The vulnerability is particularly dangerous because it operates at the media parsing layer, meaning that simply opening a malicious file in VLC or Miro Player can result in complete system compromise without user interaction beyond the initial file opening. This characteristic aligns with attack patterns described in the MITRE ATT&CK framework under the T1203 technique for exploitation of remote services and T1059 for command and scripting interpreter usage.
The root cause of this vulnerability can be categorized under CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. These classifications reflect the fundamental memory corruption patterns that occur when the MP4 demuxer fails to properly validate input data sizes against allocated memory buffers. The vulnerability also demonstrates characteristics of CWE-787, out-of-bounds write conditions, where the parser writes data beyond the boundaries of intended memory regions. The exploitation of this vulnerability requires minimal user interaction and can be automated through web-based delivery mechanisms, making it particularly attractive to threat actors seeking widespread compromise. Organizations using affected versions of VLC or Miro Player should immediately implement mitigation strategies including version updates, network-based filtering of MP4 files, and user education regarding the risks of opening untrusted media files from unknown sources.
The broader implications of this vulnerability highlight the critical importance of input validation and memory safety in multimedia processing libraries. Media player applications serve as common attack vectors due to their frequent use and the complex nature of media file formats that require extensive parsing logic. The vulnerability demonstrates how seemingly benign file format processing can become a gateway for sophisticated attacks when proper memory management and input validation are not implemented. Security practitioners should consider this vulnerability as representative of the broader class of issues affecting multimedia frameworks and emphasize the need for regular security updates and vulnerability assessments in media processing applications.