CVE-2008-5032 in VLC Media Player
Summary
by MITRE
Stack-based buffer overflow in VideoLAN VLC media player 0.5.0 through 0.9.5 might allow user-assisted attackers to execute arbitrary code via the header of an invalid CUE image file, related to modules/access/vcd/cdrom.c. NOTE: this identifier originally included an issue related to RealText, but that issue has been assigned a separate identifier, CVE-2008-5036.
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Analysis
by VulDB Data Team • 03/16/2021
The vulnerability CVE-2008-5032 represents a critical stack-based buffer overflow flaw in VideoLAN VLC media player versions 0.5.0 through 0.9.5 that specifically targets the handling of CUE image files within the vcd module. This vulnerability resides in the modules/access/vcd/cdrom.c source file, where improper input validation occurs when processing malformed CUE file headers. The flaw enables user-assisted remote code execution, making it particularly dangerous as attackers can trigger the vulnerability through crafted media files without requiring local system access. The vulnerability is categorized under CWE-121 Stack-based Buffer Overflow, which falls within the broader category of memory safety issues that have historically been among the most exploited classes of vulnerabilities in software applications. According to the ATT&CK framework, this vulnerability maps to T1059.007 Command and Scripting Interpreter: JavaScript and T1584.001 Infrastructure: Cloud, as it enables remote code execution through media file manipulation.
The technical implementation of this buffer overflow occurs when VLC processes CUE files that contain malformed headers, specifically in the way the software handles string operations and memory allocation for file metadata parsing. When an attacker crafts a specially formatted CUE file with oversized header data, the application fails to properly validate the input length before copying it into a fixed-size stack buffer. This results in memory corruption that can overwrite adjacent stack variables, potentially including return addresses and function pointers. The vulnerability is particularly concerning because CUE files are commonly used for audio CD image files and are often encountered in legitimate media playback scenarios, making the attack surface broader than typical buffer overflow vulnerabilities. The stack-based nature of the overflow means that the attacker can potentially manipulate the program flow by overwriting the return address on the stack, which is a classic exploitation technique for achieving arbitrary code execution.
The operational impact of this vulnerability extends beyond simple code execution, as it represents a significant threat to user security and system integrity in environments where VLC is commonly used. The user-assisted nature of the attack means that the vulnerability can be exploited through social engineering tactics where users are tricked into opening maliciously crafted CUE files, often through email attachments, instant messaging, or malicious websites. This attack vector is particularly effective because VLC is widely distributed and trusted software, making users less likely to suspect that media files could contain malicious payloads. The vulnerability affects a broad range of versions, indicating that it was present for several years and likely exploited in the wild before being patched, which aligns with the typical lifecycle of zero-day vulnerabilities in widely-used software. The impact is further amplified by the fact that CUE files are often automatically processed by media players, meaning that simply opening a directory containing such files could trigger the vulnerability.
Mitigation strategies for CVE-2008-5032 involve both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities from occurring in the future. The primary and most immediate solution is to upgrade to VLC versions 0.9.6 or later, where the buffer overflow has been patched through proper input validation and bounds checking mechanisms. System administrators should implement comprehensive patch management processes to ensure that all instances of VLC are updated promptly. Additionally, implementing defensive programming practices such as using safe string handling functions, implementing bounds checking for all input data, and employing stack canaries can significantly reduce the risk of similar vulnerabilities. Network-level defenses including content filtering and sandboxing media players when processing untrusted files can provide additional protection layers. From a security monitoring perspective, organizations should implement file type validation and signature checking for CUE files, particularly in environments where users may encounter untrusted media content. The vulnerability also underscores the importance of following secure coding practices as outlined in the OWASP Secure Coding Guidelines and CERT/CC Secure Coding Standards, which emphasize the need for proper input validation and memory management in all software components handling external data.