CVE-2009-4867 in Tuniac
Summary
by MITRE
Buffer overflow in Tuniac 090517c allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a long URL in a .m3u playlist file.
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Analysis
by VulDB Data Team • 12/08/2024
The vulnerability identified as CVE-2009-4867 affects Tuniac media player version 090517c and represents a critical buffer overflow flaw that can be exploited through maliciously crafted playlist files. This vulnerability resides in the handling of media playlist data, specifically within the parsing of .m3u playlist files that contain extended URL references. The buffer overflow occurs when the application processes a maliciously constructed URL that exceeds the allocated buffer space, leading to memory corruption that can result in application instability or arbitrary code execution. The flaw is particularly concerning because it can be triggered through remote means, allowing attackers to deliver malicious playlist files via network shares, web downloads, or email attachments without requiring local system access. The vulnerability directly maps to CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The technical implementation of this vulnerability involves the application's failure to properly validate the length of URL strings contained within .m3u playlist files before copying them into fixed-size buffers. When a maliciously long URL is encountered during playlist parsing, the application's string handling routines overflow the allocated memory space, potentially overwriting critical program variables, return addresses, or other memory structures. This memory corruption can cause the application to crash immediately or, in more sophisticated exploitation scenarios, allow an attacker to inject and execute malicious code with the privileges of the affected application. The exploitation vector is particularly dangerous because .m3u playlist files are commonly used across various media players and can be easily distributed through legitimate channels, making the attack surface broad and accessible. The vulnerability demonstrates characteristics consistent with the attack pattern described in the MITRE ATT&CK framework under technique T1203, which involves the exploitation of memory corruption vulnerabilities to gain code execution privileges.
The operational impact of this vulnerability extends beyond simple denial of service scenarios to encompass potential system compromise and unauthorized code execution. When exploited successfully, the buffer overflow can lead to complete application compromise, allowing attackers to execute arbitrary commands on the victim's system with the same privileges as the Tuniac application. This could result in unauthorized access to media files, potential data exfiltration, or the installation of additional malware. The vulnerability affects systems where Tuniac is installed and actively processes playlist files, making it particularly dangerous in enterprise environments where media players are commonly used for audio and video content management. Organizations that rely on playlist-based media delivery systems are at risk, as attackers can craft malicious playlists that will trigger the vulnerability when opened by unsuspecting users. The risk is amplified by the fact that many users may not be aware of the potential security implications of opening playlist files from untrusted sources, creating a social engineering component that makes the attack more effective.
Mitigation strategies for CVE-2009-4867 should focus on both immediate protective measures and long-term system hardening. The most effective immediate solution involves upgrading to a patched version of Tuniac that properly validates URL lengths and implements robust bounds checking mechanisms. System administrators should also implement strict file access controls and content filtering measures that prevent automatic execution of playlist files from untrusted sources. Network-level protections including firewall rules and intrusion detection systems can help identify and block malicious playlist file transfers. Additionally, user education programs should emphasize the importance of only opening playlist files from trusted sources and avoiding automatic playback of unknown media content. The vulnerability highlights the importance of input validation and memory safety practices as outlined in secure coding guidelines such as those provided by the CERT Secure Coding Standards. Organizations should also consider implementing application whitelisting policies that restrict which media applications can be executed on systems, reducing the attack surface for such vulnerabilities. Regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions in other media processing applications that may be susceptible to similar exploitation techniques.