CVE-2012-5470 in VLC Media Player
Summary
by MITRE
libpng_plugin in VideoLAN VLC media player 2.0.3 allows remote attackers to cause a denial of service (application crash) via a crafted PNG file.
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Analysis
by VulDB Data Team • 12/29/2024
The vulnerability identified as CVE-2012-5470 represents a critical denial of service weakness within the VideoLAN VLC media player version 2.0.3, specifically affecting the libpng_plugin component responsible for handling portable network graphics file formats. This flaw enables remote attackers to deliberately crash the application by presenting a specially crafted malicious PNG file to the vulnerable media player. The issue stems from insufficient input validation and error handling mechanisms within the PNG decoding library integration, creating an exploitable condition where malformed image data can trigger unexpected application behavior leading to complete system termination.
The technical implementation of this vulnerability resides in the improper handling of malformed PNG file structures within the libpng_plugin module. When VLC processes a specially constructed PNG file, the underlying libpng library fails to properly validate the image headers, color formats, or compression parameters, resulting in memory corruption or stack overflow conditions that cause the media player to abruptly terminate. This represents a classic buffer overflow scenario where the application attempts to read or write beyond allocated memory boundaries, typically manifesting as segmentation faults or access violations that crash the entire process. The vulnerability operates at the application layer and requires no special privileges or authentication to exploit, making it particularly dangerous in remote attack scenarios.
The operational impact of CVE-2012-5470 extends beyond simple service disruption, as it can be leveraged as part of broader attack campaigns targeting media playback systems. Attackers can craft malicious PNG files and distribute them through various channels including email attachments, web downloads, or malicious websites, potentially affecting users who unknowingly open these files within VLC. The vulnerability affects a wide range of systems where VLC is installed, including desktop computers, mobile devices, and embedded systems running the affected software version. Organizations relying on VLC for media playback in enterprise environments face significant risk of service interruption and potential business disruption, particularly in scenarios where media processing is critical to operations. The exploitability of this vulnerability aligns with attack patterns documented in the mitre attack framework under the technique of privilege escalation through application exploitation, specifically targeting the execution and denial of service categories.
Mitigation strategies for CVE-2012-5470 primarily focus on immediate software updates and patches provided by the VideoLAN project, which address the underlying buffer handling issues within the libpng_plugin. System administrators should prioritize updating VLC installations to version 2.0.4 or later, where the vulnerability has been resolved through improved input validation and error handling mechanisms. Additionally, network administrators can implement content filtering measures to block PNG file transfers from untrusted sources, while users should exercise caution when opening media files from unknown origins. The vulnerability demonstrates characteristics consistent with CWE-121, which describes stack-based buffer overflow conditions, and aligns with attack patterns found in the attack technique catalog related to application-level exploitation. Organizations should also consider implementing application whitelisting policies that restrict execution of unauthorized media processing applications and maintain regular security assessments to identify similar vulnerabilities in other multimedia components.