CVE-2014-9814 in ImageMagick
Summary
by MITRE
ImageMagick allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted wpg file.
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Analysis
by VulDB Data Team • 10/31/2024
The vulnerability identified as CVE-2014-9814 represents a critical denial of service weakness within ImageMagick, a widely deployed image processing library that forms the backbone of numerous web applications, content management systems, and digital asset management platforms. This flaw specifically manifests when the software processes specially crafted wpg (WordPerfect Graphics) files, which are legacy image formats that were once commonly used in office environments but have since fallen out of favor. The vulnerability stems from inadequate input validation and error handling mechanisms within ImageMagick's image parsing routines, creating an exploitable condition that can be leveraged by remote attackers to disrupt service availability.
The technical nature of this vulnerability constitutes a NULL pointer dereference, a condition classified under CWE-476 as a null pointer dereference, which occurs when software attempts to access memory through a pointer that has not been properly initialized or has been set to null. In the context of ImageMagick, when processing the malformed wpg file, the library fails to properly validate the structure of the image data, leading to a scenario where a pointer variable intended to reference image metadata or processing buffers becomes null. When the application subsequently attempts to dereference this null pointer during the image processing workflow, the system crashes with a segmentation fault, effectively terminating the service and rendering it unavailable to legitimate users. This type of vulnerability falls under the ATT&CK technique T1499.004 for Network Denial of Service, as it exploits the application's failure to handle malformed input gracefully.
The operational impact of CVE-2014-9814 extends far beyond a simple service interruption, as it affects the reliability and availability of systems that depend on ImageMagick for image processing capabilities. When exploited, this vulnerability can cause cascading failures in web applications, content management systems, and digital asset management platforms that utilize ImageMagick for image handling. The vulnerability is particularly dangerous in multi-tiered architectures where a single compromised service can affect entire application stacks, as the denial of service can be triggered by uploading a malicious wpg file through any interface that accepts image uploads, including web forms, API endpoints, or file upload mechanisms. Organizations running vulnerable versions of ImageMagick are exposed to potential disruption of critical business operations, especially in environments where automated image processing workflows are common, as the vulnerability can be exploited through automated means without requiring privileged access or complex attack vectors.
Mitigation strategies for this vulnerability require immediate attention and should include several layers of defensive measures. The most critical remediation involves updating ImageMagick to version 6.8.8-1 or later, which contains the necessary patches to properly handle malformed wpg files and prevent the NULL pointer dereference condition. Additionally, implementing input validation controls at the application level can provide defense-in-depth, including restricting file type uploads, implementing strict content type checks, and employing sandboxing techniques to isolate image processing operations. Network-level mitigations such as implementing rate limiting and upload restrictions can help reduce the attack surface, while monitoring and logging mechanisms should be deployed to detect potential exploitation attempts. The vulnerability also highlights the importance of regular security assessments and vulnerability management programs, as it demonstrates how legacy file format support can introduce unexpected security risks into modern applications. Organizations should also consider implementing principle of least privilege controls for image processing services and establishing incident response procedures specifically tailored to handle denial of service vulnerabilities in image processing libraries.