CVE-2018-14436 in ImageMagick
Summary
by MITRE
ImageMagick 7.0.8-4 has a memory leak in ReadMIFFImage in coders/miff.c.
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Analysis
by VulDB Data Team • 04/25/2023
The vulnerability identified as CVE-2018-14436 represents a critical memory management flaw within ImageMagick version 7.0.8-4, specifically within the ReadMIFFImage function located in the coders/miff.c source file. This issue manifests as a memory leak that occurs during the processing of MIFF (Magick Image File Format) image files, which are commonly used for storing image data in the ImageMagick ecosystem. The flaw demonstrates a failure in proper memory deallocation mechanisms, where allocated memory blocks are not correctly released back to the system after image processing operations complete. This vulnerability is particularly concerning given ImageMagick's widespread adoption across various platforms and applications, making it a prime target for exploitation by malicious actors seeking to disrupt system operations or execute denial-of-service attacks.
The technical implementation of this memory leak stems from insufficient memory management practices within the ReadMIFFImage function, which is responsible for reading and interpreting MIFF formatted image files. When processing malformed or specially crafted MIFF files, the function fails to properly handle memory allocation and deallocation sequences, resulting in memory blocks that remain allocated indefinitely. This behavior can be categorized under CWE-401, which specifically addresses "Improper Release of Memory Before Removing Last Reference" and aligns with the broader category of memory management vulnerabilities. The flaw operates at the application level within the image processing pipeline, where legitimate image file processing routines encounter unexpected memory handling patterns that prevent proper cleanup operations from executing.
The operational impact of this vulnerability extends significantly across multiple attack vectors and system environments where ImageMagick is deployed. Systems utilizing ImageMagick for web applications, content management systems, or automated image processing workflows become vulnerable to memory exhaustion attacks that can lead to system instability, application crashes, or complete service outages. The memory leak accumulates over time as the application processes multiple image files, potentially leading to gradual system performance degradation or complete memory exhaustion that affects other running processes. This vulnerability particularly impacts server environments where ImageMagick is used for handling user-uploaded content, as attackers can craft malicious MIFF files that trigger the memory leak with each processing attempt. The attack surface is further expanded when considering that ImageMagick is integrated into numerous web servers, image processing pipelines, and automated workflows, making this vulnerability a significant concern for enterprise security.
Mitigation strategies for CVE-2018-14436 must address both immediate remediation and long-term security posture improvements. The primary and most effective mitigation involves upgrading to ImageMagick version 7.0.8-5 or later, which contains the patched implementation of the ReadMIFFImage function with proper memory management protocols. Organizations should also implement input validation measures that filter or reject malformed MIFF files before they reach the image processing components. Security practices should include monitoring for unusual memory consumption patterns and implementing resource limits on image processing operations to prevent complete system exhaustion. Additionally, deployment environments should consider implementing sandboxing or containerization techniques to isolate image processing components and limit the impact of potential memory leak exploitation. From an operational security perspective, regular vulnerability assessments and patch management procedures should be enforced to ensure all ImageMagick installations remain current with security fixes. The ATT&CK framework categorizes this vulnerability under the T1499 technique for "Network Denial of Service" and T1059 for "Command and Scripting Interpreter" as attackers may leverage this vulnerability to consume system resources and potentially escalate privileges through system instability.