CVE-2017-9409 in ImageMagick
Summary
by MITRE
In ImageMagick 7.0.5-5, the ReadMPCImage function in mpc.c allows attackers to cause a denial of service (memory leak) via a crafted file.
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Analysis
by VulDB Data Team • 12/07/2022
The vulnerability identified as CVE-2017-9409 represents a critical memory management flaw within ImageMagick's processing pipeline that specifically targets the ReadMPCImage function in the mpc.c source file. This issue affects ImageMagick version 7.0.5-5 and demonstrates how improper memory handling in image processing libraries can lead to denial of service conditions that compromise system stability and availability. The flaw occurs when the software encounters specially crafted image files that trigger memory allocation patterns which are not properly cleaned up during the image processing workflow.
The technical implementation of this vulnerability stems from inadequate memory deallocation practices within the ReadMPCImage function that processes MPC (Magick Persistent Cache) image files. When an attacker provides a malformed MPC file, the function allocates memory resources to process the image data but fails to properly release these allocations upon encountering parsing errors or unexpected file structures. This memory leak occurs repeatedly with each malicious file submission, gradually consuming available system memory until the process becomes unresponsive or crashes entirely. The vulnerability operates at the application layer and can be exploited through any interface that processes image files, including web applications, batch processing systems, and command-line utilities that utilize ImageMagick's image handling capabilities.
From an operational impact perspective, this vulnerability poses significant risks to systems that rely on ImageMagick for image processing tasks, particularly web applications that accept user-uploaded images or automated systems that process large volumes of media files. The denial of service condition can be triggered remotely through file uploads or by processing maliciously crafted files in batch operations, making it particularly dangerous in environments where automated image processing workflows exist. Organizations using ImageMagick in production systems may experience service degradation, application crashes, or complete system unavailability, especially when the vulnerability is exploited in high-volume processing scenarios where multiple memory leaks compound over time.
The vulnerability aligns with CWE-401, which specifically addresses improper release of memory, and can be mapped to ATT&CK technique T1499.004 for network denial of service attacks. Security practitioners should implement immediate mitigations including updating to patched versions of ImageMagick where available, implementing input validation and file type checking before image processing, and deploying sandboxed environments for image handling operations. Additional defensive measures include monitoring for unusual memory consumption patterns, implementing resource limits on image processing services, and establishing proper file format validation to prevent exploitation of malformed image files. Organizations should also consider restricting image processing capabilities to trusted sources and implementing automated scanning for potentially malicious image files to reduce the attack surface exposed to this vulnerability.