CVE-2017-8352 in ImageMagick
Summary
by MITRE
In ImageMagick 7.0.5-5, the ReadXWDImage function in xwd.c allows attackers to cause a denial of service (memory leak) via a crafted file.
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Analysis
by VulDB Data Team • 12/02/2022
The vulnerability identified as CVE-2017-8352 represents a critical memory management flaw within ImageMagick's X Window Dump (XWD) image format processing functionality. This issue specifically affects ImageMagick version 7.0.5-5 and stems from improper memory allocation handling within the ReadXWDImage function located in the xwd.c source file. The flaw manifests when the software processes maliciously crafted XWD files, leading to a memory leak condition that can be exploited by remote attackers to consume system resources progressively.
The technical implementation of this vulnerability involves the ReadXWDImage function failing to properly release allocated memory blocks during the parsing of malformed XWD image files. When an attacker submits a specially constructed file, the function enters a processing loop where it allocates memory for image data structures without adequate cleanup mechanisms. This results in memory fragments that remain allocated even after the processing completes, creating a gradual consumption of available system memory. The vulnerability is classified as a memory leak under CWE-401, which specifically addresses the improper management of allocated memory resources.
From an operational perspective, this vulnerability creates significant denial of service risks for systems running ImageMagick applications that process user-uploaded or externally sourced XWD files. The memory leak can be exploited through various attack vectors including web applications that accept image uploads, email servers processing image attachments, or content management systems handling user-generated media. The impact extends beyond simple service disruption as the gradual memory consumption can lead to system instability, application crashes, or complete system hangs, particularly affecting servers with limited memory resources or those handling high volumes of image processing requests.
The attack surface for CVE-2017-8352 aligns with the ATT&CK framework's privilege escalation and denial of service tactics, as attackers can leverage this vulnerability to exhaust system resources without requiring elevated privileges. The vulnerability demonstrates characteristics consistent with the TTPs described in ATT&CK's resource exhaustion techniques where attackers manipulate application memory management to achieve persistent system degradation. Organizations using ImageMagick in web-facing applications or file processing workflows are particularly vulnerable, as the exploitation requires minimal technical skill and can be automated through simple file upload mechanisms.
Mitigation strategies for this vulnerability involve immediate patching of ImageMagick installations to versions that address the memory leak in the ReadXWDImage function. System administrators should implement strict file validation protocols that verify image file integrity before processing, particularly for user-uploaded content. Network-level controls including file type filtering and content inspection can help prevent malicious XWD files from reaching vulnerable applications. Additionally, implementing memory monitoring and alerting systems can help detect the early signs of memory exhaustion attacks. The vulnerability's classification under CWE-401 emphasizes the need for robust memory management practices in image processing libraries, and organizations should consider implementing application sandboxing or containerization to limit the impact of potential exploitation. Regular security audits of image processing pipelines and comprehensive vulnerability assessments should be conducted to identify similar memory management issues in other image libraries and processing components.