CVE-2014-9821 in ImageMagick
Summary
by MITRE
Heap-based buffer overflow in ImageMagick allows remote attackers to have unspecified impact via a crafted xpm file.
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Analysis
by VulDB Data Team • 10/31/2024
The heap-based buffer overflow vulnerability in ImageMagick identified as CVE-2014-9821 represents a critical security flaw that enables remote attackers to execute arbitrary code or cause system instability through maliciously crafted xpm image files. This vulnerability exists within the image processing library's handling of extended pixmap format files, which are commonly used for storing graphical data in various applications and systems. The flaw stems from inadequate input validation and memory management practices during the parsing of xpm file structures, creating opportunities for attackers to manipulate heap memory layout and potentially execute malicious code with the privileges of the affected application.
The technical implementation of this vulnerability occurs when ImageMagick processes an xpm file containing malformed data that exceeds the allocated buffer boundaries in heap memory. This particular flaw falls under the CWE-121 heap-based buffer overflow category, where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability manifests when the application attempts to read or write data beyond the intended buffer limits, potentially corrupting heap metadata or overwriting critical program structures. The heap memory corruption can lead to arbitrary code execution, denial of service, or information disclosure depending on the specific memory locations overwritten and the execution environment.
The operational impact of CVE-2014-9821 extends across numerous systems and applications that rely on ImageMagick for image processing capabilities. This includes web applications, content management systems, file upload handlers, and various server-side image processing services that accept user-uploaded images. Attackers can exploit this vulnerability by crafting malicious xpm files that trigger the buffer overflow during image parsing, potentially leading to complete system compromise when the vulnerable application processes these files. The remote exploitation capability makes this vulnerability particularly dangerous as attackers can leverage it without requiring local access to the target system, enabling widespread impact across internet-facing services.
Mitigation strategies for this vulnerability involve immediate patching of ImageMagick installations to the latest versions that contain proper bounds checking and memory management fixes. Organizations should also implement strict file type validation and sanitization measures, particularly for image file uploads, to prevent processing of potentially malicious files. Network-based defenses can include implementing file extension filtering, content inspection systems, and restricting image processing capabilities for untrusted user uploads. Additionally, application-level protections such as sandboxing image processing operations, using restricted execution environments, and implementing proper input validation can significantly reduce the attack surface. From an ATT&CK framework perspective, this vulnerability maps to techniques involving code injection and privilege escalation, making it a critical target for defensive measures including regular security assessments and vulnerability management programs.