CVE-2014-9838 in ImageMagick
Summary
by MITRE
magick/cache.c in ImageMagick 6.8.9-9 allows remote attackers to cause a denial of service (crash).
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Analysis
by VulDB Data Team • 12/06/2024
The vulnerability identified as CVE-2014-9838 resides within the magick/cache.c component of ImageMagick version 6.8.9-9, representing a critical denial of service flaw that can be exploited by remote attackers to crash the application. This issue specifically affects the image processing library's cache management functionality, which is fundamental to how ImageMagick handles image data during various operations. The vulnerability stems from inadequate input validation and memory management practices within the caching mechanism, creating an exploitable condition that can be triggered through malformed image data. Such a flaw represents a significant security concern given ImageMagick's widespread use in web applications, content management systems, and server-side image processing workflows where it serves as a critical backend component for handling various image formats.
The technical implementation of this vulnerability involves the improper handling of image cache entries during the processing of maliciously crafted image files. When ImageMagick attempts to cache image data, the flawed code path fails to properly validate the size or structure of incoming image metadata, leading to memory corruption or buffer overflows that ultimately result in application crashes. This type of vulnerability falls under CWE-121, which describes heap-based buffer overflow conditions, and specifically relates to improper input validation within memory management functions. The flaw is particularly dangerous because it can be triggered through a simple HTTP request containing a specially crafted image file, making it highly exploitable in web environments where ImageMagick is used for image upload processing or automatic thumbnail generation.
The operational impact of CVE-2014-9838 extends beyond simple service disruption to potentially enable more sophisticated attack vectors when combined with other vulnerabilities. Organizations utilizing ImageMagick for image processing in web applications face significant risk of denial of service attacks that can render their services unavailable to legitimate users. The vulnerability's remote exploitability means that attackers do not need physical access to systems or network proximity to cause harm, making it particularly dangerous in cloud environments and multi-tenant hosting scenarios. From an attacker perspective, this vulnerability aligns with ATT&CK technique T1499.004, which involves network denial of service attacks, and can be leveraged as part of broader exploitation campaigns targeting web application infrastructure. The crash conditions can be reliably reproduced, making this a valuable primitive for attackers seeking to establish persistent access or to disrupt services in a systematic manner.
Mitigation strategies for CVE-2014-9838 should focus on immediate patching of affected ImageMagick installations, as the vulnerability was resolved in subsequent versions of the software. Organizations should implement network-level restrictions to limit access to image processing endpoints and deploy input validation mechanisms that can detect and reject malformed image data before it reaches the ImageMagick processing pipeline. Additional protective measures include implementing proper resource limits and timeouts for image processing operations, deploying intrusion detection systems to monitor for exploitation attempts, and establishing robust monitoring for service availability. The vulnerability highlights the importance of maintaining up-to-date security patches for open source components and demonstrates how seemingly minor flaws in core libraries can have significant operational impacts. Security teams should also consider implementing sandboxing mechanisms around image processing functions and regularly audit their image handling workflows to identify potential attack vectors that could leverage similar memory corruption issues.