CVE-2014-9818 in ImageMagick
Summary
by MITRE
ImageMagick allows remote attackers to cause a denial of service (out-of-bounds access) via a malformed sun file.
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Analysis
by VulDB Data Team • 10/31/2024
The vulnerability identified as CVE-2014-9818 represents a critical out-of-bounds memory access flaw within ImageMagick, a widely deployed image processing library used across numerous applications and systems. This vulnerability specifically affects the handling of SUN raster image files, which are commonly used in Unix and Linux environments for storing bitmap images. The flaw arises from insufficient input validation during the parsing of malformed SUN file structures, creating a scenario where remote attackers can craft malicious files that trigger memory access violations when processed by vulnerable ImageMagick implementations.
The technical implementation of this vulnerability stems from improper bounds checking within the SUN file format parser component of ImageMagick. When processing a malformed SUN file, the library fails to properly validate array indices or memory boundaries, allowing attackers to manipulate memory access patterns that extend beyond allocated buffer limits. This out-of-bounds access can result in program crashes, memory corruption, or potentially more severe consequences depending on the execution environment. The vulnerability is classified under CWE-129 as an insufficient input validation issue, specifically manifesting as an out-of-bounds read or write operation that can be exploited remotely without requiring authentication or special privileges.
The operational impact of CVE-2014-9818 extends significantly across multiple attack vectors due to ImageMagick's widespread adoption in web applications, content management systems, and server-side image processing workflows. Attackers can leverage this vulnerability by uploading malicious SUN files to systems that utilize ImageMagick for image handling, leading to denial of service conditions that can disrupt legitimate service operations. The remote nature of the attack means that systems processing user-uploaded images are particularly vulnerable, as attackers can exploit the flaw through web interfaces without requiring physical access to the target systems. This vulnerability directly maps to ATT&CK technique T1203 in the adversary tactics and techniques framework, representing a denial of service attack through manipulation of input validation mechanisms.
Mitigation strategies for CVE-2014-9818 should prioritize immediate patching of affected ImageMagick installations to version 6.8.9-1 or later, which includes the necessary input validation fixes. Organizations should implement comprehensive input validation measures at multiple layers, including file type detection, size restrictions, and format validation before any processing occurs. Network-based defenses can include implementing file extension filtering and content inspection rules to block potentially malicious SUN files. Additionally, system administrators should consider implementing sandboxing mechanisms for image processing operations and regularly monitor for suspicious file uploads or processing patterns that might indicate exploitation attempts. The vulnerability highlights the critical importance of maintaining up-to-date security patches and implementing defense-in-depth strategies for image processing systems that handle untrusted input from external sources.