CVE-2014-9809 in ImageMagick
Summary
by MITRE
ImageMagick allows remote attackers to cause a denial of service (segmentation fault and application crash) via a crafted xwd image.
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Analysis
by VulDB Data Team • 10/31/2024
The vulnerability identified as CVE-2014-9809 represents a critical denial of service weakness within ImageMagick, a widely deployed image processing library that handles over 80 image formats. This flaw specifically affects the handling of X Window System's XWD (X Window Dump) image format, which is commonly used for screen captures and window screenshots. The vulnerability stems from inadequate input validation and memory management within the image parsing routines, creating a scenario where maliciously crafted XWD files can trigger segmentation faults and subsequent application crashes.
The technical exploitation of this vulnerability occurs when ImageMagick processes a malformed XWD image file that contains malformed header data or corrupted pixel information. The flaw manifests as a buffer overflow or improper memory access pattern during the parsing of XWD format metadata, particularly in the way the library handles the image dimensions, color depth, or compression parameters. When the vulnerable library attempts to parse these crafted elements, it executes code that leads to memory corruption, ultimately causing the segmentation fault that terminates the application process. This behavior aligns with CWE-125, which describes out-of-bounds read vulnerabilities, and CWE-787, which covers out-of-bounds writes.
The operational impact of CVE-2014-9809 extends beyond simple service disruption, as it can be leveraged in various attack scenarios that compromise system availability. Web applications that utilize ImageMagick for image processing, particularly those accepting user uploads or processing external image sources, become vulnerable to this attack vector. The vulnerability can be exploited through web-based file upload interfaces, email attachment processing, or any system that automatically processes XWD formatted images without proper sanitization. Attackers can craft malicious XWD files that, when processed by vulnerable ImageMagick installations, will cause service interruptions that can be used for DoS attacks against web applications, content management systems, or file processing services.
Organizations utilizing ImageMagick in production environments should implement immediate mitigations to address this vulnerability. The most effective approach involves upgrading to ImageMagick version 6.8.9-0 or later, which includes patches that properly validate XWD image headers and implement robust memory management during image parsing. Additionally, administrators should consider implementing input validation at the application level, rejecting XWD files or sanitizing them before processing through ImageMagick. Network-level mitigations can include content filtering to block XWD file uploads or processing, though this approach may impact legitimate functionality. The vulnerability also maps to ATT&CK technique T1499.004, which covers network denial of service attacks, and demonstrates how image processing libraries can serve as attack vectors in broader cybersecurity incidents. Organizations should also consider implementing monitoring for abnormal application crashes or segmentation fault patterns that may indicate exploitation attempts, as these behaviors can serve as indicators of compromise in security operations centers.