CVE-2015-8957 in ImageMagick
Summary
by MITRE
Buffer overflow in ImageMagick before 6.9.0-4 Beta allows remote attackers to cause a denial of service (application crash) via a crafted SUN file.
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Analysis
by VulDB Data Team • 12/01/2022
The vulnerability identified as CVE-2015-8957 represents a critical buffer overflow flaw within ImageMagick's processing capabilities, specifically affecting versions prior to 6.9.0-4 Beta. This issue resides in the software's handling of SUN raster image files, which are commonly used for storing bitmap images in Sun Microsystems environments. The flaw manifests when ImageMagick attempts to parse maliciously crafted SUN files, creating a condition where insufficient bounds checking allows attackers to write beyond allocated memory buffers. This vulnerability falls under the CWE-121 buffer overflow category, specifically classified as a stack-based buffer overflow, as described in the Common Weakness Enumeration catalog. The security implications extend beyond simple denial of service, as buffer overflows can potentially enable more sophisticated attacks including arbitrary code execution, making this a particularly dangerous flaw in image processing software that is widely deployed across web applications and content management systems.
The technical exploitation of this vulnerability requires an attacker to craft a specially formatted SUN file that triggers the buffer overflow condition during image parsing. When ImageMagick processes such a malformed file, the application's memory management becomes compromised as the overflow corrupts adjacent memory regions, leading to unpredictable application behavior and eventual crash. The operational impact is significant for systems that process untrusted image uploads, as attackers can reliably cause service disruption through carefully constructed malicious files. This vulnerability is particularly concerning in web applications where users can upload images, as it allows for remote code execution through the manipulation of the image processing pipeline. The attack vector is straightforward and does not require specialized knowledge beyond basic file crafting techniques, making it accessible to a wide range of threat actors. According to ATT&CK framework, this vulnerability maps to the T1203 technique for exploitation of remote services, specifically targeting the image processing capabilities of applications.
Organizations utilizing ImageMagick for image processing must implement immediate mitigations to address this vulnerability, including upgrading to version 6.9.0-4 Beta or later, which contains the necessary patches to prevent the buffer overflow condition. Additional protective measures should include implementing strict file validation and sanitization processes, particularly for image uploads, and deploying web application firewalls that can detect and block suspicious image file patterns. The vulnerability demonstrates the critical importance of input validation in multimedia processing libraries, as these components often handle untrusted data from multiple sources. Security teams should also consider implementing sandboxing mechanisms for image processing operations and regularly monitoring for unauthorized file uploads that could exploit similar vulnerabilities. The incident underscores the necessity of maintaining current software versions and implementing comprehensive security testing procedures for all image processing components within enterprise applications. Organizations that have not yet updated their ImageMagick installations should prioritize this remediation due to the potential for both service disruption and more severe security compromise through exploitation of this buffer overflow vulnerability.