CVE-2012-0260 in ImageMagick
Summary
by MITRE
The JPEGWarningHandler function in coders/jpeg.c in ImageMagick before 6.7.6-3 allows remote attackers to cause a denial of service (memory consumption) via a JPEG image with a crafted sequence of restart markers.
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Analysis
by VulDB Data Team • 12/03/2021
The vulnerability identified as CVE-2012-0260 represents a critical denial of service flaw within ImageMagick's JPEG handling component. This issue affects versions prior to 6.7.6-3 and specifically targets the JPEGWarningHandler function located in the coders/jpeg.c source file. The vulnerability arises from insufficient input validation when processing JPEG images containing specially crafted sequences of restart markers, which can trigger excessive memory consumption during image processing operations.
The technical exploitation of this vulnerability occurs through the manipulation of JPEG image format specifications, particularly focusing on the restart marker mechanism that JPEG employs for error recovery. Restart markers are periodic markers inserted within JPEG streams to allow decoders to resynchronize in case of data corruption. When ImageMagick encounters a JPEG image with an abnormal sequence of these restart markers, the JPEGWarningHandler function fails to properly handle the malformed data, leading to uncontrolled memory allocation patterns. This behavior constitutes a classic example of a resource exhaustion attack where malicious input causes the application to consume increasing amounts of memory until system resources are depleted.
From an operational perspective, this vulnerability poses significant risks to systems that process user-uploaded or externally sourced JPEG images, particularly web applications, content management systems, and file processing services. Attackers can craft malicious JPEG files that, when processed by vulnerable ImageMagick installations, will cause memory consumption to spiral out of control, effectively rendering the target system unavailable to legitimate users. The impact extends beyond simple service disruption as the memory consumption can lead to system crashes, process termination, or even complete system instability depending on the hosting environment and available resources.
The vulnerability aligns with CWE-400, which catalogs weaknesses related to resource exhaustion, and demonstrates characteristics consistent with the attack pattern described in the MITRE ATT&CK framework under the T1499.004 subtechnique for Network Denial of Service. The flaw essentially creates a condition where legitimate processing operations become impossible due to resource constraints, making it particularly dangerous in environments where ImageMagick is used for automated image processing workflows. Organizations utilizing ImageMagick for image handling should consider this vulnerability as part of their broader security posture assessment, particularly in environments where untrusted image content is processed.
Mitigation strategies for CVE-2012-0260 primarily involve upgrading to ImageMagick version 6.7.6-3 or later, which includes patches addressing the improper handling of restart markers. Additionally, implementing input validation measures such as image size limits, format verification, and resource monitoring can help detect and prevent exploitation attempts. System administrators should also consider implementing sandboxing mechanisms and resource quotas for image processing services to minimize the impact of potential exploitation attempts. The vulnerability highlights the importance of proper input validation in multimedia processing libraries and serves as a reminder of the critical security considerations when handling potentially malicious file formats in web applications and automated processing systems.