CVE-2017-10928 in ImageMagick
Summary
by MITRE
In ImageMagick 7.0.6-0, a heap-based buffer over-read in the GetNextToken function in token.c allows remote attackers to obtain sensitive information from process memory or possibly have unspecified other impact via a crafted SVG document that is mishandled in the GetUserSpaceCoordinateValue function in coders/svg.c.
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Analysis
by VulDB Data Team • 12/09/2022
The vulnerability CVE-2017-10928 represents a critical heap-based buffer over-read flaw in ImageMagick version 7.0.6-0 that exposes sensitive information from process memory through crafted SVG documents. This vulnerability resides within the GetNextToken function in token.c, which serves as a fundamental parsing component for handling various file formats including SVG. The flaw occurs when the GetUserSpaceCoordinateValue function in coders/svg.c processes malformed SVG content, leading to improper memory access patterns that can result in information disclosure or potentially more severe consequences.
The technical implementation of this vulnerability demonstrates a classic buffer over-read condition where the application fails to properly validate input boundaries during token parsing operations. When processing SVG documents, ImageMagick's parser attempts to extract coordinate values from user space definitions without adequate bounds checking, allowing attackers to manipulate the parsing flow through carefully crafted malicious content. This flaw specifically affects the heap memory management system where the application allocates memory for token processing but fails to ensure that read operations remain within allocated buffer boundaries. The vulnerability is particularly concerning because it operates at the core parsing layer of the application, making it a potential entry point for more sophisticated attacks.
From an operational perspective, this vulnerability enables remote attackers to execute information disclosure attacks by constructing malicious SVG files that trigger the buffer over-read condition. The impact extends beyond simple information leakage to potentially allow attackers to extract sensitive data from process memory, including cryptographic keys, authentication tokens, or other confidential information. The remote nature of this vulnerability means that attackers can exploit it without requiring local access to the target system, making it particularly dangerous in web applications or services that process untrusted image uploads. The unspecified other impacts mentioned in the description suggest that this vulnerability could potentially be leveraged for more severe consequences such as arbitrary code execution or denial of service conditions.
Security professionals should consider this vulnerability in the context of CWE-125 which specifically addresses out-of-bounds read conditions, and its alignment with ATT&CK technique T1059.1001 for executing malicious code through application-specific vulnerabilities. The vulnerability demonstrates the importance of proper input validation and memory management practices in multimedia processing libraries that handle complex file format parsing. Organizations should prioritize patching this vulnerability immediately, as it represents a high-risk exposure that could be exploited in automated attack scenarios targeting web applications or services that utilize ImageMagick for image processing. Mitigation strategies should include implementing strict file format validation, deploying web application firewalls, and ensuring that all ImageMagick installations are updated to versions that address this specific heap-based buffer over-read condition.