CVE-2018-17334 in libsvg2
Summary
by MITRE
An issue was discovered in libsvg2 through 2012-10-19. A stack-based buffer overflow in the svgGetNextPathField function in svg_string.c allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact because a strncpy copy limit is miscalculated.
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Analysis
by VulDB Data Team • 03/26/2020
The vulnerability identified as CVE-2018-17334 represents a critical stack-based buffer overflow flaw within the libsvg2 library, specifically affecting versions released through October 19, 2012. This issue resides in the svgGetNextPathField function located within the svg_string.c source file, demonstrating a fundamental flaw in memory management and input validation that creates significant security implications for systems utilizing this graphics library. The vulnerability stems from an incorrect calculation of the copy limit used in a strncpy operation, which directly enables malicious actors to manipulate memory boundaries and potentially execute arbitrary code.
The technical implementation of this vulnerability involves the improper handling of string data during SVG path parsing operations, where the library fails to correctly calculate the maximum number of characters to copy from an input buffer. When processing malformed SVG content, particularly in path data elements, the miscalculated strncpy limit allows attackers to write beyond the allocated buffer boundaries, triggering a stack overflow condition. This flaw operates at the intersection of software security and graphics processing, where the parsing of vector graphics elements becomes a vector for memory corruption attacks. The vulnerability manifests as a denial of service condition through application crashes, but the potential for more severe impacts including code execution cannot be ruled out.
From an operational perspective, systems that process untrusted SVG content are at risk, particularly web applications, content management systems, and any software that renders vector graphics from external sources. The attack surface expands significantly when considering that SVG files are commonly used in web environments, email attachments, and digital publishing platforms, making this vulnerability particularly dangerous in enterprise and cloud environments. The impact extends beyond simple service disruption to potentially enabling remote code execution, which aligns with ATT&CK technique T1203 for legitimate program execution and CWE-121 for stack-based buffer overflow conditions. Organizations utilizing libsvg2 in their infrastructure face substantial risk exposure, especially those processing user-generated SVG content without proper input validation.
Mitigation strategies should prioritize immediate patching of affected libsvg2 versions, with particular attention to implementing proper input validation and bounds checking in SVG parsing routines. System administrators should deploy network segmentation and content filtering measures to prevent processing of untrusted SVG data, while also implementing robust application sandboxing for graphics processing components. The vulnerability highlights the importance of maintaining up-to-date third-party libraries and implementing comprehensive security testing procedures that include fuzzing and memory corruption analysis. Organizations should also consider implementing intrusion detection systems capable of identifying suspicious SVG processing patterns and establish incident response protocols specifically addressing buffer overflow vulnerabilities in graphics libraries. Regular security audits and vulnerability assessments should be conducted to identify similar issues in other graphics processing components that may share similar architectural flaws.