CVE-2024-33766 in lunasvg
Summary
by MITRE • 05/01/2024
lunasvg v2.3.9 was discovered to contain an FPE (Floating Point Exception) at blend_transformed_tiled_argb.isra.0.
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Analysis
by VulDB Data Team • 12/04/2024
The vulnerability identified as CVE-2024-33766 affects lunasvg version 2.3.9 and represents a floating point exception within the blend_transformed_tiled_argb.isra.0 function. This issue manifests during the processing of SVG graphics where the software encounters invalid floating point operations that trigger an exception handler. The vulnerability specifically occurs in the context of image blending operations when dealing with transformed tiled ARGB (Alpha, Red, Green, Blue) color channels, suggesting that the flaw is triggered during complex graphical rendering scenarios involving multiple transformations and tiling operations. The function name indicates this is part of a graphics processing pipeline where transformed images are blended together using tiled patterns, which is a common operation in vector graphics rendering.
The technical root cause of this vulnerability lies in the improper handling of floating point arithmetic operations within the graphics blending algorithm. When the blend_transformed_tiled_argb.isra.0 function processes certain combinations of transformed image data and tiling parameters, it likely encounters division by zero conditions, overflow scenarios, or other invalid floating point operations that are not properly guarded against. This type of vulnerability falls under the CWE-191 category of Integer Underflow and the broader CWE-189 classification for Numeric Errors. The issue demonstrates a lack of proper input validation and exception handling in the mathematical operations used for graphics blending, particularly when dealing with transformed coordinate systems and tiled image patterns.
The operational impact of this vulnerability extends beyond simple program termination, as it can potentially enable denial of service attacks against applications that rely on lunasvg for SVG rendering. Attackers could craft malicious SVG files that specifically trigger the floating point exception when processed by vulnerable software, leading to application crashes or system instability. This vulnerability affects any software ecosystem that utilizes lunasvg v2.3.9 for vector graphics processing, including web browsers, graphic design applications, document viewers, and content management systems. The attack surface is particularly broad given that SVG format is widely used across web applications and digital publishing platforms, making this a significant concern for organizations that process untrusted SVG content.
Security mitigations for CVE-2024-33766 should prioritize immediate software updates to versions that address the floating point exception handling issues within the blend_transformed_tiled_argb.isra.0 function. Organizations should implement input validation measures to sanitize SVG files before processing, particularly focusing on detecting and rejecting malformed transformation parameters that could lead to invalid floating point operations. The ATT&CK framework categorizes this vulnerability under T1203 - Exploitation for Client Execution, as it represents a potential vector for executing malicious code through compromised graphics rendering pipelines. Additionally, implementing proper exception handling and graceful degradation mechanisms within the graphics processing code can help prevent complete system crashes. Network segmentation and application whitelisting can provide additional defense-in-depth measures, while regular security audits of graphics processing libraries should be conducted to identify similar numeric error vulnerabilities. Organizations should also consider deploying intrusion detection systems that can monitor for unusual patterns in graphics processing that might indicate exploitation attempts targeting this type of numeric error.