CVE-2024-57723 - Lunasvg v3.. Segmentation Violation in Component Composition_source_over: Exploit Details, Code Snippet, and References

A security vulnerability has been identified in the lunasvg v3.. library (CVE-2024-57723), which could lead to a segmentation violation in the component composition_source_over. This vulnerability has a wide range of potential impacts on systems that use the lunasvg library. In this post, we'll provide a code snippet demonstrating the vulnerability, links to the original references, and an in-depth analysis of the exploit details.

Exploit Details

The security vulnerability in CVE-2024-57723 lies in the component composition_source_over of the lunasvg library. When exploited, the vulnerability can cause a segmentation violation, which will typically lead to crashing the application. This disruption can lead to a Denial-of-Service (DoS) attack, making the affected system unavailable for users.

This vulnerability stems from how the lunasvg library improperly handles memory allocation in the composition_source_over function. This memory mishandling can be exploited using a specially crafted SVG file, resulting in a segmentation fault. An attacker can trigger this vulnerability by convincing a user to open or view a malicious SVG file using software dependent on the lunasvg library.

An example of a code snippet that could exploit the vulnerability is provided below

#include <lunasvg/svgdocument.h>
#include <iostream>

int main(int argc, char** argv) {
  if (argc != 2) {
    std::cerr << "Usage: " << argv[] << " <input_svg_file>" << std::endl;
    return 1;
  }

  std::string input_filename = argv[1];
  lunasvg::SVGDocument document;
  bool result = document.loadFromFile(input_filename);

  if (!result) {
    std::cerr << "Could not load the SVG file: " << input_filename << std::endl;
    return 1;
  }

  lunasvg::Bitmap bitmap = document.renderToBitmap();
  // Here, the composition_source_over function can cause segmentation violation.

  return ;
}

In this example, the exploit occurs when the user tries to render the malicious SVG file using the lunasvg library’s in-build renderToBitmap function.

Links to Original References

1. Lunasvg official repository: https://github.com/sammycage/lunasvg
2. CVE-2024-57723 Official Description: https://nvd.nist.gov/vuln/detail/CVE-2024-57723
3. Composition and Blending in SVG: https://www.w3.org/TR/SVGCompositing/

Mitigation

To mitigate this vulnerability, the developers of the lunasvg library should properly handle memory allocation in the composition_source_over function. This will prevent the segmentation violation from occurring when loading a malicious SVG file. Users should upgrade the lunasvg library to a version that has patched the vulnerability.

In the meantime, as a user, be cautious when opening SVG files from untrusted sources or consider using alternative libraries for rendering SVG files if the affected software is deemed critical.

Conclusion

In this post, we explored the details of the CVE-2024-57723 vulnerability in the lunasvg v3.. library. We highlighted the importance of addressing this security issue and provided a code snippet, original references, and information on how to mitigate the vulnerability. By staying informed and vigilant about such security vulnerabilities, developers and users can protect their systems and software from potential exploits.

Timeline

Published on: 01/23/2025 01:15:27 UTC
Last modified on: 03/18/2025 21:15:32 UTC