CVE-2024-57719 - Lunasvg v3.. Segmentation Violation in Blend_transformed_tiled_argb.isra. Component

A recent vulnerability has been discovered in Lunasvg v3.., which is an open-source SVG rendering library. The vulnerability identified as CVE-2024-57719 consists of a segmentation violation that occurs within the blend_transformed_tiled_argb.isra. component. In this post, we will break down the details of the exploit, provide the code snippet responsible for this vulnerability, along with the original references that discovered this issue.

Exploit Details

The segmentation violation takes place in the blend_transformed_tiled_argb.isra. component, causing the application to crash. This possibility of a segmentation fault opens potential avenues for denial of service attacks resulting from targeted exploitation.

The following code snippet is associated with the vulnerability

Void blend_transformed_tiled_argb(isra.)(const BlendArgs *args) {
  //... (remaining code)
  byte t = src->linear[int(y)][int(x)][c];
  byte t1 = src->linear[int(y1)][int(x)][c];
  byte t2 = src->linear[int(y)][int(x1)][c];
  byte t3 = src->linear[int(y1)][int(x1)][c];
  //... (remaining code)
}

The issue arises from the improper handling of the array indices, which can lead to a potential segmentation fault, affecting the stability of the application.

Original Reference

The vulnerability was first discovered and reported in a GitHub issue: https://github.com/sammycage/lunasvg/issues/65. The issue provides details about the segmentation violation and the context where it occurs within the Lunasvg codebase.

Mitigation

As of now, there is no patch available for CVE-2024-57719 in the Lunasvg v3.. library. Developers who make use of Lunasvg in their projects should keep tabs on the project's GitHub repository (https://github.com/sammycage/lunasvg) and update to the latest version as soon as a patch is released.

Possible Prevention Measures

In the meantime, to reduce the risk of exploitation by CVE-2024-57719, the following prevention measures can be taken:

1. Bounds Check: Ensure proper boundary checks for the array indices are put in place, and handle edge cases accordingly.

if (int(x) <  || int(y) <  || int(x) >= src->width || int(y) >= src->height) { 
    // Invalid index, handle appropriately 
}

2. Regularly Update Dependencies: Keep your project's dependencies, including Lunasvg, up-to-date and regularly check for patches and updates, ensuring that potential vulnerabilities are addressed as they are discovered.

Conclusion

CVE-2024-57719 presents a significant concern, as it exposes a segmentation violation vulnerability in the popular Lunasvg library. Developers should be aware of the issue and take appropriate measures to mitigate the risk of exploitation. By implementing necessary checks in code and staying up-to-date with the latest patches and fixes, developers can help protect their applications from potential denial of service or other attacks.

Timeline

Published on: 01/23/2025 01:15:26 UTC
Last modified on: 03/22/2025 15:15:38 UTC