CVE-2024-34350: An In-Depth Analysis of Next.js Response Queue Poisoning Vulnerability, Exploit Details, and Mitigation Measures

Next.js, a widely-used React framework, offers developers the necessary building blocks to create scalable and efficient web applications. However, before the release of version 13.5.1, Next.js had a significant vulnerability due to an inconsistent interpretation of crafted HTTP requests. This inconsistency resulted in treating certain requests as simultaneously single and separate requests, leading to desynchronized responses and, consequently, a response queue poisoning vulnerability.

Exploit Details

The vulnerability, designated as CVE-2024-34350, was explicitly present in scenarios when the affected route made use of the rewrites feature in Next.js. You can learn more about the rewrites feature in the official documentation here.

The vulnerability allowed attackers to poison the response queue with their crafted request, resulting in exposing sensitive information, bypassing security measures, or causing other unintended consequences.

In your next.config.js file, include the following rewrite rule

module.exports = {
  async rewrites() {
    return [
      {
        source: '/test/:path',
        destination: '/api/:path',
      },
    ];
  },
};

2. Start the Next.js development server and make an HTTP request to the /test/example endpoint.

3. Observe that the response from the /api/example endpoint is not properly returned, leading to desynchronization and potential queue poisoning.

Mitigation Measures

To resolve this vulnerability, users should update their Next.js installations to version 13.5.1 or later. This version contains a patch that addresses the issue and ensures the consistent parsing of crafted HTTP requests. Users can upgrade their installation by modifying their package.json file and updating the dependency to the required version:

{
  "dependencies": {
    "next": "13.5.1",
    "react": "17..2",
    "react-dom": "17..2"
  }
}

Once you've updated your package.json file, run npm install or yarn install to update the dependencies, and restart your Next.js development server.

Conclusion

The CVE-2024-34350 vulnerability in Next.js has significant security implications, as it allows attackers to poison response queues and exploit desynchronized responses. To protect applications against this vulnerability, developers are urged to update their Next.js installations to version 13.5.1 or newer, which provides a patch that ensures consistent parsing of crafted HTTP requests and prevents response queue poisoning. Stay vigilant and keep your software up to date to minimize the risk of exposing your Next.js applications to potential threats.

Timeline

Published on: 05/14/2024 15:38:41 UTC
Last modified on: 08/02/2024 02:51:11 UTC