CVE-2021-45851: Server-Side Request Forgery in FUXA

Background

FUXA is an npm package developed by the FrangoTeam. It is a server-side application that provides functionality for managing and controlling industrial automation systems. FUXA is vulnerable to a Server-Side Request Forgery (SSRF) attack, which allows an attacker to manipulate the server into making requests to arbitrary destinations. This can lead to the disclosure of sensitive information from the server's internal environment and services, and potentially enable the execution of malicious commands on the server.

Vulnerability Detail

The SSRF vulnerability in FUXA arises from a failure to properly validate user-supplied input. By crafting a malicious request, an attacker can trick the server into making requests to internal resources or external systems. This can result in the disclosure of sensitive information, such as credentials or internal IP addresses, and potentially enable further attacks against the server or other systems. The vulnerability has a CVSS score of 7.5, indicating a high severity level.

Workaround

If updating to the latest version is not immediately feasible, a temporary workaround can be implemented by implementing server-side input validation and whitelisting of allowed destinations for requests. This can help prevent the exploitation of the SSRF vulnerability by restricting the server's ability to make requests to unauthorized or potentially malicious destinations. Here is an example of how to implement input validation and whitelisting in Node.js:

const allowedDestinations = ['example.com', 'api.example.com'];

function validateRequest(url) {
  const parsedUrl = new URL(url);
  if (allowedDestinations.includes(parsedUrl.hostname)) {
    // Process the request
  } else {
    // Handle unauthorized destination
  }
}

Conclusion

The SSRF vulnerability in FUXA (CVE-2021-45851) poses a significant risk to the security of industrial automation systems. It allows an attacker to manipulate the server into making requests to arbitrary destinations, potentially leading to the disclosure of sensitive information and the execution of malicious commands. To mitigate this vulnerability, it is crucial to update to the latest version of FUXA (1.1.4 or later) and implement proper input validation and whitelisting techniques. For further support on vulnerability remediation, please contact DevNack.com.

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