CVE-2017-16148: Directory Traversal in serve46

Background

The serve46 package is an npm package used for local development. It provides functionality for serving files over HTTP. However, it is vulnerable to a directory traversal vulnerability. This vulnerability allows an attacker to access files outside of the intended directory root, potentially leading to the disclosure of private files on the vulnerable system.

Vulnerability Detail

The vulnerability in serve46 arises from the package's resolution of relative file paths. By manipulating the file path in a specific way, an attacker can traverse directories and access files outside of the intended directory root. For example, an attacker can send a GET request with a crafted file path like GET /../../../etc/passwd to retrieve the /etc/passwd file. This can result in the exposure of sensitive information.

Workaround

As there is no patch available, a possible workaround is to manually implement file serving functionality in your application, ensuring that proper security measures are in place to prevent directory traversal attacks. Here is an example of how you can serve files using the express package:

const express = require('express');
const path = require('path');

const app = express();

app.get('/files/*', (req, res) => {
  const filePath = path.join(__dirname, req.params[0]);
  res.sendFile(filePath);
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Conclusion

The serve46 package is vulnerable to a directory traversal vulnerability that allows an attacker to access files outside of the intended directory root. No patch is available for this vulnerability, so it is recommended to use the package only for local development purposes. If the functionality is needed for production, it is advised to use a different package or implement your own file serving functionality with proper security measures. For more information and support on vulnerability remediation, please contact DevNack.com.

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