CVE-2018-3734: Path Traversal in stattic

Background

The stattic package is an npm package used for serving static files in Node.js applications. It allows developers to easily serve static assets such as HTML, CSS, JavaScript, and images. However, versions of stattic before 0.3.0 are vulnerable to a path traversal attack, which can be exploited by a remote attacker to read arbitrary files from the server. This vulnerability poses a high risk to the confidentiality of sensitive information stored on the server.

Vulnerability Detail

The vulnerability in stattic arises from insufficient input validation, allowing an attacker to manipulate file paths and access files outside of the intended directory. By exploiting this vulnerability, an attacker can read any file on the server, regardless of its extension. This could lead to the unauthorized disclosure of sensitive information, such as configuration files or user data. The vulnerability has been assigned a CVSS score of 7.5, indicating a high severity level.

npm install stattic@0.3.0

Workaround

If updating to the latest version is not immediately possible, a temporary workaround is to implement additional input validation and sanitization of user-supplied file paths. This can be done by checking that the requested file path is within the expected directory and does not contain any directory traversal characters. Here is an example of how to implement this workaround in Node.js:

const path = require('path');

function serveStaticFile(req, res) {
  const requestedFile = req.params.file;
  const basePath = '/path/to/static/files';
  const resolvedPath = path.resolve(basePath, requestedFile);

  if (!resolvedPath.startsWith(basePath)) {
    // Invalid file path
    res.status(400).send('Invalid file path');
    return;
  }

  // Serve the file
  // ...
}

Conclusion

In conclusion, the stattic package versions before 0.3.0 are vulnerable to a path traversal attack, which can be exploited to read arbitrary files from the server. To mitigate this vulnerability, it is crucial to update to version 0.3.0 or later. Implementing additional input validation and sanitization of file paths can serve as a temporary workaround until the update is applied. For further assistance and support in vulnerability remediation, please contact DevNack.com.

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