CVE-2018-9206: Unrestricted Upload of File with Dangerous Type in blueimp-file-upload

Background

The blueimp-file-upload package is an npm package that provides a file upload functionality for web applications using jQuery. It allows users to upload files to a server, and it is commonly used in various web applications. However, versions of the package up to v9.22.0 are vulnerable to an unauthenticated arbitrary file upload vulnerability.

Vulnerability Detail

The vulnerability in blueimp-file-upload allows an attacker to upload arbitrary files to the server without any authentication. This can lead to various security issues, such as remote code execution, unauthorized access to sensitive files, or denial of service attacks. The vulnerability is caused by a lack of proper validation and filtering of file types during the upload process. As a result, an attacker can upload files with dangerous types, such as executable files or scripts, which can be executed on the server.

npm install blueimp-file-upload@9.22.1

Workaround

If updating the package is not immediately possible, a temporary workaround is to disable file uploads or implement additional security measures, such as file type validation and filtering, on the server-side. Here is an example of how to implement file type validation in Node.js using the mime-types package:

const mime = require('mime-types');

function validateFileType(file) {
  const allowedTypes = ['image/jpeg', 'image/png', 'application/pdf'];
  const fileType = mime.lookup(file.name);
  if (!allowedTypes.includes(fileType)) {
    throw new Error('Invalid file type');
  }
}

Conclusion

The blueimp-file-upload package up to version 9.22.0 is vulnerable to an unauthenticated arbitrary file upload issue. This can lead to severe security risks, including remote code execution and unauthorized access to sensitive files. It is crucial to update the package to version 9.22.1 or later and implement proper file type validation and filtering to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for blueimp-file-upload →

FAQ