Missing server configuration to reduce server fingerprinting

• Rule ID: javascript_express_reduce_fingerprint
• Languages: javascript
• Source: reduce_fingerprint.yml

Description

Reducing server fingerprinting enhances security by making it harder for attackers to identify the software your server is running. Server fingerprinting involves analyzing the unique responses of server software to specific requests, which can reveal information about the server's software and version. While not a direct security vulnerability, minimizing this information leakage is a proactive step to obscure details that could be used in targeted attacks.

Remediations

• Do disable the X-Powered-By header in Express.js applications to prevent revealing the server's technology stack. Use the app.disable() method to achieve this.

  app.disable('x-powered-by');

References

• Express Security Best Practices

Associated CWE

• CWE-693: Protection Mechanism Failure

Configuration

To skip this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --skip-rule=javascript_express_reduce_fingerprint

To run only this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --only-rule=javascript_express_reduce_fingerprint