How to remediate – Form With Password Detected

1. Introduction

This notice reports a Form With Password Detected vulnerability. This means a web form that requests a password has been identified on your systems. This poses a risk to confidentiality as passwords could be intercepted or compromised. Systems commonly affected are any web applications accepting user credentials. A successful exploit could lead to credential theft and unauthorised access.

2. Technical Explanation

The vulnerability occurs when a form designed for password input is detected during scanning. This isn’t necessarily an active exploit, but indicates a potential risk area requiring review. Exploitation typically involves intercepting the submitted credentials via methods like man-in-the-middle attacks or cross-site scripting (XSS) if other vulnerabilities are present. The precondition is that a user submits data through the form while not using a secure connection (HTTPS).

• Root cause: A web application contains a form requesting password input.
• Exploit mechanism: An attacker could intercept the submitted credentials during transmission if HTTPS isn’t used, or leverage XSS to steal the password directly from the user’s browser.
• Scope: Any web server hosting applications with forms that accept passwords.

3. Detection and Assessment

To confirm vulnerability, first check for HTTPS usage on affected forms. A thorough method involves reviewing application source code for insecure password handling practices.

• Quick checks: Use your browser’s developer tools to inspect the form’s attributes and verify it uses `https://` in the action URL.
• Scanning: Nessus or similar scanners may flag this as a low-severity information disclosure issue.
• Logs and evidence: Web server access logs will show requests to the form’s endpoint.

curl -I https://example.com/loginform 

4. Solution / Remediation Steps

Fix this issue by ensuring all password forms use HTTPS and implement strong security practices.

4.1 Preparation

• Ensure you have access to modify the web server’s configuration files. A roll back plan is to restore the previous configuration from backup.
• Change windows may be needed for production systems, requiring approval from security and application owners.

4.2 Implementation

1. Step 1: Configure your web server to enforce HTTPS redirection for all traffic.
2. Step 2: Update the form’s action attribute to use `https://` instead of `http://`.
3. Step 3: Verify that SSL/TLS certificates are valid and properly configured.

4.3 Config or Code Example

Before

<form action="http://example.com/login" method="post">

After

<form action="https://example.com/login" method="post">

4.4 Security Practices Relevant to This Vulnerability

Several security practices directly address this vulnerability type. Least privilege reduces the impact of a potential compromise. Input validation prevents malicious data from being processed. Safe defaults ensure secure configurations are used by default.

• Practice 1: Use HTTPS for all web traffic to encrypt sensitive data in transit.
• Practice 2: Implement input validation on all forms to prevent injection attacks.

4.5 Automation (Optional)

If using a configuration management tool, automate the enforcement of HTTPS redirection and SSL/TLS certificate validity checks.

# Example Ansible snippet
- name: Ensure HTTPS redirection is enabled
  apache2_module:
    name: rewrite
    state: present
- name: Configure HTTPS virtual host
  template:
    src: https_vhost.conf.j2
    dest: /etc/apache2/sites-available/example.com.conf
  notify: Restart Apache

5. Verification / Validation

Confirm the fix by verifying HTTPS is enabled for the affected form and that SSL/TLS certificates are valid. Re-run the initial detection to confirm the issue is resolved.

• Post-fix check: Use your browser’s developer tools to verify the form uses `https://` in the action URL, and that a valid SSL certificate is present.
• Re-test: Re-run the scanner used earlier; it should no longer flag the vulnerability.
• Smoke test: Test logging into the application with valid credentials to ensure functionality remains intact.
• Monitoring: Monitor web server logs for any errors related to SSL/TLS certificate validation or HTTPS redirection.

curl -I https://example.com/loginform 

6. Preventive Measures and Monitoring

Update security baselines to require HTTPS for all web applications. Implement checks in CI/CD pipelines to prevent insecure configurations from being deployed. Establish a regular patch or configuration review cycle to identify and address potential vulnerabilities.

• Baselines: Update your security baseline to enforce HTTPS for all web applications, including specific SSL/TLS certificate requirements (e.g., minimum TLS version).
• Pipelines: Add SAST checks to scan application code for insecure password handling practices.

7. Risks, Side Effects, and Roll Back

Enforcing HTTPS may cause compatibility issues with older browsers or clients that do not support TLS 1.2 or higher. Ensure proper certificate management to avoid service disruptions due to expired certificates.

• Risk or side effect 1: Compatibility issues with older clients; provide a workaround if possible (e.g., offer an alternative login method).
• Risk or side effect 2: Service disruption due to invalid SSL/TLS certificate; monitor certificate expiration dates and renew promptly.
• Roll back: Restore the previous web server configuration from backup, including any changes made during implementation.

8. References and Resources

• Vendor advisory or bulletin: [If a vendor advisory exists, link it here]
• NVD or CVE entry: N/A (This is an informational finding, not a specific CVE)
• Product or platform documentation relevant to the fix: [Link to your web server’s HTTPS configuration documentation]