How to remediate – Grafana Labs Web Detection

1. Introduction

The web UI for Grafana Labs was detected on the remote host. This means a Grafana instance is accessible, potentially allowing attackers to gather information about the system and its configuration. Affected systems are typically those running Grafana monitoring software. A successful attack could lead to information disclosure.

2. Technical Explanation

The vulnerability occurs because the Grafana web UI is present on a host. While not an active exploit, it indicates a potential entry point for attackers who may attempt to discover further weaknesses or access sensitive data. There are no specific preconditions needed beyond network connectivity to the affected system.

• Root cause: The Grafana web UI is running and accessible.
• Exploit mechanism: An attacker could enumerate information about the Grafana instance, potentially leading to further exploitation if default credentials or known vulnerabilities are present.
• Scope: Systems running any version of Grafana with a publicly accessible web UI.

3. Detection and Assessment

You can confirm whether a system is vulnerable by checking for the presence of the Grafana web UI. A quick check involves using a web browser to access the default port (3000). A thorough method would involve network scanning tools.

• Quick checks: Accessing http://<host_ip>:3000 in a web browser will show the Grafana login page if running and accessible.
• Scanning: Nmap can detect the Grafana service using the script nmap -p 3000 --script http-title <host_ip>.
• Logs and evidence: Web server logs may show access attempts to port 3000 or related URLs.

http://<host_ip>:3000

4. Solution / Remediation Steps

The following steps outline how to address the detection of the Grafana web UI. These steps focus on securing or removing the instance if it is not required.

4.1 Preparation

• Services: If modifying the Grafana configuration, stop the Grafana service before editing grafana.ini. A roll back plan is to restore from the snapshot or revert the configuration file.
• Dependencies: Ensure you have access to the server and appropriate permissions to modify the Grafana configuration files. Change windows may be needed for production systems.

4.2 Implementation

1. Step 1: Stop the Grafana service if modifying the configuration file. (e.g., sudo systemctl stop grafana-server).
2. Step 2: Edit the grafana.ini file, typically located in /etc/grafana/.
3. Step 3: If the web UI is not required, consider removing Grafana entirely.

4.3 Config or Code Example

Before

[auth.anonymous]
enabled = true

After

[auth.anonymous]
enabled = false
hide_version = false

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help mitigate the risks associated with this vulnerability type.

• Least privilege: Limit access to Grafana and its configuration files to authorized personnel only.
• Secure defaults: Configure Grafana with strong authentication and authorization settings by default.

4.5 Automation (Optional)

# Example Ansible task to disable anonymous access
- name: Disable Grafana Anonymous Access
  lineinfile:
    path: /etc/grafana/grafana.ini
    regexp: '^enabled = true'
    line: 'enabled = false'
  notify: Restart Grafana

5. Verification / Validation

Confirm the fix by verifying that anonymous access is disabled and the version information is hidden. Re-test using a web browser to confirm changes.

• Post-fix check: Accessing http://<host_ip>:3000 should now require authentication.
• Re-test: Repeat the quick check from section 3, confirming that the login page is displayed and no version information is visible without authentication.
• Smoke test: Verify that authenticated users can still access Grafana dashboards and functionality as expected.
• Monitoring: Check Grafana logs for failed login attempts or unauthorized access attempts.

http://<host_ip>:3000 - should prompt for credentials

6. Preventive Measures and Monitoring

Preventive measures include regular security assessments and updates to Grafana.

• Baselines: Implement a security baseline that requires strong authentication and authorization settings for Grafana.
• Pipelines: Integrate vulnerability scanning into the CI/CD pipeline to identify potential weaknesses in Grafana configurations.
• Asset and patch process: Establish a regular patch cycle for Grafana to address known vulnerabilities promptly.

7. Risks, Side Effects, and Roll Back

• Risk or side effect 1: Disabling anonymous access may break existing integrations that rely on unauthenticated API calls.
• Roll back: Restore the original grafana.ini file and restart the Grafana service to re-enable anonymous access if needed.

8. References and Resources

Links related to this vulnerability.

• Vendor advisory or bulletin: https://grafana.com
• NVD or CVE entry: Not applicable for this informational detection.
• Product or platform documentation relevant to the fix: https://grafana.com/docs/grafana/latest/config-file/auth-anonymous/