How to remediate – Centreon Detection

1. Introduction

Centreon Detection indicates the presence of Centreon, an IT infrastructure and application monitoring application, on a remote host. This software is used to monitor network devices, servers, and applications, providing alerts when issues occur. Detecting its web interface suggests potential exposure of management functionality. A successful exploit could lead to information disclosure or denial of service.

2. Technical Explanation

The vulnerability lies in the presence of Centreon’s web interface, which may be accessible without proper authentication or with known default credentials. Attackers can potentially gain access to sensitive monitoring data and configurations. There is no specific CVE associated with simply detecting the application; however, vulnerabilities are often found within Centreon itself that could be exploited once identified.

• Root cause: The web interface for Centreon is running and accessible, indicating a potential attack surface.
• Exploit mechanism: An attacker could attempt to access the web interface using default credentials or exploit known vulnerabilities in the application.
• Scope: All systems running Centreon with an exposed web interface are affected.

3. Detection and Assessment

Confirming the presence of Centreon can be done through simple checks and network scanning.

• Quick checks: Access the remote host in a web browser using default ports (typically 80 or 443). Look for the Centreon login page.
• Scanning: Nessus plugin ID 16729 can detect Centreon installations. This is an example only, and other scanners may provide similar functionality.
• Logs and evidence: Web server logs may show access attempts to Centreon’s web interface paths (e.g., /centreon/).

curl -I http://{target_ip}

4. Solution / Remediation Steps

The primary solution is to secure or remove the Centreon installation.

4.1 Preparation

• Services: Stop the Centreon web server if possible, to prevent further access during remediation.
• Rollback: Restore the snapshot if issues occur.

4.2 Implementation

1. Step 1: Change default credentials for all Centreon accounts. Use strong, unique passwords.
2. Step 2: Restrict network access to the Centreon web interface using firewall rules. Allow only trusted IP addresses.
3. Step 3: If Centreon is not required, uninstall it from the system.

4.3 Config or Code Example

This example shows restricting access via a basic firewall rule.

Before

# No specific rules for Centreon traffic

After

iptables -A INPUT -p tcp --dport 80 -s {trusted_ip} -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s {trusted_ip} -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help mitigate this risk.

• Least privilege: Limit user access to only the necessary Centreon functionalities.
• Network segmentation: Isolate Centreon on a separate network segment with restricted access.

4.5 Automation (Optional)

Automation is not directly applicable for this detection, but firewall rules can be automated.

# Example Ansible playbook snippet to add firewall rule
- name: Block Centreon traffic from untrusted sources
  iptables:
    chain: INPUT
    protocol: tcp
    destination_port: 80,443
    jump: DROP

5. Verification / Validation

Confirm the fix by verifying restricted access and checking for default credentials.

• Post-fix check: Attempt to access the Centreon web interface from an untrusted IP address. Access should be blocked.
• Re-test: Re-run the initial curl command from a different network. It should no longer return a successful response.
• Smoke test: Verify that authorized users can still access Centreon’s functionality as expected.

curl -I http://{target_ip}

6. Preventive Measures and Monitoring

Proactive measures include regular security assessments and monitoring.

• Baselines: Include Centreon in your standard security baseline, checking for default credentials and unnecessary services.
• Pipelines: Integrate vulnerability scanning into CI/CD pipelines to identify potential exposures early on.

7. Risks, Side Effects, and Roll Back

Restricting access may disrupt legitimate users if not configured correctly.

• Risk or side effect 1: Blocking authorized user access. Mitigation: Carefully configure firewall rules and test thoroughly.
• Roll back: Remove the added firewall rules to restore full access.

8. References and Resources

Refer to official Centreon documentation for further information.

• Vendor advisory or bulletin: https://www.centreon.com/