1. Introduction
The web interface for Fortinet FortiNAC was detected on the remote host. This vulnerability relates to a Secure Network Access Control product and could allow an attacker to gain access to sensitive information or control of the system. Systems running FortiNAC with a publicly accessible web interface are usually affected, potentially impacting confidentiality, integrity, and availability.
2. Technical Explanation
The detection indicates that the FortiNAC web interface is exposed on the network. This interface allows administrators to manage the Secure Network Access Control system. An attacker gaining access could compromise the entire NAC infrastructure. There are no known CVEs associated with this specific detection, but it represents a high-risk configuration issue.
- Root cause: The web interface is accessible from outside of the intended network segment.
- Exploit mechanism: An attacker can attempt to exploit vulnerabilities in the web interface or use valid credentials obtained through other means (e.g., phishing, brute force) to gain access.
- Scope: Fortinet FortiNAC products with a web interface are affected.
3. Detection and Assessment
Confirming exposure involves checking if the web interface is accessible from outside the network. A thorough assessment includes reviewing the configuration of the FortiNAC appliance.
- Quick checks: Use
nmap -p 80,443 <FortiNAC_IP>to check for open ports associated with web services. - Scanning: Nessus plugin ID 16729 can identify the FortiNAC web interface. This is an example only and may require updates.
- Logs and evidence: Check FortiNAC logs for access attempts to the web interface from unexpected sources.
nmap -p 80,443 <FortiNAC_IP>4. Solution / Remediation Steps
The following steps outline how to secure the FortiNAC web interface.
4.1 Preparation
- Ensure you have valid credentials for accessing the FortiNAC appliance. A roll back plan involves restoring the previous configuration backup.
- A change window is recommended due to potential disruption of NAC services. Approval from a senior administrator is advised.
4.2 Implementation
- Step 1: Restrict access to the FortiNAC web interface using firewall rules, allowing only trusted IP addresses or networks.
- Step 2: Enable multi-factor authentication (MFA) for all administrative accounts accessing the web interface.
- Step 3: Review and update default credentials if they have not already been changed.
4.3 Config or Code Example
Before
# Firewall rule allowing access from any source to port 80/443
allow all to any port 80,443
After
# Firewall rule allowing access only from trusted network
allow <trusted_network> to any port 80,443
deny all to any port 80,443
4.4 Security Practices Relevant to This Vulnerability
Several security practices can help prevent this issue.
- Practice 1: Least privilege – restrict access to the web interface only to those who need it.
- Practice 2: Network segmentation – isolate the FortiNAC appliance on a secure network segment.
4.5 Automation (Optional)
Automation is not directly applicable for this specific detection, as it relates to configuration.
5. Verification / Validation
Confirming the fix involves verifying that access to the web interface is restricted and MFA is enabled.
- Post-fix check: Use
nmap -p 80,443 <FortiNAC_IP>from an untrusted source. The scan should not show open ports. - Re-test: Re-run the initial nmap scan to confirm that access is blocked.
- Smoke test: Verify that authorized administrators can still log in to the web interface using MFA.
- Monitoring: Monitor FortiNAC logs for failed login attempts from unexpected sources.
nmap -p 80,443 <FortiNAC_IP>6. Preventive Measures and Monitoring
Preventive measures include regularly reviewing security baselines and implementing checks in CI/CD pipelines.
- Baselines: Update a security baseline to require restricted access to the FortiNAC web interface.
- Pipelines: Add checks in deployment pipelines to ensure that firewall rules are correctly configured.
- Asset and patch process: Implement a regular review cycle for network device configurations.
7. Risks, Side Effects, and Roll Back
Restricting access could disrupt legitimate administrative access if not properly planned.
- Roll back: Restore the previous firewall configuration and disable any new restrictions.
8. References and Resources
Links to official advisories and documentation.
- Vendor advisory or bulletin: https://www.fortinet.com/products/network-access-control