Product Defense in Depth

Summary

Defense in Depth (DiD) is a layered security strategy that combines multiple controls across various levels - application, network, physical, and operational - to protect systems and data. It ensures that even if one control fails, others remain in place to mitigate threats. A comprehensive DiD approach includes access controls, network segmentation, regular updates, attack prevention systems, and user education, forming a resilient security posture.

Security Capabilities and Defense-in-Depth Strategy

Application layer:

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• Authentication and Authorization - Ensures only authorized users can access devices administration and programming interfaces.
• Access control mechanism - prevents unauthorized access to the devices configurations and protects sensitive information.

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Network layer:

• NAC (Network Access Control) - Restricts network access to authorized and compliant devices based on predefined policies. Useful for enforcing posture checks and limiting lateral movement.
• Network encryption - Utilizes encryption mechanisms for wireless communication and IPsec.
• Network Firewall - Firewalls control ingress and egress network traffic based on predetermined security rules to prevent unauthorized access and traffic.
• Network Segmentation - Divides the network into smaller, isolated segments. Reduces the attack surface by isolating critical systems.
• VPN (Virtual Private Networks) - Encrypts data transmitted over the network and ensures secure communication channel for remote access.
• Network Failover System - Ensures continued network availability in the event of hardware, link, or service failure.
• Attack prevention - Mitigates the risks of most common network layer attacks (e.g.: DoS, SYN Flood).

Defense-in-Depth recommendations

The following defense in depth measures are recommended:

• Network Segmentation - Segment network to isolate different types of traffic and devices.
• Secure Access Controls - Utilize strong authentication and authorization mechanisms to control access to the network and devices.
• Regular Software Updates - Keep all software and firmware up to date to protect against known vulnerabilities.
• Change Default Configuration - Change default usernames, passwords, and settings on the device.
• Disable Unused Services - Turn off unused services and ports on the device to reduce the attack surface.
• Enable Security Features - Enable built-in and configurable security features such as SYN flood protection, HTTP attack mitigation, port scan detection, and rate-limiting.
• Physical Security - Restrict physical access to the device and other critical network hardware to authorized personnel only.