Bifrozt

Bifrozt is a NAT device with a built-in DHCP server, typically deployed with one NIC connected to the Internet and another NIC connected to the internal network. It stands out from standard NAT devices due to its unique ability to function as a transparent SSHv2 proxy, enabling detailed monitoring and logging of SSH traffic between an attacker and a honeypot.

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Key Features

1. Transparent SSHv2 Proxy

• Acts as an intermediary between attackers and the honeypot deployed on the internal network.
• Logs all SSH interactions to a TTY file in plain text for later review.
• Captures copies of any files downloaded during the SSH session.

2. Deployment Simplicity

• No additional software, kernel modules, or specific operating system versions are required on the internal SSH server.
• Works seamlessly with any SSH server deployed on the internal network.

3. Traffic Control

• Limits outbound traffic to a predefined set of ports.
• Drops outbound packets on these ports when specific traffic thresholds are exceeded, helping mitigate potential abuse by attackers.

4. Dual-NIC Setup

• One NIC is connected directly to the Internet, providing external access.
• The second NIC is connected to the internal network, hosting the honeypot and internal devices.

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How It Works

1. Setup:

   • Deploy Bifrozt with one NIC connected to the Internet and another to the internal network.
   • Configure the internal network to host an SSH server or other honeypot services.

2. Transparent Proxy:

   • Bifrozt intercepts SSH connections and proxies them transparently to the internal SSH server.
   • Logs all session data and file transfers in real time.

3. Traffic Management:

   • Monitors outbound traffic and enforces limits to prevent misuse of the internal network.

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Advantages

• Ease of Deployment: Works with existing SSH servers without requiring modifications or specific operating systems.
• Comprehensive Logging: Captures plain text logs and downloaded files for detailed analysis.
• Traffic Regulation: Limits outbound traffic to mitigate abuse or attacks originating from the honeypot.
• Transparent Operation: Does not interfere with or require changes to the SSH server setup.

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Use Cases

• Honeypot Deployment: Monitor attacker behavior and tactics in real-time through a transparent SSH proxy.
• Incident Analysis: Collect detailed logs of attacker interactions for forensic analysis.
• Threat Intelligence: Gain insights into attacker methods, tools, and objectives.

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Conclusion

Bifrozt is an effective solution for deploying SSH honeypots in a network environment. Its ability to transparently proxy and log SSH traffic, combined with outbound traffic control, makes it a powerful tool for monitoring and analyzing unauthorized access attempts. The simplicity of deployment and comprehensive logging capabilities make it a standout choice for organizations seeking to enhance their network security posture.

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