Industrial Network Attack and Defense Drills: Guide to Fixing Configuration Vulnerabilities in Cellular Router and Firewalls, Along with Practical Strategies
In today's era of deep integration between Industry 4.0 and the Internet of Things (IoT), industrial networks have become the core infrastructure for smart manufacturing. However, with the upgrading of cyberattack methods, configuration vulnerabilities in cellular router and firewalls have emerged as major security threats faced by enterprises. From the perspective of attack and defense drills, this article combines real-world cases and practical guides to deeply analyze common vulnerability types, repair methods, and defense strategies for cellular router and firewalls in industrial networks. It also recommends a hardware device suitable for industrial scenarios—the USR-G809s cellular router—to assist enterprises in building a proactive defense system.

1.Core Objectives and Typical Scenarios of Industrial Network Attack and Defense Drills
Industrial network attack and defense drills aim to verify the security of enterprise networks by simulating real attack paths, identify potential vulnerabilities, and optimize defense strategies. The core objectives include:
Vulnerability Discovery: Identifying configuration flaws in devices such as cellular router and firewalls (e.g., weak passwords, unauthorized access, protocol vulnerabilities).
Attack Path Validation: Simulating attackers exploiting vulnerabilities to penetrate the internal network and verifying the effectiveness of existing security measures.
Defense Strategy Optimization: Adjusting security strategies based on drill results to enhance overall system resilience.
Typical Scenario Example:
A car manufacturing enterprise discovered through an attack and defense drill that the cellular router on its production line had vulnerabilities such as unclosed default management ports and unencrypted SNMP protocols. Attackers exploited these vulnerabilities to gain control of the devices and tamper with PLC parameters, causing production line shutdowns. After the drill, the enterprise successfully intercepted similar attacks by fixing vulnerabilities and deploying firewall rules.
2. Common Vulnerability Types and Repair Methods for Cellular Router and Firewalls
2.1 Weak Passwords and Unauthorized Access
Vulnerability Principle: Devices with unchanged default passwords or insufficient password complexity allow attackers to gain management privileges through brute-force attacks or social engineering.
Repair Methods:
Enforce Password Policies: Set strong passwords containing uppercase and lowercase letters, numbers, and special characters, and change them regularly.
Multi-Factor Authentication (MFA): Enhance authentication security by combining SMS verification codes and hardware tokens.
Case Reference: An energy enterprise deployed the USR-G809s cellular router and used its built-in firewall module to enforce MFA on all management interfaces, successfully resisting brute-force attacks.

2.2 Unencrypted Communication Protocols
Vulnerability Principle: Protocols such as SNMP and Telnet without encryption allow data to be stolen or tampered with during transmission.
Repair Methods:

• Protocol Replacement: Use SSH instead of Telnet and SNMPv3 instead of SNMPv1/v2c.
• VPN Encryption Tunnels: Establish encrypted channels through IPSec VPN or OpenVPN to protect remote access security.
  Practical Steps:
• Enable SSH services and disable Telnet in the USR-G809s.
• Configure IPSec VPN, setting a pre-shared key (PSK) and AES-256 encryption algorithm.
• Verify VPN connection stability to ensure data transmission integrity.

2.3 Improper Firewall Rule Configuration
Vulnerability Principle: Overly permissive firewall rules (e.g., allowing all inbound traffic) or failure to restrict high-risk ports (e.g., 22, 3389).
Repair Methods:

• Principle of Least Privilege: Allow only necessary IPs, ports, and protocols through the firewall.
• Security Zone Segmentation: Divide the network into trusted zones (internal network), untrusted zones (external network), and DMZ zones to isolate devices with different security levels.
  Case Reference: A chemical enterprise used the VLAN function of the USR-G809s to isolate the production network from the management network and configured firewall rules to restrict cross-network segment access, successfully blocking APT attacks.

2.4 Firmware and Software Vulnerabilities
Vulnerability Principle: Unpatched known vulnerabilities (e.g., CVE-numbered vulnerabilities) in device firmware or software are exploited by attackers to execute malicious code.
Repair Methods:

• Regular Patch Updates: Monitor firmware updates released by vendors and promptly fix high-risk vulnerabilities.
• Vulnerability Scanning Tools: Use tools such as Nessus and OpenVAS to regularly scan devices for vulnerabilities.
  Practical Steps:
• Log in to the USR-G809s management interface and check the firmware version.
• Download the latest firmware released by the vendor and complete the update through local upgrades or cloud-based delivery.
• Verify that device functions are normal after the update to avoid business interruptions caused by patches.

USR-G809s Cellular Router: A Security Protection Tool Designed for Industrial Scenarios

Choosing hardware devices suitable for the scenario is crucial in industrial network attack and defense drills. The USR-G809s cellular router, with its all-scenario network support, multi-layered security protection, and intelligent management functions, has become the preferred solution for industrial enterprises:

• Supports 5G/4G/Wi-Fi 6/wired multi-network backup to ensure network continuity.
• Integrates 8GB of large storage and Python secondary development capabilities to meet customized needs.
  Multi-Layered Security Protection:
• Built-in firewall module supporting IP/MAC binding, port filtering, and intrusion detection.
• Supports national cryptographic SM2/SM4 encryption algorithms to meet compliance requirements of the Cybersecurity Classification Protection 2.0.
• Hardware-level watchdog circuit and wide-temperature design (-40℃~75℃) to adapt to harsh industrial environments.
  Intelligent Management:
• Remote configuration, firmware upgrades, and log auditing through the USR Cloud platform.
• Supports SNMP Trap alerts and SMS/email notifications to respond to security events in real time.
  Application Case:
  After deploying the USR-G809s in a smart agriculture project, its VPN encryption function and firewall rules successfully resisted man-in-the-middle attacks targeting meteorological monitoring equipment, ensuring data transmission security and business continuity.

Contact Us: Submit Requirements to Obtain Customized Penetration Testing Services
To help enterprises comprehensively enhance their industrial network security protection capabilities, we offer the following services:

Free Security Audit Template Download:

• Includes log format specifications, audit report samples, and gap analysis tables. Click the link to access: [Security Audit Template Download Portal].

Customized Penetration Testing Services:

• Service Content: Simulate real attack paths to detect vulnerabilities in cellular router, firewalls, PLCs, and other devices, and provide repair recommendations.
• Service Process: Requirements confirmation → penetration testing → report generation → repair guidance → retesting and verification.
• Submission Method: Scan the QR code below or visit the official website [link] to fill out the requirements form. Our security experts will contact you within 24 hours.

Expert Consulting Services:

• Provide on-site guidance by a team with Cybersecurity Classification Protection Evaluator qualifications to ensure compliance with Cybersecurity Classification Protection 2.0 standards at every step.

From Passive Defense to Proactive Immunity
The complexity of industrial networks necessitates a dual strategy of "technology + management" for security protection. By conducting regular attack and defense drills, fixing known vulnerabilities, and deploying hardware devices suitable for the scenario (such as the USR-G809s), enterprises can build a full-link security system covering "end-edge-pipe-cloud."