Building Secure Networks for the Industrial World

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1 Building Secure Networks for the Industrial World Anders Felling Vice President, International Sales Westermo Group Managing Director Westermo Data Communication AB 1

2 Westermo What do we do? Robust data communication devices for harsh environments We supply products that: provide the communication infrastructure for control and monitoring systems are used in mission critical systems, where commercial grade products are not sufficiently resilient are derived from proven commercial communication technology The built in safety, reliability and redundancy is a high value for customers 2

3 Westermo Group 2010 Founded in 1975 Turnover: 33 MEur Uninterrupted growth since 1994 No. of employees: % R&D spend Extensive IPR portfolio for key technologies Production units Sales and support units in 10 countries, distributors in another 36 Member of the Beijer Electronics Group 3

4 Westermo Group Westermo Head Office Sweden Stora Sundby Westermo Branch Offices Sweden Västerås United Kingdom Southampton United States Chicago Taiwan Taipei + 36 Distributors Worldwide Germany Waghäusel France Paris Austria Wien Switzerland Leimbach Singapore Singapore Belgium Chievres 4

5 Critical Infrastructure Projects 5

6 Cyber Security and Physical Security 6

7 Security Awareness - Physical and Cyber Physical & cyber security is now a key issue The threat of terrorist attacks is real CCTV, intruder and chemical detectors are now part of every system Cyber attacks are an increasing problem One UK utility reported that they are dealing with 8000 attacks a day! There is now a worm virus actively seeking and attacking PLC s Most serious attacks or infections are from within i.e. the employees 7

8 Security Issues and how these can be Addressed Creating secure connections over insecure networks like the Internet Security issues and vulnerabilities need to be addressed from the start It is too late once a vulnerability has been exposed and the system compromised How can we address these vulnerabilities using; Firewall VLAN s DMZ VPN s 8

9 Firewall 9

10 Firewall Effective means of stopping unwanted intrusions from insecure networks Block unauthorised traffic from the remote site Block IP ports Prevent unauthorised access to the management of the router Prevent the router from replying to probing traffic (ping, port scanning) 10

11 Firewalls in Industrial networks xxx VLAN 3 VLAN 1 VLAN 4 Connection from corporate LAN xxx VLAN xxx VLAN 5 This would normally require 5 discrete Firewalls xxx 11

12 VLANs - (Virtual LANs) 12

13 How Would You Use VLANs? Automation network VLAN ID 100 Corporate network VLAN ID 200 Security network VLAN ID

14 DMZ - (Demilitarized Zone) 14

15 DMZ (Demilitarized Zone) The DMZ acts a buffer between the trusted and un-trusted zones The DMZ prevents direct communication between the trusted and un-trusted zones. All communications from the un-trusted zone are terminated on an intermediate server or historian The DMZ can offer protection against cyber attacks such as the STUXNET worm or many of the other malicious worms and viruses present in cyberspace The servers in the DMZ still need to run strong, regularly updated antivirus software 15

16 DMZ SCADA Server Citrix Server Un-Trusted Typically incoming traffic will be HTTP, HTTPS from untrusted network Trusted Communications to trusted network will typically be industrial protocols i.e. Ether IP Profinet, CC Net, Modbus TCP X 16

17 VPNs - Virtual Private Networks 17

18 VPNs IPsec VPNs are key in allowing industrial networks on different sites to communicate VPNs are, in effect, tunnels linking the sites (leased lines) All connections need to be authenticated before accepted All data passing through the tunnel is encrypted IPsec VPN via untrusted Network Corporate network Internet MPLS Network WAN 18

19 Cyber Security Policy No matter how powerful the firewall, you also need good policies Large corporate or telemetry systems should look at IDS (Intrusion Detection Software) SCADA machines need regularly updated antivirus software Any machines likely to be connected to the industrial LAN should also have antivirus software Use a strong password policy, never words that can be looked up in a dictionary Servers should be located on trusted networks Pour glue in the USB ports so they can never be used! Have a recovery policy should system become infected or compromised 19

20 Physical Security through - Robustness - Redundancy - Monitoring - Compatibility 20

21 Robust products = Secure products Galvanic isolation - Galvanic isolation of the interfaces Transient suppression - Handles interference from high power cables, reactive loads and transients. Power supply - DC-supplied units, redundant power supply Mechanical performance - Handles high mechanical strain, DIN-mounted Extended temperature range - 40º to +70ºC Classifications and Approvals - EMC, Rail, Isolation, Vibration, Shock, MTBF, DNV, ATEX 21

22 Redundancy Secure connectivity through redundancy FRNT RSTP/STP OSPF and VRRP 22

23 FRNT Fast Recovery of Network Topology L2 Ring Redundancy FRNT is able to reconfigure redundant ring network consisting of up to 200 switches within 20ms of the initial failure, regardless of network load Focal Point Ports in blocking mode Member Media failure message Member X Member Media failure message Re-learn MAC tables message Member Member 23

24 RSTP Rapid Spanning Tree Protocol RSTP builds loop free topologies by creating a logical tree of the connected nodes in the network. This means that some ports needs to be set in a blocking state depending on how the nodes are connected together. X 24

25 OSPF and VRRP Layer 3 redundancy with OSPF and VRRP OSPF keeps track of the active routers and calculates best path to the connected networks VRRP creates redundant Default Gateways for the connected nodes on the LAN network. Layer 2 Network Layer 3 Backbone Layer 2 Network Layer 2 Network 25

26 Monitoring Alarm handling and remote monitoring through SNMP Syslog Configurable alarms Link alarm FRNT link alarm Power supply alarm Temperature alarm Digital In alarm Digital I/O that can be used for intrusion detection Connect the I/O contact to the cabinet door and receive an SNMP trap or Syslog message to the central monitoring system if someone opens the door. 26

27 Questions 27

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