Outline (Network Security Challenge)

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1

2 Outline (Network Security Challenge) Security Device Selection Internet Sharing Solution Service Publishing 2

3 Security Device Selection

4 Firewall

5 Firewall firewall: An introduction to firewalls A firewall is a hardware or software system that prevents unauthorized access to or from a network

6 Firewall Firewall Type First generation Packet Filtering Layer 3 Firewall Source / Destination IP address Source / Destination port Protocol Access Control Lists (ACL) PACL / RACL / VACL

7 Firewall Firewall Type: Packet Filtering Disadvantage Packet-filtering firewalls do not have visibility into the payload. Not Monitor Session Initiation

8 Firewall Firewall Type Second generation Circuit level Gateway Session layer Model OSI, TCP Specific Monitor TCP handshaking between packets (SYN,SYN-ACK,ACK)

9 Firewall Firewall Type: Circuit level Gateway Disadvantage Packet-filtering firewalls do not have visibility into the payload.

10 Firewall Firewall Type Application level Gateway (ALG) Web Application Firewall (WAF) Third generation Layer 7, Application Request (Good or Bad) Deep packet inspection (DPI)

11 Firewall Firewall Type Stateful Multilayer Inspection (SMLI): Stateful packet inspection (SPI) Aspects of the other three types of firewalls.

12 Firewall Firewall Type Stateless firewalls: Packet filters Vulnerable to spoofing attacks Stateful firewalls: keeps track of the state of network connections able to hold significant attributes of each connection in memory

13 Stateful Packet Inspection Stateful is limited Sourceinspection Version Service that can Total Length UDP Port only ID block Flags on ports Fragment TTL Protocol IP Checksum Destination UDP Port Source IP Address Destination IP Address IP Options No Data Inspection! INSPECT Source Source Port Sequence Syn state SYN Destination Dest Port 80 Sequence 2821 IP Option none Stateful Packet Inspection Firewall Traffic Path

14 Deep Packet Inspection Source UDP Port Destination UDP Port Signature Database ATTACK-RESPONSES 14BACKDOOR 58BAD-TRAFFIC 15DDOS 33DNS 19DOS 18EXPLOIT >35FINGER Version 13FTP 50ICMP Service 115Instant Total Length Messenger 25IMAP 16INFO 7Miscellaneous44MS-SQL ID Flags Fragment 24MS- SQL/SMB 19MULTIMEDIA 6MYSQL TTL 2NETBIOS Protocol 25NNTP 2ORACLE IP Checksum 25P2P 51POLICY 21POP2 4POP3 18RPC 124RSERVICES 13SCAN 25SMTP 23SNMP 17TELNET 14TFTP 9VIRUS 3WEB-ATTACKS 47WEB-CGI 312WEB-CLIENT Source IP Address Destination IP Address IP Options INSPECT INSPECT Stateful Packet Inspection Deep Packet Inspection Deep Packet Inspection inspects all traffic moving through a device Firewall Traffic Path

15 Deep Packet Inspection with Intrusion Prevention Signature Database ATTACK-RESPONSES 14BACKDOOR 58BAD-TRAFFIC 15DDOS 33DNS 19DOS 18EXPLOIT >35FINGER Version Service Total Length ID Flags Fragment TTL Protocol IP Checksum Source IP Address Destination IP Address Version 13FTP 50ICMP Service 115Instant Total Length Version Service Total Length ID Messenger Flags Fragment 25IMAP 16INFO Source TTL Protocol IP Checksum UDP Source Source IP Address Destination 7Miscellaneous44MS-SQL IP Address UDP Port ID Length Flags Fragment 24MS- UDP Port ATA SQL/SMB 19MULTIMEDIA 6MYSQL Version Service Total Length 2NETBIOS Protocol 25NNTP 2ORACLE IP Checksum ID Flags Fragment TTL Protocol IP Checksum Source IP Address Destination 25P2P IP Address 51POLICY 21POP2 4POP3 Destination 18RPC Source 124RSERVICES UDP IP Address 13SCAN Destination UDP Port 25SMTP 23SNMP 17TELNET Destination Checksum IP Address UDP Port 14TFTP 9VIRUS 3WEB-ATTACKS 47WEB-CGI 312WEB-CLIENT IP Options Version Service Total Length ID Flags Fragment TTL Protocol IP Checksum Source IP Address Destination IP Address IP Options Comparing Application Attack, Worm or Trojan Found! Stateful Packet Inspection Deep Packet Inspection Deep Packet Inspection with Intrusion Prevention can find and block, application vulnerabilities, worms or Trojans. Firewall Traffic Path

16 UTM 16

17 UTM Integrated security solutions: UTM (Unified Threat Management) USM (Unified Security Management ) Multiple security functions: network firewalling, network intrusion prevention, antivirus (AV) anti-spam, VPN, content filtering, load balancing, data loss prevention and

18 UTM Key advantages Reduced complexity Simplicity Easy Management: Plug & Play Architecture, Web-based GUI for easy management Key Disadvantages Single point of failure for network traffic, unless HA is used Single point of compromise if the UTM has vulnerabilities Potential impact on latency and bandwidth when the UTM cannot keep up with the traffic

19 UTM vs NGFW NGFW (Next-Generation Firewall) UTM vs NGFW: UTMs typically have a lower throughput rating and are marketed to small and medium-sized businesses. The term NGFW was coined by vendors working with Gartner to create a class of products capable of fitting into an enterprise network that contained all of the features of a UTM

20 Security Device Selection Factor Designed Notice: Requirement Bandwidth / Increase / Client # / Server # / Type Of Services / Network Architecture Core, Edge Technical Support Documentary Licensing Price

21 Gartner Magic Quadrant - Firewall Leaders Challengers Visionary Nich Players

22 Gartner Magic Quadrant - UTM Leaders Challengers Visionary Nich Players

23 Internet Sharing

24 Internet Sharing Network Isolation (Internet & Intranet) Classified information and Organization False Sense of security Laches of Providing Security Lack of Attention Internal Threat Deficiency Function of External Threat Too many Common points

25 Internet Sharing Internet Sharing Solution: Security VPN Proxy Hotspot NAT Virtualization (VDI, V-App) Cloud (Public, Private) Thin Client (Zero Client) Hardware Isolation (HDD)

26 Internet Sharing Internet Sharing Solution: Manageability and Monitoring Authentication ØWho? Authorization ØWhat can the user do? Accounting ØWhat did the user do?

27 Proxy

28 Proxy proxy is a server (a computer system or an application) that acts as an intermediary for requests from clients seeking resources from other servers. Monitoring,filtering and Security(Firewall), Caching, Bypassing filters Types of proxy Open proxies: anonymity, Daisy chaining Forward proxies: Internet Sharing Reverse proxies: Load balancing, authentication

29 Forward proxies Internet Sharing Monitoring Security Content Filtering

30 Reverse Proxies Load balancing, authentication Web Publishing, Application Firewall

31 Implementations of proxies Web proxy : HTTP, HTTPs,ftp Transparent proxy SOCKS proxy: a SOCKS server proxies TCP connections to an arbitrary IP address, and provides a means for UDP packets to be forwarded. CGI proxy: (Common Gateway Interface) proxy appears to a user as a web page that allows the user to access a different site through it, in most cases anonymously. DNS proxy

32 NAT

33 NAT NAT (Network Address Translation) IPv4 of Limitation Security Level

34 NAT NAT (Network Address Translation) Type Of NAT Static NAT: one-to-one NAT Dynamic NAT: Pool IP Address, Port Address Translation (PAT) Classification Of NAT: Destination network address translation (DNAT):publish a service, port forwarding, DMZ Source network address translation (SNAT): connection tracking and filtering,internet Sharing Masquerade: Type of SNAT, one-to-many

35 NAT DNAT Destination network address translation (DNAT):publish a service, port forwarding, DMZ

36 NAT SNAT Source network address translation (SNAT): connection tracking and filtering,internet Sharing Masquerade: Type of SNAT, one-to-many

37 NAT Advantage and Disadvantage Advantages of NAT: provide an additional layer of security by making the original source and destination addresses hidden. provides increased flexibility when connecting to the public Internet. Disadvantages of NAT: a processor and memory resource consuming technology, for all incoming and outgoing may cause delay in IPv4 communication cause loss of end-device to end-device IP traceability Some technologies and network applications will not function

38 Service Publishing 38

39 DMZ 39

40 DMZ MZ (Militarized Zone) Private network Zone Include Servers and DB. DMZ (De-Militarized Zone) is a physical or logical sub-network that separates an internal local area network (LAN) from other untrusted networks. Web Server, Server, FTP,

41 DMZ DMZ Architecture: Single Firewall Dual Firewall Front-end Back-end Bastion Host

42 VPN 42

43 VPN Virtual Private Network (VPN) extends a private network across a public network, such as the Internet. It enables users to send and receive data across shared or public networks. VPN Type: Remote Access (Teleworking) Site to Site

44 VPN VPN systems may be classified by: The protocols used to tunnel the traffic Whether they offer site-to-site or network-to-network connectivity The levels of security provided (Encrypted or Unencrypted) Network Layer, such as Layer 2 or Layer 3 or Layer 7

45 VPN Tunneling Protocols: PPTP (Point-to-Point Tunneling Protocol) PPP (Point-to-Point Protocol) PPPOE (Point-to-Point Protocol over Ethernet) PPPOA (Point-to-Point Protocol over ATM) L2TP (Layer 2 Tunneling Protocol) L2F (Layer 2 Forwarding) IPSec (Internet Protocol Security) SSTP (Secure Socket Tunneling Protocol) GRE (Generic Routing Encapsulation) OpenVPN

46 IPSec IP or Internet Protocol in Layer 3 OSI Model Is a protocol suite for secure Internet Protocol The IPsec suite is an open standard IPSec Protocol Type IPSec Operation

47 IPSec IP Security Protocol : Authentication Header (AH) (Header) Encapsulating Security Payloads (ESP) (Header + Payload) Modes of operation Transport mode Tunnel mode

48 IPSec NAT + IPSec IPSec + NAT

49 Conclusion Defense in Depth: (also known as Castle Approach) is an information assurance (IA) concept in which multiple layers of security controls (defense) are placed throughout an information technology (IT) system

50 Security is Puzzle 50

51 Questions? Thanks for your Attention

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