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OV 4 - 1 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening Internetwork Devices and Services  Harden Internetwork Connection Devices.

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Presentation on theme: "OV 4 - 1 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening Internetwork Devices and Services  Harden Internetwork Connection Devices."— Presentation transcript:

1 OV 4 - 1 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening Internetwork Devices and Services  Harden Internetwork Connection Devices  Harden DNS and BIND Servers  Harden Web Servers  Harden File Transfer Protocol (FTP) Servers  Harden Network News Transfer Protocol (NNTP) Servers  Harden Email Servers  Harden Conferencing and Messaging Servers

2 OV 4 - 2 Copyright © 2005 Element K Content LLC. All rights reserved. Internetwork Devices SwitchesRoutersFirewalls

3 OV 4 - 3 Copyright © 2005 Element K Content LLC. All rights reserved. Unnecessary Network Protocols  Transport protocols  NetBEUI  NWLink  AppleTalk  Service protocols  NNTP  FTP  Others

4 OV 4 - 4 Copyright © 2005 Element K Content LLC. All rights reserved. Firmware Updates

5 OV 4 - 5 Copyright © 2005 Element K Content LLC. All rights reserved. Internetwork Device Vulnerabilities  SNMP  Telnet  Router configuration  Finger  Small server  IP filter  Default ports  IP source routing  ICMP redirect  RIP v1

6 OV 4 - 6 Copyright © 2005 Element K Content LLC. All rights reserved. A DMZ DMZ Web server

7 OV 4 - 7 Copyright © 2005 Element K Content LLC. All rights reserved. An Intranet Employee handbook

8 OV 4 - 8 Copyright © 2005 Element K Content LLC. All rights reserved. An Extranet Company A Company C Company B

9 OV 4 - 9 Copyright © 2005 Element K Content LLC. All rights reserved. A VLAN Point-to-point connection Point-to-point connection Point-to-point connection Point-to-point connection VLAN switch

10 OV 4 - 10 Copyright © 2005 Element K Content LLC. All rights reserved. NAT 192.168.12.100 NAT Server 192.168.12.20 192.168.12.30 24.96.83.120

11 OV 4 - 11 Copyright © 2005 Element K Content LLC. All rights reserved. Network Media Types Coax Twisted pair Fiber-optic

12 OV 4 - 12 Copyright © 2005 Element K Content LLC. All rights reserved. Network Media Vulnerabilities  Coax vulnerabilities  Twisted-pair vulnerabilities  Fiber-optic vulnerabilities  General vulnerabilities

13 OV 4 - 13 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening Internetwork Devices  Protect the devices while maintaining connectivity  Follow hardening guidelines  Requirements will vary

14 OV 4 - 14 Copyright © 2005 Element K Content LLC. All rights reserved. DNS everythingforcoffee.com www.everythingforcoffee.com 192.168.1.2 www.everythingforcoffee.com 192.168.1.2.com.org

15 OV 4 - 15 Copyright © 2005 Element K Content LLC. All rights reserved. DNS and BIND Vulnerabilities  Spoofing  Hijacking  Cache corruption  Input validation  Environment variables  Zone transfers  Rogue client registrations

16 OV 4 - 16 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening DNS and BIND  Protect the zone information while maintaining service availability  Follow hardening guidelines  Requirements will vary

17 OV 4 - 17 Copyright © 2005 Element K Content LLC. All rights reserved. HTTP Web client Web server

18 OV 4 - 18 Copyright © 2005 Element K Content LLC. All rights reserved. Web Server Authentication Web client Web server

19 OV 4 - 19 Copyright © 2005 Element K Content LLC. All rights reserved. Web Server Authentication Methods  Address-based  Anonymous  Basic  Digest  Integrated  Certificates

20 OV 4 - 20 Copyright © 2005 Element K Content LLC. All rights reserved. Web Server Vulnerabilities  Format string  Improper input validation  CGI scripts  Code outside web root  Web server applications  Weak authentication  Clear text transmissions  HTML source code  Buffer overflows

21 OV 4 - 21 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening Web Servers  Protect data and server while maintaining website access  Follow hardening guidelines  Requirements will vary

22 OV 4 - 22 Copyright © 2005 Element K Content LLC. All rights reserved. FTP FTP client

23 OV 4 - 23 Copyright © 2005 Element K Content LLC. All rights reserved. FTP Vulnerabilities  Basic authentication  Anonymous and blind FTP  Unnecessary services  Clear text transmissions  Firewall configuration  “Glob”  “Bounce”  File sharing exploitation

24 OV 4 - 24 Copyright © 2005 Element K Content LLC. All rights reserved. SSH Password Password is encrypted Session is secured 011001 slogin

25 OV 4 - 25 Copyright © 2005 Element K Content LLC. All rights reserved. SFTP SSH encryption FTP client

26 OV 4 - 26 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening FTP Servers  Protect the server and data while maintaining service  Follow hardening guidelines  Requirements will vary

27 OV 4 - 27 Copyright © 2005 Element K Content LLC. All rights reserved. NNTP Subscriber

28 OV 4 - 28 Copyright © 2005 Element K Content LLC. All rights reserved. NNTP Vulnerabilities NNTP  Anonymous access  Password privacy  Data privacy  Email integration

29 OV 4 - 29 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening an NNTP Server  Prevent unauthorized postings and data loss while maintaining service  Follow hardening guidelines  Requirements will vary NNTP

30 OV 4 - 30 Copyright © 2005 Element K Content LLC. All rights reserved. SMTP Email clientEmail server

31 OV 4 - 31 Copyright © 2005 Element K Content LLC. All rights reserved. Email Vulnerabilities  Email worms  Malicious code  8.3 file names  Data buffers  Spam  Hoaxes  SMTP relays

32 OV 4 - 32 Copyright © 2005 Element K Content LLC. All rights reserved. PGP  Public email security  Encrypt message contents and encrypt key  Digital signing

33 OV 4 - 33 Copyright © 2005 Element K Content LLC. All rights reserved. S/MIME  Security for email attachments  Various attachment file formats  Encryption and digital signing

34 OV 4 - 34 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening Email Servers  Protect server and mail data while supporting email users  Follow hardening guidelines  Requirements will vary

35 OV 4 - 35 Copyright © 2005 Element K Content LLC. All rights reserved. Conferencing and Messaging Vulnerabilities  Sniffing  Eavesdropping  Privacy  Social engineering

36 OV 4 - 36 Copyright © 2005 Element K Content LLC. All rights reserved. Hardening Conferencing and Messaging Servers  Protect server and data, prevent spoofing, maintain service availability  Follow hardening guidelines  Requirements will vary

37 OV 4 - 37 Copyright © 2005 Element K Content LLC. All rights reserved. Reflective Questions 1.Which internetwork connection device do you think is most important to secure? 2.Which provides a greater security threat to your organization: your border router or your email infrastructure?

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