Network Security


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Network Security

  1. 1. Good Afternoon All…
  2. 2. OVERVIEW What is SECURITY? Why do we need SECURITY? Who is VULNERABLE? Common Security Attacks and countermeasures…  Spoofing {IP Spoofing}  Sniffing  Hijacking {man-in-middle attacks}  Trojans  DoS/DDoS Attacks  Social Engineering
  3. 3. WHAT IS SECURITY? says -:  Freedom from RISK or DANGER is SECURITY RISK -: potential to create a LOSS is known as RISK… DANGER -: a source of RISK is DANGER If we correlate these two, it gives-: “ a source which has the potential to create a LOSS” Security is the criteria of minimizing the RISK and removing the DANGER.
  4. 4. NETWORK SECURITY Security management for NETWORKS is known as Network Security…What are NETWORKS???  network, is a collection of hardware components and computers interconnected by communication channels that allow sharing of resources and information… To secure our resources and information from illegal, unauthorized access, we need an efficient management for networks which is often known as NETWORK SECURITY…
  5. 5. NEED FOR NETWORK SECURITYTo ensure that -: information on a network remains SECURED information we passed should not be LOST the information should not be DELAYED hackers and crackers do not access your information
  7. 7. HACKERS VS. CRACKERS Hacker { white hats } are the programmers that break the NETWORK SECURITY for fruitful purposes like for identifying security holes, tracking suspicious CRACKER’s…whereas,,,,, Cracker { black hats } are the programmers that also break the NETWORK SECURITY but for evil purposes like stealing account details, login informations and infecting different NETWORK’s…
  8. 8. WHO IS VULNERABLE? Financial institutions and banks Internet service providers Pharmaceutical companies Government and defense agencies Contractors to various government agencies Multinational corporations Bottom line is-: “ANYONE ON THE NETWORK IS VULNEABLE”
  9. 9. COMMON SECURITY ATTACKS ANDCOUNTERMEASURES  Spoofing {IP Spoofing}  Sniffing  Hijacking {man-in-middle attacks}  Trojans  DoS/DDoS Attacks  Social Engineering
  10. 10. OVERVIEW OF IP SPOOFING First Attack-: 1980’s Done By-: Robert Morris Major Types-: Blind and Non-Blind Attacks Victim-: Unsecured and Static IP Addresses
  11. 11. IP SPOOFING Spoofing is the creation of TCP/IP packets using somebody elses IP address. Routers use the "destination IP" address in order to forward packets through the Internet, but ignore the "source IP" address. That address is only used by the destination machine when it responds back to the source. SSH > SECURE SHELL
  12. 12. SPOOFING COUNTERMEASURESThe countermeasure for spoofing is ingressfiltering. Routers that perform ingress filteringcheck the IP address of incoming packets. Ifthe source address is not in the validrange, then such packets will be discarded.
  13. 13. SNIFFING Packet sniffing is the interception of data packets traversing a network. A sniffer program works at the Ethernet layer in combination with network interface cards (NIC) to capture all traffic traveling to and from internet host site. There are dozens of freely available packet sniffer programs on the internet. The more sophisticated ones allow more active intrusion.
  14. 14. SNIFFING COUNTERMEASURESSniffing can be detected two ways: Host-based : Software commands exist that can be run on individual host machines to tell if the NIC is running in promiscuous mode. Network-based : Solutions tend to check for the presence of running processes and log files, which sniffer programs consume a lot of. However, sophisticated intruders almost always hide their tracks by disguising the process and cleaning up the log files.
  15. 15. OVERVIEW OF SESSION HIJACKING First Attack-: 2001 Major Victims-: Any one on the Network which has cookies enabled… Major Types-: Active and Passive Attacks It’s the most DANGEROUS and MALLICIOUS attack in today’s scenario of NETWORKING
  16. 16. SESSION HIJACKING {MAN-IN MIDDLE}COUNTERMEASURES This is a technique that takes advantage of a weakness in the TCP/IP protocol. Hijacking occurs when someone between you and the person with whom you are communicating is actively monitoring, capturing, and controlling your communication transparently. Next Page…
  17. 17. SESSION HIJACKING {MAN-IN MIDDLE} Man-in-middle attacks are like someone assuming your identity in order to read your message. The person on the other end might believe it is you, because the attacker might be actively replying as you, to keep the exchange going and gain more information.
  18. 18. SESSION HIJACKING{MAN-IN MIDDLE}COUNTERMEASURESCountermeasures to help prevent session hijackinginclude: Use encrypted session negotiation. Use encrypted communication channels. Stay informed of platform patches to fix TCP/IP vulnerabilities, such as predictable packet sequences.
  19. 19. OVERVIEW OF TROJAN’S First Trojan-: 1975, Pervading Animal Who Coded It-: John Walker Major Victims-: Banking, Business etc… Major Examples-: big wooden horse, JESUS etc… Have The Potential To Destroy Any System except UNIX one
  20. 20. TROJANS These are programs that look like ordinary software, but actually perform unintended or malicious actions behind the scenes when launched. Most remote control spyware programs are of this type. The number of Trojan techniques are only limited by the attackers imagination. A Torjanizes file will look, operate, and appear to be the same size as the compromised system file.
  21. 21. TROJANS COUNTERMEASURES The only protection is early use of a cryptographic checksum or binary digital signature procedure.
  22. 22. OVERVIEW OF DOS/DDOS ATTACKS First Attack-: 1974 in PLATO System Laboratory Who Done It-: A System Admin of PLATO Major Victims-: Yahoo! , Hotmail, Twitter etc… Most Devastating DoS Attack-: “Ping of DEATH” Have The Potential To Destroy Any Network EVEN TODAY
  23. 23. DOS/DDOS {DENIAL OF SERVICE} Denial of Service attack on a network is designed to bring the network to its knees by flooding it with useless traffic. Denial of Service can result when a system, such as a Web server, has been flooded with illegitimate requests, thus making it impossible to respond to real requests or task. Yahoo! and e-bay were both victims of such attacks in February 2000.
  24. 24. DOS/DDOS {DENIAL OF SERVICE}There are three basic typesof attack…. Consumption of computational resources, such as band width, disk space or CPU time. Disruption of configuration information, such as routing information. Disruption of physical network components.
  26. 26. SOCIAL ENGINEERINGSocial Engineering Involves… Faked Email : The social engineer sends a message to one or more users in a domain that "this is the system administrator and your password must be reset to user 123 " for a temporary period of time. The hacker then continuously monitors for the change and then exploits the whole system. Fictitious Competition : The social engineer manipulates a group of users to participate in some fake competition for a jackpot prize, with the ultimate purpose of eventually extracting confidential information about network and password security.
  27. 27. SOCIAL ENGINEERINGCOUNTERMEASURES There aren’t always solutions to all of these problems  Humans will continue to be tricked into giving out information they shouldn’t  Educating them may help a little here, but, depending on how bad you want the information, there are a lot of bad things you can do to get it. So, the best that can be done is to implement a wide variety of solutions and more closely monitor who has access to what network resources and information NOTE: But, this solution is still not perfect
  28. 28. CONCLUSION The Internet works only because we implicitly trust one another It is very easy to exploit this trust The same holds true for software Itis important to stay on top of the latest CERT security advisories to know how to patch any security holes
  29. 29. PRESENTED BY -: The Terminator {Pushkar} The Obedient {Nikhil} Mrs. Cheerful (Niyati) Mrs. Silence (Sonia) Mr. X {Puneet}