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Packet Sniffers

Packet Sniffers. Prepared By: Amer Alhorini Supervised By: Dr. Lo'ai Tawalbeh NYIT New York Institute of Technology. The Network Today. Packet Sniffers. Host A. Host B. Router A . Router B .

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Packet Sniffers

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  1. Packet Sniffers Prepared By: Amer Alhorini Supervised By: Dr. Lo'ai Tawalbeh NYIT New York Institute of Technology

  2. The Network Today

  3. Packet Sniffers Host A Host B Router A Router B • A packet sniffer is a software application that uses a network adapter card in promiscuous mode to capture all network packets. The following are the packet sniffer features: • Packet sniffers exploit information passed in clear text. Protocols that pass information in the clear include the following: • Telnet • FTP • SNMP • POP • Packet sniffers must be on the same collision domain.

  4. Packet Sniffer Mitigation • The following techniques and tools can be used to mitigate sniffers: • Authentication—Using strong authentication, such as one-time passwords, is a first option for defense against packet sniffers. • Switched infrastructure—Deploy a switched infrastructure to counter the use of packet sniffers in your environment. • Antisniffer tools—Use these tools to employ software and hardware designed to detect the use of sniffers on a network. • Cryptography—The most effective method for countering packet sniffers does not prevent or detect packet sniffers, but rather renders them irrelevant. Host A Host B Router A Router B

  5. Trends that Affect Security • Increase of network attacks • Increased sophistication of attacks • Increased dependence on the network • Lack of trained personnel • Lack of awareness • Lack of security policies • Wireless access • Legislation • Litigation

  6. Internet Network Threats Attack Examples • There are four general categories of security threats to the network: • Unstructured threats • Structured threats • External threats • Internal threats Internal exploitation Dial-in exploitation External exploitation Compromised host

  7. Four Classes of Network Attacks • Reconnaissance attacks • Access attacks • Denial of service attacks • Worms, viruses, and Trojan horses

  8. Specific Attack Types • All of the following can be used to compromise your system: • Packet sniffers • IP weaknesses • Password attacks • DoS or DDoS • Man-in-the-middle attacks • Application layer attacks • Trust exploitation • Port redirection • Virus • Trojan horse • Operator error • Worms

  9. Reconnaissance Attack Example • Sample IP address query Sample domain name query

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