Computer Security

In: Computers and Technology

Submitted By arai36
Words 266
Pages 2

What is Sniffing?

* Sniffing is a technique for gaining access through Network-Based attack. * A sniffer is a program that gathers traffic from the local network, and is useful for attackers looking to swipe data as well as network administrator trying to troubleshoot problems. * Using sniffer, an attacker can read data passing by a given machine in real time or store the data.

What does one sniff?

A sniffer can grab anything sent across the LAN, Including

* User IDs and passwords * Web Pages being visited * Email messages * Files shared using the Network File System * Chat sessions * DNS queries

Types of Sniffing

* Passive Sniffing
Sniffing performed on a hub is known as passive sniffing.

* Active Sniffing
When sniffing is performed on a switched network, it is known as active sniffing.

Dsniff (Sniffer tool)

* Dsniff is a set of password sniffing and network traffic analysis tools

* Big advantage of Dsniff is the amazing number of protocols that it interpret.Eg Telnet,Ftp,Http

* Nearly every sniffer can dump raw bits grabbed off the network. However, these raw bits are pretty much useless, unless the attacker can interpret what they mean.

Foiling Switches with floods

* Initiated via Dsniffs Macof program

* It works by sending out a flood of traffic with random MAC address on the LAN.

* As the number of different MAC addresses in use on the network increases, the switch dutifully stores the MAC addresses used by each link on the switch.

* When switch’s memory becomes exhausted, the switch will start forwarding data to all links on the switch

* At this point, Dsniff can capture desired…...

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