What is Sniffing? - Hacking kida - Hacking kida - Ethical hacking | Android | Linux

What is Sniffing? - Hacking kida

What is Sniffing

Sniffing
Sniffing

Sniffing is that the method of watching and capturing all the packets passing through a given network mistreatment sniffing tools. it's a variety of tapping phone wires and obtain to understand concerning the spoken language. it's additionally known as wiretapping applied to the pc networks.

Sniffing : There is most chance that if a collection of enterprise switch ports is open, then one among their staff will sniff the complete traffic of the network. Anyone within the same physical location will plug into the network mistreatment coaxial cable or connect wirelessly to it network and sniff the full traffic.

In different words, Sniffing permits you to check all styles of traffic, each protected and unprotected. within the right conditions and with the correct protocols in situ, Associate in Nursing offensive party is also able to gather info that may be used for additional attacks or to cause different problems for the network or system owner.

What is sniffing?

One will sniff the subsequent sensitive info from a network −
  • Email traffic
  • FTP passwords
  • Web traffics
  • Telnet passwords
  • Router configuration
  • Chat sessions
  • DNS traffic

How it works?

Sniffing : A person ordinarily turns the NIC of the system to the promiscuous mode so it listens to all or any the information transmitted on its section.

Promiscuous mode refers to the distinctive method of local area network hardware, specifically, network interface cards (NICs), that permits Associate in Nursing NIC to receive all traffic on the network, although it's not addressed  to the current NIC. By default, a NIC ignores all traffic that's not addressed  to that, that is finished by examination the destination address of the local area network packet with the hardware address (a.k.a. MAC) of the device. whereas this makes excellent sense for networking, non-promiscuous mode makes it tough to use network watching and analysis software package for diagnosis property problems or traffic accounting.

A person will incessantly monitor all the traffic to a pc through the NIC by coding knowledge} encapsulated within the data packets.

Types of Sniffing

Sniffing is either Active or Passive in nature.

Passive Sniffing

In passive sniffing, the traffic is secured however it's not altered in any method. Passive sniffing permits listening solely. It works with Hub devices. On a hub device, the traffic is shipped to all or any the ports. during a network that uses hubs to attach systems, all hosts on the network will see the traffic. Therefore, Associate in Nursing aggressor will simply capture traffic browsing.

The good news is that hubs are virtually obsolete today. most recent networks use switches. Hence, passive sniffing isn't any simpler.

Active Sniffing

In active sniffing, the traffic isn't solely secured and monitored, however it should even be altered in a way as determined by the attack. Active sniffing is employed to smell a switch-based network. It involves injecting address resolution packets (ARP) into a target network to flood on the switch content available memory (CAM) table. CAM keeps track of that host is connected to that port.

Following are the Active Sniffing Techniques −

  • MAC Flooding
  • DHCP Attacks
  • DNS Poisoning
  • Spoofing Attacks
  • ARP Poisoning

Protocols that are affected

Protocols like the tried and true TCP/IP were ne'er designed with security in mind and thus don't provide a lot of resistance to potential intruders. many rules lend themselves to simple sniffing −

  • HTTP − it's wont to send info within the clear text with none encoding and so a true target.
  • SMTP (Simple Mail Transfer Protocol) − SMTP is essentially used within the transfer of emails. This protocol is economical, however it doesn't embrace any protection against sniffing.
  • NNTP (Network News Transfer Protocol)− it's used for every kind of communications, however its main disadvantage is that knowledge and even passwords are sent over the network as clear text.
  • POP (Post workplace Protocol) − POP is strictly wont to receive emails from the servers. This protocol doesn't embrace protection against sniffing as a result of it is unfree.
  • FTP (File Transfer Protocol) − FTP is employed to send and receive files, however it doesn't provide any security measures. All the information is shipped as clear text that may be simply sniffed.
  • IMAP (Internet Message Access Protocol) − IMAP is same as SMTP in its functions, however it's extremely at risk of sniffing.
  • Telnet − Telnet sends everything (usernames, passwords, keystrokes) over the network as clear text and therefore, it is simply sniffed.
Sniffers aren't the dumb utilities that permit you to look at solely live traffic. If you actually need to research every packet, save the capture and review it whenever time permits.

Hardware Protocol Analysers

Before we tend to move into additional details of sniffers, it's vital that we tend to discuss concerning hardware protocol analysers. These devices plug into the network at the hardware level and might monitor traffic while not manipulating it.

Hardware protocol analysers are wont to monitor and determine malicious network traffic generated by hacking software package put in within the system.

They capture a knowledge packet, decode it, and analyse its content in step with sure rules.

Hardware protocol analysers permit attackers to check individual knowledge bytes of every packet passing through the cable.

These hardware devices aren't without delay out there to most moral hackers thanks to their huge price in several cases.

Lawful Interception

Lawful Interception (LI) is outlined as de jure sanctioned access to communications network knowledge like phone calls or email messages. LI should be in pursuance of a lawful authority for the aim of study or proof. Therefore, LI could be a security method during which a network operator or service supplier provides enforcement officers permission to access personal communications of people or organizations.

Almost all countries have written and enacted legislation to manage lawful interception procedures; standardization teams are making LI technology specifications. Usually, LI activities are taken for the aim of infrastructure protection and cyber security.

However, operators of personal network infrastructures will maintain LI capabilities inside their own networks as Associate in Nursing inherent right, unless otherwise prohibited.

LI was rest referred to as wiretapping and has existed since the beginning of electronic communications.

Conclusion:
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