Network Eavesdropping

Revision as of 19:23, 30 May 2009 by Deleted user (Talk | contribs)

Jump to: navigation, search

[ product to get scratches of of auto glass ] [ atlanta georgia auto accident lawyer ] links [ walrasian economy ] [ autopia car care forum ] [ american asian festival film jose san ] [ automatic tank drain for compressed air ] [ autometers alliance ] page antique asia print domain [ 2 4890508.stm africa go hi rss ] [ automotive coolant types ] [ panda antivirus titanium 2004 keygen ] [ tenis australia open ] [ autogenerated ] [ african lion safari hamilton ] [ asian chicago single ] [ norton antivirus 2005 serial keys ] [ cork flooring australia ] guard antivirus [ grand theft auto 3 pc download ] [ symantec antivirus corporate edition 9 reviews ] url [ south africa for kids ] [ marriage act australia ] [ auto dealer florida here orlando pay ] mature asian photos [ roof ventilation australia ] http [ australian consolate ] [ ski resort jobs australia ] [ automotive engine oil pressure transducer operation ] [ mcafee antivirus 2005 download ] [ south african language dictionary ] [ african orchids impatients ] pan african film festiva [ diseases in africa ] beautiful asian faces [ types of antivirus software ] [ makro wholesalers south africa ] [ winantivirus pro 2005 deluxe ] [ jc autobody houston ] [ antivirus avg7.0 ] [ swaziland africa map ] [ liver foundation australia ] [ african leopards ] [ africa city south sun things ] [ cystic hyperplasia in dogs ]

This is an Attack. To view all attacks, please see the Attack Category page.

Last revision (mm/dd/yy): 05/30/2009


Network Eavesdropping or network sniffing is a network layer attack consisting of capturing packets from the network transmitted by others' computers and reading the data content in search of sensitive information like passwords, session tokens, or any kind of confidential information.

The attack could be done using tools called network sniffers. These tools collect packets on the network and, depending on the quality of the tool, analyze the collected data like protocol decoders or stream reassembling.

Depending on the network context, for the sniffing to be the effective, some conditions must be met:

• LAN environment with HUBs

This is the ideal case because the hub is a network repeater that duplicates every network frame received to all ports, so the attack is very simple to implement because no other condition must be met.

• LAN environment with switches

To be effective for eavesdropping, a preliminary condition must be met. Because a switch by default only transmits a frame to the port, a mechanism that will duplicate or will redirect the network packets to an evil system is necessary. For example, to duplicate traffic from one port to another port, a special configuration on the switch is necessary. To redirect the traffic from one port to another, there must be a preliminary exploitation like the arp spoof attack. In this attack, the evil system acts like a router between the victim’s communication, making it possible to sniff the exchanged packets.

• WAN environment

In this case, to make a network sniff it's necessary that the evil system becomes a router between the client server communications. One way to implement this exploit is with a DNS spoof attack to the client system.

Network Eavesdropping is a passive attack which is very difficult to discover. It could be identified by the effect of the preliminary condition or, in some cases, by inducing the evil system to respond a fake request directed to the evil system IP but with the MAC address of a different system.

Risk Factors



When a network device called a HUB is used on the Local Area Network topology, the Network Eavesdropping become easier because the device repeats all traffic received on one port to all other ports. Using a protocol analyzer, the attacker can capture all traffic on the LAN discovering sensitive information.


Figure 1. Local Eavesdropping attack.

Related Threat Agents

  • TBD

Related Attacks

Related Vulnerabilities

Related Controls