Tuesday, January 4, 2011

ARP poisoning with dsniff

dsniff is a collection of tools for network auditing and penetration testing. dsniff, filesnarf, mailsnarf, msgsnarf, urlsnarf, and webspy passively monitor a network for interesting data (passwords, e-mail, files, etc.). arpspoof, dnsspoof, and macof facilitate the interception of network traffic normally unavailable to an attacker (e.g, due to layer-2 switching). sshmitm and webmitm implement active monkey-in-the-middle attacks against redirected SSH and HTTPS sessions by exploiting weak bindings in ad-hoc PKI.

To install dsniff on MAC OS X - with MacPorts.

$ sudo port install dsniff

Now you need to find out two things,

1. IP address of the target machine - say
2. IP address of the Gateway - say

Let's start ARP poisoning from the attacker's machine - with arpspoof tool which comes with dsniff.

$ sudo arpspoof -i en1 -t

This will update target machine's ARP table with attacker's MAC address against the IP address of the gateway.

Now - start a tcpdump on the same interface from your machine - start viewing all the traffic going to and from the target machine.

$ sudo tcpdump -i en1


Phenomeno said...

Hi! Did you install dsniff-devel? because there is a conflict between libnet and libnetx11.


Prabath said...

What is the version of Mac OS X you are using ? Yes.. sniff-devel is installed...

Thanks - Prabath

Phenomeno said...

Thanks, I'm using OS X 10.6.6.

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