net.sniff - net.fuzz

A network packet sniffer and fuzzer module. Supports both BPF syntax and regular expressions for filtering.

It can also dissect major protocols to harvest credentials.

Commands

net.sniff on

Start the packet sniffer.

net.sniff off

Stop the packet sniffer.

net.sniff stats

Print sniffer session configuration and statistics.

net.fuzz on

Enable fuzzing for sniffed packets containing specified layers.

net.fuzz off

Disable fuzzing.

Parameters

Parameter	Default	Description
net.fuzz.layers	Payload	Comma separated types of layer to fuzz.
net.fuzz.rate	1.0	Rate in the [0.0,1.0] interval of packets to fuzz.
net.fuzz.ratio	0.4	Rate in the [0.0,1.0] interval of bytes to fuzz for each packet.
net.fuzz.silent	false	If true it will not report fuzzed packets.
net.sniff.filter	not arp	BPF filter for the sniffer.
net.sniff.interface		Interface to sniff on.
net.sniff.local	false	If true it will consider packets from/to this computer, otherwise it will skip them.
net.sniff.output		If set, the sniffer will write captured packets to this pcap file.
net.sniff.regexp		If set, only packets with a payload matching this regular expression will be considered.
net.sniff.source		If set, the sniffer will read from this pcap file instead of the current interface.
net.sniff.verbose	false	If true, every captured and parsed packet will be sent to the events.stream for displaying, otherwise only the ones parsed at the application layer (sni, http, etc).

Examples

The local-sniffer.cap caplet will sniff, parse and print all packets on the local machine:

events.clear

set net.sniff.verbose false
set net.sniff.local true
# uncomment to skip ARP and DNS requests
# set net.sniff.filter "not arp and not udp port 53"
net.sniff on

Change 90% of mDNS incoming packets by fuzzing 40% of their payload (will reinject fuzzed packets):

set net.sniff.verbose true
set net.fuzz.rate 0.9
set net.fuzz.ratio 0.4
set net.fuzz.silent false
set net.fuzz.layers Payload
set net.sniff.filter "host 224.0.0.251 and port 5353"
net.fuzz on

Change 100% of WiFi packets by fuzzing 70% of their Dot11InformationElement and Dot11Data layers:

set net.sniff.verbose true
set net.fuzz.rate 1.0
set net.fuzz.ratio 0.7
set net.fuzz.layers Dot11InformationElement, Dot11Data
net.fuzz on