So today we will know about the open source tool that helps in active reconnaissance network security. This tool is very amazing, as you can tell -_- you can help us by subscribing to our youtube channel :. Kumar Atul Jaiswal .: before using the too.
The firewalk tool is an active reconnaissance network security tool that helps us to figure out what level 4 protocols will pass or deny in our router or firewall. It attempts to scan what protocols will allow and what it will block.
This tool is Really very useful during pentest to check firewalls in a corporate environment. firewalk active reconnaissance network security tool
How Does FIREWALK work
Firewalk
attempts to determine which protocols a router or firewall will block
and which they will pass on to downstream hosts. It operates on an IP
expiry technique, much like the commonly used Traceroute program.
The
IP expiry technique involves manipulating the time to live (TTL) field
of the IP header to map out all intermediate routers or hops between a
scanning host and the target host. In Firewalk, scans are then sent with
a TTL value one hop higher than that of the target host.
If
the scan packets are blocked by an ACL or firewall, they are dropped or
rejected. If allowed to pass through, they will expire and elicit an
ICMP time exceeded message.
Based upon the results of the scans, Firewalk can identify which ports are open.
Firewalk is not pre-installed in Kali Linux's newer versions but we don't need to to clone from github this tool available in Kali Linux repository so open terminal and type following command to update our Kali.
apt-get update
After updating complete we will need to install our this tutorials tool firewalk. This is also very easy. Type following command in terminal linux :
apt-get install firewalk -y
After installation process complete we are going to run this tool. We can use following command to run filewalk:
firewalk -S 1-23 -i usb0 192.168.42.1 192.168.42.43
I have tested this in my own system and the screenshot is this command is following :
In the above command -S is for specifying the port numbers we want to test and -i is for specifying the interface of network like wlan0 eth0 etc.
you can check which interface network do you use
ifconfig
To check other option of this tool run following command in terminal window.
firewalk -h
Script Arguments
firewalk.max-probed-ports
maximum number of ports to probe per protocol. Set to -1 to scan every filtered port.
firewalk.max-retries
the maximum number of allowed retransmissions.
firewalk.recv-timeout
the duration of the packets capture loop (in milliseconds).
firewalk.max-active-probes
maximum number of parallel active probes.
firewalk.probe-timeout
validity period of a probe (in milliseconds).
Example Usage
- nmap --script=firewalk --traceroute <host>
- nmap --script=firewalk --traceroute --script-args=firewalk.max-retries=1 <host>
- nmap --script=firewalk --traceroute --script-args=firewalk.probe-timeout=400ms <host>
- nmap --script=firewalk --traceroute --script-args=firewalk.max-probed-ports=7 <host>
Script Output
| firewalk:
| HOP HOST PROTOCOL BLOCKED PORTS
| 2 192.168.1.1 tcp 21-23,80
| udp 21-23,80
| 6 10.0.1.1 tcp 67-68
| 7 10.0.1.254 tcp 25
|_ udp 25
Disclaimer
This was written for educational purpose and pentest only.
The author will not be responsible for any damage ..!
The author of this tool is not responsible for any misuse of the information.
You will not misuse the information to gain unauthorized access.
This information shall only be used to expand knowledge and not for causing malicious or damaging attacks. Performing any hacks without written permission is illegal ..!
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