Naabu: A Fast Port Scanner written in Go

A fast port scanner written in go with a focus on reliability and simplicity. Designed to be used in combination with other tools for attack surface discovery in bug bounties and pentests.

Naabu is a port scanning tool written in Go that allows you to enumerate valid ports for hosts in a fast and reliable manner. It is a really simple tool that does fast SYN/CONNECT scans on the host/list of hosts and lists all ports that return a reply.

Features

• Fast And Simple SYN/CONNECT probe based scanning.
• Optimized for ease of use and lightweight on resources
• Automatic handling of duplicate hosts between multiple subdomains
• NMAP Integration for service discovery
• Piped input / output support for integrating in workflows
• Multiple Output formats supported (JSON, File, Stdout)
• Multiple input support including HOST/IP/CIDR notation.

Usage

naabu -h

This will display help for the tool. Here are all the switches it supports.

Usage of ./naabu:
  -c int
      General internal worker threads (default 25)
  -config string
      Config file
  -debug
      Enable debugging information
  -exclude-cdn
      Skip full port scans for CDNs (only checks for 80,443)
  -exclude-file string
      Specifies a newline-delimited file with targets to be excluded from the scan (ip, cidr)
  -exclude-hosts string
      Specifies a comma-separated list of targets to be excluded from the scan (ip, cidr)
  -exclude-ports string
      Ports to exclude from enumeration
  -host string
      Host to find ports for
  -iL string
      File containing list of hosts to enumerate ports
  -interface string
      Network Interface to use for port scan
  -interface-list
      List available interfaces and public ip
  -json
      Write output in JSON lines Format
  -nmap
      Invoke nmap scan on targets (nmap must be installed)
  -nmap-cli string
      Nmap command line (invoked as COMMAND + TARGETS)
  -no-color
      Don't Use colors in output
  -o string
      File to write output to (optional)
  -p string
      Ports to scan (80, 80,443, 100-200, (-p - for full port scan)
  -ping
      Use ping probes for verification of host
  -ports-file string
      File containing ports to enumerate for on hosts
  -rate int
      Rate of port scan probe requests (default 1000)
  -retries int
      Number of retries for the port scan probe (default 3)
  -s string
      Scan Type (s - SYN, c - CONNECT) (default "s")
  -scan-all-ips
      Scan all the ips
  -silent
      Show found ports only in output
  -source-ip string
      Source Ip
  -stats
      Display stats of the running scan
  -timeout int
      Millisecond to wait before timing out (default 1000)
  -top-ports string
      Top Ports to scan (default top 100)
  -v  Show Verbose output
  -verify
      Validate the ports again with TCP verification
  -version
      Show version of naabu
  -warm-up-time int
      Time in seconds between scan phases (default 2)

Installation Instructions

Download the ready to run binary / docker or install with GO

Before installing naabu, make sure to install libpcap library with apt install -y libpcap-dev on Linux

GO111MODULE=on go get -v github.com/projectdiscovery/naabu/v2/cmd/naabu

Running Naabu

To run the tool on a target, just use the following command.

naabu -host hackerone.com

This will run the tool against hackerone.com. There are a number of configuration options that you can pass along with this command. The verbose switch -v can be used to display verbose information.

naabu -host hackerone.com

                  __
  ___  ___  ___ _/ /  __ __
 / _ \/ _ \/ _ \/ _ \/ // /
/_//_/\_,_/\_,_/_.__/\_,_/ v2.0.3

    projectdiscovery.io

[WRN] Use with caution. You are responsible for your actions
[WRN] Developers assume no liability and are not responsible for any misuse or damage.
[INF] Running SYN scan with root privileges
[INF] Found 4 ports on host hackerone.com (104.16.100.52)
hackerone.com:80
hackerone.com:443
hackerone.com:8443
hackerone.com:8080

The ports to scan for on the host can be specified via -p parameter. It takes nmap format ports and runs enumeration on them.

naabu -p 80,443,21-23 -host hackerone.com

By default, the Naabu checks for nmap’s Top 100 ports. It supports following in-built port lists –

• -top-ports 100 => Scans for nmap top 100 port
• -top-ports 1000 => Scans for nmap top 1000 port
• -p - => Scans for all ports from 1-65535.

You can also specify specific ports which you would like to exclude from the scan.

naabu -p - -exclude-ports 80,443

The o flag can be used to specify an output file.

naabu -host hackerone.com -o output.txt

To run the naabu on a list of hosts, -iL option can be used.

naabu -iL hosts.txt

You can also get output in json format using -json switch. This switch saves the output in the JSON lines format.

naabu -host hackerone.com -json

{"host":"hackerone.com","ip":"104.16.99.52","port":8443}
{"host":"hackerone.com","ip":"104.16.99.52","port":80}
{"host":"hackerone.com","ip":"104.16.99.52","port":443}
{"host":"hackerone.com","ip":"104.16.99.52","port":8080}

The ports discovered can be piped to other tools too. For example, you can pipe the ports discovered by naabu to naabu which will then find running http servers on the host.

echo hackerone.com | naabu -silent | naabu -silent

http://hackerone.com:8443
http://hackerone.com:443
http://hackerone.com:8080
http://hackerone.com:80

If you want a second layer validation of the ports found, you can instruct the tool to make a TCP connection for every port and verify if the connection succeeded. This method is very slow, but is really reliable. This is similar to using nmap as a second layer validation

naabu -host hackerone.com -verify

The speed can be controlled by changing the value of rate flag that represent the number of packets per second. Increasing it while processing hosts may lead to increased false-positive rates. So it is recommended to keep it to a reasonable amount.

Configuration File

We have added support for config file, it allows each and every flag to define in config file, so you don’t have to write them everytime, it’s optional and not used on default run, default location of config file is $HOME/.config/naabu/naabu.conf, custom config file can be provided using config flag.

Example Config File

# Number of retries
# retries: 1
# Packets rate
# rate: 100
# Timeout is the seconds to wait for ports to respond
# timeout: 5
# Hosts are the host to find ports for
# host:
#   - 10.10.10.10
# Ports is the ports to use for enumeration
# ports:
#   - 80
#   - 100
# ExcludePorts is the list of ports to exclude from enumeration
# exclude-ports:
#   - 20
#   - 30
# Verify is used to check if the ports found were valid using CONNECT method
# verify: false
# Ips or cidr to be excluded from the scan
# exclude-ips:
#   - 1.1.1.1
#   - 2.2.2.2
# Top ports list
# top-ports: 100
# Attempts to run as root
# privileged: true
# Drop root privileges
# unprivileged: true
# Excludes ip of knows CDN ranges
# exclude-cdn: true
# SourceIP to use in TCP packets
# source-ip: 10.10.10.10
# Interface to use for TCP packets
# interface: eth0
# WarmUpTime between scan phases
# warm-up-time: 2
# nmap command to invoke after scanninginvoke after scanning
# nmap: nmap -sV

Nmap Integration

We have integrated nmap support with nmap flag, in config file you can define any nmap command you wish to run on the result of naabu, make sure you have nmap installed to use this feature.

To make use of nmap flag, make sure to remove the comments from the config file at $HOME/.config/naabu/naabu.conf

We also added nmap-cli flag that let you run nmap commands directly on the results of naabu without making use of config file.

echo hackerone.com | naabu -nmap-cli 'nmap -sV -oX naabu-output'
                  __       
  ___  ___  ___ _/ /  __ __
 / _ \/ _ \/ _ \/ _ \/ // /
/_//_/\_,_/\_,_/_.__/\_,_/ v2.0.0        

    projectdiscovery.io

[WRN] Use with caution. You are responsible for your actions
[WRN] Developers assume no liability and are not responsible for any misuse or damage.
[INF] Running TCP/ICMP/SYN scan with root privileges
[INF] Found 4 ports on host hackerone.com (104.16.99.52)

hackerone.com:443
hackerone.com:80
hackerone.com:8443
hackerone.com:8080

[INF] Running nmap command: nmap -sV -p 80,8443,8080,443 104.16.99.52

Starting Nmap 7.01 ( https://nmap.org ) at 2020-09-23 05:02 UTC
Nmap scan report for 104.16.99.52
Host is up (0.0021s latency).
PORT     STATE SERVICE       VERSION
80/tcp   open  http          cloudflare
443/tcp  open  ssl/https     cloudflare
8080/tcp open  http-proxy    cloudflare
8443/tcp open  ssl/https-alt cloudflare

CDN Exclusion

Naabu also supports excluding CDN IPs being port scanned. If used, only 80 and 443 ports get scanned for those IPs. This feature can be enabled by using exclude-cdn flag.

Currently cloudflare, akamai, incapsula and sucuri IPs are supported for exclusions.

Notes

• Naabu is designed to scan ports on multiple hosts / mass port scanning.
• As default naabu is configured with a assumption that you are running it from VPS.
• We suggest to tune the flags / rate if running naabu from local system.
• For best results, run naabu as root user.