interactsh

README

An OOB interaction gathering server and client library

Features • Usage • Interactsh Client • Interactsh Server • Interactsh Integration • Join Discord

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Interactsh is an open-source tool for detecting out-of-band interactions. It is a tool designed to detect vulnerabilities that cause external interactions.

Features

• DNS/HTTP(S)/SMTP(S)/LDAP Interaction
• CLI / Web / Burp / ZAP / Docker client
• AES encryption with zero logging
• Automatic ACME based Wildcard TLS w/ Auto Renewal
• DNS Entries for Cloud Metadata service
• Self-Hosted Interactsh Server
• NTLM/SMB/FTP/RESPONDER Listener (self-hosted)
• Wildcard / Protected Interactions (self-hosted)
• Customizable Payload Length (self-hosted)
• Custom SSL Certificate (self-hosted)

Interactsh Client

Usage

interactsh-client -h

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

Usage:
  ./interactsh-client [flags]

Flags:
INPUT:
   -s, -server string  interactsh server(s) to use (default "oast.pro,oast.live,oast.site,oast.online,oast.fun,oast.me")

CONFIG:
   -config string                           flag configuration file (default "$HOME/.config/interactsh-client/config.yaml")
   -n, -number int                          number of interactsh payload to generate (default 1)
   -t, -token string                        authentication token to connect protected interactsh server
   -pi, -poll-interval int                  poll interval in seconds to pull interaction data (default 5)
   -nf, -no-http-fallback                   disable http fallback registration
   -cidl, -correlation-id-length int        length of the correlation id preamble (default 20)
   -cidn, -correlation-id-nonce-length int  length of the correlation id nonce (default 13)
   -sf, -session-file string                store/read from session file

FILTER:
   -dns-only   display only dns interaction in CLI output
   -http-only  display only http interaction in CLI output
   -smtp-only  display only smtp interactions in CLI output

OUTPUT:
   -o string  output file to write interaction data
   -json      write output in JSONL(ines) format
   -v         display verbose interaction

Interactsh CLI Client

Interactsh Cli client requires go1.17+ to install successfully. Run the following command to get the repo -

go install -v github.com/projectdiscovery/interactsh/cmd/interactsh-client@latest

Default Run

This will generate a unique payload that can be used for OOB testing with minimal interaction information in the output.

interactsh-client

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v0.0.5

        projectdiscovery.io

[INF] Listing 1 payload for OOB Testing
[INF] c23b2la0kl1krjcrdj10cndmnioyyyyyn.oast.pro

[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received DNS interaction (A) from 172.253.226.100 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received DNS interaction (AAAA) from 32.3.34.129 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received HTTP interaction from 43.22.22.50 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received DNS interaction (MX) from 43.3.192.3 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received DNS interaction (TXT) from 74.32.183.135 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received SMTP interaction from 32.85.166.50 at 2021-26-26 12:26

Session File

interactsh-client with -sf, -session-file flag can be used store/read the current session information from user defined file which is useful to resume the same session to poll the interactions even after the client gets stopped or closed.

interactsh-client -sf interact.session

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ 1.0.3

        projectdiscovery.io

[INF] Listing 1 payload for OOB Testing
[INF] c23b2la0kl1krjcrdj10cndmnioyyyyyn.oast.pro

[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received DNS interaction (A) from 172.253.226.100 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received DNS interaction (AAAA) from 32.3.34.129 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received HTTP interaction from 43.22.22.50 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received DNS interaction (MX) from 43.3.192.3 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received DNS interaction (TXT) from 74.32.183.135 at 2021-26-26 12:26
[c23b2la0kl1krjcrdj10cndmnioyyyyyn] Received SMTP interaction from 32.85.166.50 at 2021-26-26 12:26

Verbose Mode

Running the interactsh-client in verbose mode (v) to see the whole request and response, along with an output file to analyze afterwards.

interactsh-client -v -o interactsh-logs.txt

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ 1.0.3

    projectdiscovery.io

[INF] Listing 1 payload for OOB Testing
[INF] c58bduhe008dovpvhvugcfemp9yyyyyyn.oast.pro

[c58bduhe008dovpvhvugcfemp9yyyyyyn] Received HTTP interaction from 103.22.142.211 at 2021-09-26 18:08:07
------------
HTTP Request
------------

GET /favicon.ico HTTP/2.0
Host: c58bduhe008dovpvhvugcfemp9yyyyyyn.oast.pro
Referer: https://c58bduhe008dovpvhvugcfemp9yyyyyyn.oast.pro
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36


-------------
HTTP Response
-------------

HTTP/1.1 200 OK
Connection: close
Content-Type: text/html; charset=utf-8
Server: oast.pro

<html><head></head><body>nyyyyyy9pmefcguvhvpvod800ehudb85c</body></html>

Using Self-Hosted server

Using the server flag, interactsh-client can be configured to connect with a self-hosted Interactsh server, this flag accepts single or multiple server separated by comma.

interactsh-client -server hackwithautomation.com

We maintain a list of default Interactsh servers to use with interactsh-client:

• oast.pro
• oast.live
• oast.site
• oast.online
• oast.fun
• oast.me

Default servers are subject to change/rotate/down at any time, thus we recommend using a self-hosted interactsh server if you are experiencing issues with the default server.

Using Protected Self-Hosted server

Using the token flag, interactsh-client can connect to a self-hosted Interactsh server that is protected with authentication.

interactsh-client -server hackwithautomation.com -token XXX

Using with Notify

If you are away from your terminal, you may use notify to send a real-time interaction notification to any supported platform.

interactsh-client | notify

Interactsh Web Client

Interactsh-web is a free and open-source web client that displays Interactsh interactions in a well-managed dashboard in your browser. It uses the browser's local storage to store and display all incoming interactions. By default, the web client is configured to use interact.sh as default interactsh server, and supports other self-hosted public/authencaited interactsh servers as well.

A hosted instance of interactsh-web client is available at https://app.interactsh.com

Interactsh Docker Client

A Docker image is also provided with interactsh client that is ready to run and can be used in the following way:

docker run projectdiscovery/interactsh-client:latest

docker run projectdiscovery/interactsh-client:latest

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v1.0.0

        projectdiscovery.io

[INF] Listing 1 payload for OOB Testing
[INF] c59e3crp82ke7bcnedq0cfjqdpeyyyyyn.oast.pro

Burp Suite Extension

interactsh-collaborator is Burp Suite extension developed and maintained by @wdahlenb

• Download latest JAR file from releases page.
• Open Burp Suite → Extender → Add → Java → Select JAR file → Next
• New tab named Interactsh will be appeared upon successful installation.
• See the interactsh-collaborator project for more info.

OWASP ZAP Add-On

Interactsh can be used with OWASP ZAP via the OAST add-on for ZAP. With ZAP's scripting capabilities, you can create powerful out-of-band scan rules that leverage Interactsh's features. A standalone script template has been provided as an example (it is added automatically when you install the add-on).

• Install the OAST add-on from the ZAP Marketplace.
• Go to Tools → Options → OAST and select Interactsh.
• Configure the options for the client and click on "New Payload" to generate a new payload.
• OOB interactions will appear in the OAST Tab and you can click on any of them to view the full request and response.
• See the OAST add-on documentation for more info.

---

Interactsh Server

Interactsh server runs multiple services and captures all the incoming requests. To host an instance of interactsh-server, you are required to have the follow requirements:

1. Domain name with custom host names and nameservers.
2. Basic droplet running 24/7 in the background.

Usage

interactsh-server -h

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

Usage:
  ./interactsh-server [flags]

Flags:
INPUT:
   -d, -domain string                       configured domain to use with interactsh server
   -ip string                               public ip address to use for interactsh server
   -lip, -listen-ip string                  public ip address to listen on (default "0.0.0.0")
   -e, -eviction int                        number of days to persist interaction data in memory (default 30)
   -a, -auth                                enable authentication to server using random generated token
   -t, -token string                        enable authentication to server using given token
   -acao-url string                         origin url to send in acao header (required to use web-client)
   -sa, -skip-acme                          skip acme registration (certificate checks/handshake + TLS protocols will be disabled)
   -se, -scan-everywhere                    scan canary token everywhere
   -cidl, -correlation-id-length int        length of the correlation id preamble (default 20)
   -cidn, -correlation-id-nonce-length int  length of the correlation id nonce (default 13)
   -cert string                             custom certificate path
   -privkey string                          custom private key path

SERVICES:
   -dns-port int           port to use for dns service (default 53)
   -http-port int          port to use for http service (default 80)
   -https-port int         port to use for https service (default 443)
   -smtp-port int          port to use for smtp service (default 25)
   -smtps-port int         port to use for smtps service (default 587)
   -smtp-autotls-port int  port to use for smtps autotls service (default 465)
   -ldap-port int          port to use for ldap service (default 389)
   -ldap                   enable ldap server with full logging (authenticated)
   -wc, -wildcard          enable wildcard interaction for interactsh domain (authenticated)
   -smb                    start smb agent - impacket and python 3 must be installed (authenticated)
   -responder              start responder agent - docker must be installed (authenticated)
   -ftp                    start ftp agent (authenticated)
   -smb-port int           port to use for smb service (default 445)
   -ftp-port int           port to use for ftp service (default 21)
   -ftp-dir string         ftp directory - temporary if not specified

DEBUG:
   -debug  start interactsh server in debug mode

We are using GoDaddy for domain name and DigitalOcean droplet for the server, a basic $5 droplet should be sufficient to run self-hosted Interactsh server. If you are not using GoDaddy, follow your registrar's process for creating / updating DNS entries.

Configuring Interactsh domain Navigate to https://dcc.godaddy.com/manage/{{domain}}/dns/hosts Advanced Features → Host names → Add → Submit ns1, ns2 with your SERVER_IP as value Navigate to https://dns.godaddy.com/{{domain}}/nameservers I'll use my own nameservers → Submit ns1.INTERACTSH_DOMAIN, ns2.INTERACTSH_DOMAIN

Configuring Interactsh server Install interactsh-server on your VPS go install -v github.com/projectdiscovery/interactsh/cmd/interactsh-server@latest Considering domain name setup is completed, run the below command to run interactsh-server interactsh-server -domain INTERACTSH_DOMAIN Following is an example of a successful installation and operation of a self-hosted server: A number of needed flags are configured automatically to run interactsh-server with default settings. For example, ip and listen-ip flags set with the Public IP address of the system when possible.

Running Interactsh Server

interactsh-server -domain interact.sh

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v1.0.0

                projectdiscovery.io

[INF] Listening with the following services:
[HTTPS] Listening on TCP 46.101.25.250:443
[HTTP] Listening on TCP 46.101.25.250:80
[SMTPS] Listening on TCP 46.101.25.250:587
[LDAP] Listening on TCP 46.101.25.250:389
[SMTP] Listening on TCP 46.101.25.250:25
[DNS] Listening on TCP 46.101.25.250:53
[DNS] Listening on UDP 46.101.25.250:53

There are more useful capabilities supported by interactsh-server that are not enabled by default and are intended to be used only by self-hosted servers.

Wildcard Interaction

To enable wildcard interaction for configured Interactsh domain wildcard flag can be used with implicit authentication protection via the auth flag if the token flag is omitted.

interactsh-server -domain hackwithautomation.com -wildcard

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v1.0.0

        projectdiscovery.io

[INF] Client Token: 699c55544ce1604c63edb769e51190acaad1f239589a35671ccabd664385cfc7
[INF] Listening with the following services:
[HTTPS] Listening on TCP 157.230.223.165:443
[HTTP] Listening on TCP 157.230.223.165:80
[SMTPS] Listening on TCP 157.230.223.165:587
[LDAP] Listening on TCP 157.230.223.165:389
[SMTP] Listening on TCP 157.230.223.165:25
[DNS] Listening on TCP 157.230.223.165:53
[DNS] Listening on UDP 157.230.223.165:53

LDAP Interaction

As default, Interactsh server support LDAP interaction for the payload included in search query, additionally ldap flag can be used for complete logging.

interactsh-server -domain hackwithautomation.com -sa -ldap

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v1.0.0

        projectdiscovery.io

[INF] Client Token: deb58fc151e6f0e53d448be3eb14cd7a11590d8950d142b9cd1abac3c2e3e7bc
[INF] Listening with the following services:
[DNS] Listening on UDP 157.230.223.165:53
[LDAP] Listening on TCP 157.230.223.165:389
[HTTP] Listening on TCP 157.230.223.165:80
[SMTP] Listening on TCP 157.230.223.165:25
[DNS] Listening on TCP 157.230.223.165:53

Custom Payload Length

The length of the interactsh payload is 33 by default, consisting of 20 (unique correlation-id) + 13 (nonce token), which can be customized using the cidl and cidn flags to make shorter when required with self-hosted interacsh server.

interactsh-server -d hackwithautomation.com -cidl 4 -cidn 6

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v1.0.2

        projectdiscovery.io

[INF] Loading existing SSL Certificate for:  [*.hackwithautomation.com, hackwithautomation.com]
[INF] Listening with the following services:
[HTTPS] Listening on TCP 157.230.223.165:443
[SMTPS] Listening on TCP 157.230.223.165:587
[DNS] Listening on UDP 157.230.223.165:53
[HTTP] Listening on TCP 157.230.223.165:80
[LDAP] Listening on TCP 157.230.223.165:389
[SMTP] Listening on TCP 157.230.223.165:25
[DNS] Listening on TCP 157.230.223.165:53

Note: It is important and required to use same length on both side (client and server), otherwise co-relation will not work.

interactsh-client -s hackwithautomation.com -cidl 4 -cidn 6

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v1.0.2

        projectdiscovery.io

[INF] Listing 1 payload for OOB Testing
[INF] c8rf4e8xm4.hackwithautomation.com

Custom SSL Certificate

The certmagic library is used by default by interactsh server to produce wildcard certificates for requested domain in an automatic way. To use your own SSL certificate with self-hosted interactsh server, cert and privkey flag can be used to provider required certificate files.

Note: To utilize all of the functionality of the SSL protocol, a wildcard certificate is mandatory.

interactsh-server -d hackwithautomation.com -cert hackwithautomation.com.crt -privkey hackwithautomation.com.key

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v1.0.2

        projectdiscovery.io

[INF] Listening with the following services:
[HTTPS] Listening on TCP 157.230.223.165:443
[SMTP] Listening on TCP 157.230.223.165:25
[HTTP] Listening on TCP 157.230.223.165:80
[LDAP] Listening on TCP 157.230.223.165:389
[DNS] Listening on TCP 157.230.223.165:53
[SMTPS] Listening on TCP 157.230.223.165:587
[DNS] Listening on UDP 157.230.223.165:53

Interactsh Integration

Use as library

The below example uses interactsh client library to get external interactions for a generated URL by making a http request to the URL.

package main

import (
	"fmt"
	"net/http"
	"time"

	"github.com/projectdiscovery/interactsh/pkg/client"
	"github.com/projectdiscovery/interactsh/pkg/server"
)

func main() {
	client, err := client.New(client.DefaultOptions)
	if err != nil {
		panic(err)
	}
	defer client.Close()

	client.StartPolling(time.Duration(1*time.Second), func(interaction *server.Interaction) {
		fmt.Printf("Got Interaction: %v => %v\n", interaction.Protocol, interaction.FullId)
	})
	defer client.StopPolling()

	URL := client.URL()

	resp, err := http.Get("https://" + URL)
	if err != nil {
		panic(err)
	}
	resp.Body.Close()

	fmt.Printf("Got URL: %v => %v\n", URL, resp)
	time.Sleep(5 * time.Second)
}

Nuclei - OAST

Nuclei vulnerability scanner utilize Interactsh for automated payload generation and detection of out of band based security vulnerabilities.

See Nuclei + Interactsh Integration blog and guide document for more information.

Cloud Metadata

Interactsh server supports DNS records for cloud metadata services, which is useful for testing SSRF-related vulnerabilities.

Currently supported metadata services:

• AWS
• Alibaba

Example:

• aws.interact.sh points to 169.254.169.254
• alibaba.interact.sh points to 100.100.100.200

---

Acknowledgement

Interactsh is inspired from Burp Collaborator.

License

Interactsh is distributed under MIT License and made with 🖤 by the projectdiscovery team.