CDNRECON - A Content Delivery Network recon tool

CDNRECON is a reconnaissance tool that tries to find the origin or backend IP address of a website protected by a CDNs reverse proxy. You can use it to get a head start when penetration testing a client protected by one aswell as to find possible misconfigurations on your own server. What ever your use case may be, CDNRECON can also be used as a general recon / scanning tool since it automates some common recon tasks in the process.

The things CDNRECON does:

• Checks the target domain nameservers
• Dumps DNS records with DNSDumpster
• Checks common subdomains and gets their IP addresses
• Checks if any of the IP addresses belong to Cloudflare
• Checks if any of the IP addresses belong to Akamai
• Checks if any of the IP addresses are using the AkamaiGHost server
• Optionally returns data from Shodan for possibly leaked IP addresses
• Optionally writes the results to target.com-results.txt file

Shodan API keys are NOT required. Altough it's recommended to supply them for maximum output, CDNRECON tries other things before using them.

Checking the nameservers, common subdomains and their IP addresses

   __________  _   ______  ________________  _   __
  / ____/ __ \/ | / / __ \/ ____/ ____/ __ \/ | / /
 / /   / / / /  |/ / /_/ / __/ / /   / / / /  |/ / 
/ /___/ /_/ / /|  / _, _/ /___/ /___/ /_/ / /|  /  
\____/_____/_/ |_/_/ |_/_____/\____/\____/_/ |_/   
                                                  

[i] Checking cloudflare.com nameservers . . .
[+] cloudflare.com is pointing to Cloudflares nameservers
[+] Nameservers: ['ns3.cloudflare.com.', 'ns7.cloudflare.com.', 'ns4.cloudflare.com.', 'ns5.cloudflare.com.', 'ns6.cloudflare.com.']
==================================================
[i] Checking common subdomains . . .
[+] www.cloudflare.com is a valid domain
[+] mail.cloudflare.com is a valid domain
[+] blog.cloudflare.com is a valid domain
[+] support.cloudflare.com is a valid domain
==================================================
[i] Getting subdomain IP addresses . . .
[+] www.cloudflare.com has an IP address of 104.16.124.96
[+] mail.cloudflare.com has an IP address of 216.58.210.147
[+] blog.cloudflare.com has an IP address of 172.64.146.82
[+] support.cloudflare.com has an IP address of 104.18.39.119
==================================================

Checking if the IP addresses belong to Cloudflare

==================================================
[i] Checking if 104.16.124.96 is Cloudflare . . .
[+] 104.16.124.96 is Cloudflare
[+] Ray-ID: 7556c47a2d879914-ARN
[+] Country: Canada
[i] Checking if 216.58.210.147 is Cloudflare . . .
[!] 216.58.210.147 is NOT cloudflare
[i] Checking if 104.18.41.174 is Cloudflare . . .
[+] 104.18.41.174 is Cloudflare
[+] Ray-ID: 7556c47c8bb615dc-ARN
[+] Country: Canada
[i] Checking if 104.18.39.119 is Cloudflare . . .
[+] 104.18.39.119 is Cloudflare
[+] Ray-ID: 7556c47e0d3afe2c-HEL
[+] Country: Canada
  

Checking if the IP addresses belong to Akamai and if they're using the AkamaiGHost server

[i] Checking if 23.61.197.234 is Akamai . . .
[+] 23.61.197.234 Server detected as AkamaiGHost
[+] Country: Sweden
[i] Checking if 95.101.93.134 is Akamai . . .
[+] 95.101.93.134 Server detected as AkamaiGHost
[+] Country: Sweden
==================================================

Returns data for non Cloudflare IP addresses from Shodan

[i] Shodan results for 23.61.197.234
[+] ISP: Akamai Technologies, Inc.
[+] Country: Sweden
[+] Hostname(s): ['a23-61-197-234.deploy.static.akamaitechnologies.com', 'kbb.com']
[+] Domain(s): ['akamaitechnologies.com', 'kbb.com']
[+] Open port(s): [80, 443]
[i] Shodan results for 95.101.93.134
[+] ISP: Akamai Technologies, Inc.
[+] Country: Sweden
[+] Hostname(s): ['a95-101-93-134.deploy.static.akamaitechnologies.com', 'kbb.com']
[+] Domain(s): ['akamaitechnologies.com', 'kbb.com']
[+] Open port(s): [80, 443]

Installation and usage

Requires atleast python version 3.6 since it uses f-strings.

Tested on Arch Linux. It should work on any Linux distribution and Windows.

Clone the repository

$ sudo git clone https://github.com/Juuso1337/CDNRECON

Install the required depencies

$ cd CDNRECON
$ pip install https://github.com/PaulSec/API-dnsdumpster.com/archive/master.zip --user
$ pip3 install -r requirements.txt

Sample usage guide

$ python3 main.py example.com shodan-key

For more in-depth usage info, supply the -h flag (python3 main.py -h).

usage: main.py [-h] [--write] domain [shodan]

CDNRECON - A Content Delivery Network recon tool

positional arguments:
  domain      Domain to scan
  shodan      Your Shodan API key

options:
  -h, --help  show this help message and exit
  --write     Write results to a target.com-results.txt file

How to get a Shodan API key

1. Register an account at https://account.shodan.io/ (it's totally free).
2. Head over the to the "Account" page and see the "API key" field.

To do

• Add more CDNs
• Add Censys support
• Add certificate search
• Add IPv4 range bruteforcer
• Add favicon hash search
• Add html body hash search