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cve_2023_3519_inspector.py
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cve_2023_3519_inspector.py
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#!/usr/bin/env python3
# coding=utf-8
#
# AUTHOR
# Bryan Smith (@securekomodo)
import argparse
import requests
from bs4 import BeautifulSoup
import re
import logging
import warnings
import sys
import subprocess
import pkg_resources
import datetime
from xml.etree import ElementTree as ET
from urllib.parse import urlparse
# How many checks per URL
MAX_RETRIES = 5
# Check if the OpenSSL version is the one required
REQUIRED_VERSION = "1.26.6"
try:
# Get the current version of urllib3
current_version = pkg_resources.get_distribution("urllib3").version
except pkg_resources.DistributionNotFound:
current_version = None
# Check if the urllib3 version is not the one required
if current_version != REQUIRED_VERSION:
# Install the specific version of urllib3 (OSX Fix)
subprocess.call([sys.executable, "-m", "pip", "install", f'urllib3=={REQUIRED_VERSION}'])
# Ignore all the SSL/TLS certificate warnings
warnings.filterwarnings('ignore')
# Able to determine patched versions now :)
# THANKS https://github.com/telekom-security/cve-2023-3519-citrix-scanner/blob/main/CVE-2023-3519-checker.py
PATCHED_VERSIONS = [
{"version": "13.0-91.13", "timestamp": "Fri, 07 Jul 2023 15:39:40 GMT"},
{"version": "13.1-49.13", "timestamp": "Mon, 10 Jul 2023 17:41:17 GMT"},
{"version": "13.1-49.13", "timestamp": "Mon, 10 Jul 2023 18:36:14 GMT"}
]
# some common web shell names and some IOCs mandiant discovered
POTENTIALLY_COMPROMISED_FILES = [
"alfav3-encoded.php",
"alfav4.1-decoded.php",
"alfav4.1-encoded.php",
"andela.php",
"bloodsecv4.php",
"by.php",
"c99ud.php",
"cmd.php",
"configkillerionkros.php",
"mini.php",
"obfuscated-punknopass.php",
"punk-nopass.php",
"punkholic.php",
"r57.php",
"smevk.php",
"TwemlowsWebShell.php",
"wso2.8.5.php",
"insight-new-min.js",
"info.php",
"prod.php",
"log.php",
"logout.php",
"vpn.php",
"config.php",
"shell.php",
"poc.php",
"rshell.php",
"php-reverse-shell.php",
]
# The array of hashes and corresponding versions.
hash_versions = [
{"vhash": "26df0e65fba681faaeb333058a8b28bf", "version": "12.1-50.28"},
{"vhash": "d3b5c691a4cfcc6769da8dc4e40f511d", "version": "12.1-50.31"},
{"vhash": "995a76005c128f4e89474af12ac0de66", "version": "12.1-51.16"},
{"vhash": "d2bd166fed66cdf035a0778a09fd688c", "version": "12.1-51.19"},
{"vhash": "86b4b2567b05dff896aae46d6e0765bc", "version": "13.0-36.27"},
{"vhash": "43a8abf580ea09a5fa8aa1bd579280b9", "version": "13.0-41.20"},
{"vhash": "7116ed70ec000da9267a019728ed951e", "version": "13.0-41.28"},
{"vhash": "8c62b39f7068ea2f3d3f7d40860c0cd4", "version": "12.1-55.13"},
{"vhash": "fedb4ba86b5edcbc86081f2893dc9fdf", "version": "13.0-47.22"},
{"vhash": "02d30141fd053d5c3448bf04fbedb8d6", "version": "12.1-55.18"},
{"vhash": "fd96bc8977256003de05ed84270b90bb", "version": "13.0-47.24"},
{"vhash": "f787f9a8c05a502cd33f363e1e9934aa", "version": "12.1-55.24"},
{"vhash": "e79f3bbf822c1fede6b5a1a4b6035a41", "version": "13.0-52.24"},
{"vhash": "f2db014a3eb9790a19dfd71331e7f5d0", "version": "12.1-56.22"},
{"vhash": "fdf2235967556bad892fbf29ca69eefd", "version": "13.0-58.30"},
{"vhash": "4ecb5abf6e4b1655c07386a2c958597c", "version": "12.1-57.18"},
{"vhash": "dcb06155d51a0234e9d127658ef9f21f", "version": "13.0-58.32"},
{"vhash": "12c4901ecc3677aad06f678be49cb837", "version": "13.0-61.48"},
{"vhash": "b1b38debf0e55c285c72465da3715034", "version": "12.1-58.15"},
{"vhash": "06fbfcf525e47b5538f856965154e28c", "version": "13.0-64.35"},
{"vhash": "7a0c8874e93395c5e4f1ef3e5e600a25", "version": "12.1-59.16"},
{"vhash": "a8e0eb4a1b3e157e0d3a5e57dc46fd35", "version": "13.0-67.39"},
{"vhash": "0aef7f8e9ea2b528aa2073f2875a28b8", "version": "12.1-55.190"},
{"vhash": "e2444db11d0fa5ed738aa568c2630704", "version": "13.0-67.43"},
{"vhash": "9b545e2e4d153348bce08e3923cdfdc1", "version": "13.0-71.40"},
{"vhash": "25ad60e92a33cbb5dbd7cd8c8380360d", "version": "13.0-71.44"},
{"vhash": "0b516b768edfa45775c4be130c4b96b5", "version": "12.1-60.19"},
{"vhash": "b3deb35b8a990a71acca052fd1e6e6e1", "version": "12.1-55.210"},
{"vhash": "83e486e7ee7eb07ab88328a51466ac28", "version": "12.1-61.18"},
{"vhash": "454d4ccdefa1d802a3f0ca474a2edd73", "version": "13.0-76.29"},
{"vhash": "08ff522057b9422863dbabb104c7cf4b", "version": "12.1-61.19"},
{"vhash": "648767678188e1567b7d15eee5714220", "version": "13.0-76.31"},
{"vhash": "ce5da251414abbb1b6aed6d6141ed205", "version": "12.1-61.19"},
{"vhash": "5e55889d93ff0f13c39bbebb4929a68e", "version": "13.0-79.64"},
{"vhash": "35389d54edd8a7ef46dadbd00c1bc5ac", "version": "12.1-62.21"},
{"vhash": "8e4425455b9da15bdcd9d574af653244", "version": "12.1-62.23"},
{"vhash": "73952bdeead9629442cd391d64c74d93", "version": "13.0-82.41"},
{"vhash": "25169dea48ef0f939d834468f3c626d2", "version": "13.0-82.42"},
{"vhash": "efb9d8994f9656e476e80f9b278c5dae", "version": "12.1-62.25"},
{"vhash": "e1ebdcea7585d24e9f380a1c52a77f5d", "version": "12.1-62.27"},
{"vhash": "eb3f8a7e3fd3f44b70c121101618b80d", "version": "13.0-82.45"},
{"vhash": "98a21b87cc25d486eb4189ab52cbc870", "version": "13.1-4.43"},
{"vhash": "c9e95a96410b8f8d4bde6fa31278900f", "version": "13.0-83.27"},
{"vhash": "f3d4041188d723fec4547b1942ffea93", "version": "12.1-63.22"},
{"vhash": "158c7182df4973f1f5346e21e9d97a01", "version": "13.1-4.44"},
{"vhash": "a66c02f4d04a1bd32bfdcc1655c73466", "version": "13.0-83.29"},
{"vhash": "5cd6bd7d0aec5dd13a1afb603111733a", "version": "12.1-63.23"},
{"vhash": "645bded68068748e3314ad3e3ec8eb8f", "version": "13.1-9.60"},
{"vhash": "5112d5394de0cb5f6d474e032a708907", "version": "13.1-12.50"},
{"vhash": "3a316d2de5362e9f76280b3157f48d08", "version": "13.0-84.10"},
{"vhash": "ee44bd3bc047aead57bc000097e3d8aa", "version": "12.1-63.24"},
{"vhash": "2b46554c087d2d5516559e9b8bc1875d", "version": "13.0-84.11"},
{"vhash": "cf9d354b261231f6c6121058ba143af7", "version": "13.1-12.51"},
{"vhash": "c6bcd2f119d83d1de762c8c09b482546", "version": "12.1-64.16"},
{"vhash": "b3fb0319d5d2dad8c977b9986cc26bd8", "version": "12.1-55.265"},
{"vhash": "0f3a063431972186f453e07954f34eb8", "version": "13.1-17.42"},
{"vhash": "e42d7b3cf4a6938aecebdae491ba140c", "version": "13.0-85.15"},
{"vhash": "2edf0f445b69b2e322e80dbc3f6f711c", "version": "12.1-55.276"},
{"vhash": "b4ac9c8852a04234f38d73d1d8238d37", "version": "13.1-21.50"},
{"vhash": "9f73637db0e0f987bf7825486bfb5efe", "version": "12.1-55.278"},
{"vhash": "c212a67672ef2da5a74ecd4e18c25835", "version": "12.1-64.17"},
{"vhash": "fbdc5fbaed59f858aad0a870ac4a779c", "version": "12.1-65.15"},
{"vhash": "1884e7877a13a991b6d3fac01efbaf79", "version": "13.0-85.19"},
{"vhash": "853edb55246c138c530839e638089036", "version": "13.1-24.38"},
{"vhash": "7a45138b938a54ab056e0c35cf0ae56c", "version": "13.0-86.17"},
{"vhash": "4434db1ec24dd90750ea176f8eab213c", "version": "12.1-65.17"},
{"vhash": "469591a5ef8c69899320a319d5259922", "version": "12.1-55.282"},
{"vhash": "adc1f7c850ca3016b21776467691a767", "version": "13.1-27.59"},
{"vhash": "1f63988aa4d3f6d835704be50c56788a", "version": "13.0-87.9"},
{"vhash": "57d9f58db7576d6a194d7dd10888e35", "version": "13.1-30.52"},
{"vhash": "7afe87a42140b566a2115d1e232fdc07", "version": "13.1-33.47"},
{"vhash": "c1b64cea1b80e973580a73b787828daf", "version": "12.1-65.21"},
{"vhash": "4d817946cef53571bc303373fd6b406b", "version": "12.1-55.289"},
{"vhash": "aff0ad8c8a961d7b838109a7ee532bcb", "version": "13.1-33.49"},
{"vhash": "37c10ac513599cf39997d52168432c0e", "version": "13.0-88.12"},
{"vhash": "27292ddd74e24a311e4269de9ecaa6e7", "version": "13.0-88.13"},
{"vhash": "5e939302a9d7db7e35e63a39af1c7bec", "version": "13.1-33.51"},
{"vhash": "6e7b2de88609868eeda0b1baf1d34a7e", "version": "13.0-88.14"},
{"vhash": "56672635f81a1ce1f34f828fef41d2fa", "version": "13.1-33.52"},
{"vhash": "9bf6d5d3131495969deba0f850447947", "version": "13.1-33.54"},
{"vhash": "3bd7940b6425d9d4dba7e8b656d4ba65", "version": "13.0-88.16"},
{"vhash": "0d656200c32bb47c300b81e599260c42", "version": "13.1-37.38"},
{"vhash": "953fae977d4baedf39e83c9d1e134ef1", "version": "12.1-55.291"},
{"vhash": "f063b04477adc652c6dd502ac0c39a75", "version": "12.1-65.25"}
]
CITRIX_ICON_LOCATIONS = [
"/receiver/images/common/icon_vpn.ico",
"/vpn/images/AccessGateway.ico",
]
def check_pluginlist_xml(url):
parsed_url = urlparse(url)
site = f"{parsed_url.scheme}://{parsed_url.netloc}"
logging.info(f"Making request to {site} to determine XML version")
response = requests.get(f"{site}/vpn/pluginlist.xml", verify=False, allow_redirects=False, timeout=MAX_RETRIES)
# check if request was successful
if response.status_code == 200:
root = ET.fromstring(response.content)
# find the plugin
for repository in root.findall('repository'):
for plugin in repository.findall('plugin'):
name = plugin.get('name')
version = plugin.get('version')
# check if this is the plugin we are interested in
if name == "Netscaler Gateway EPA plug-in for Windows (32 bit)":
# extract the major version
major_version = int(version.split(".")[0])
minor_version = int(version.split(".")[1])
if major_version < 22:
logging.info(f"{site} - Matched Version: {version}")
return "VULNERABLE"
if major_version >= 23:
if minor_version >= 5:
logging.info(f"{site} - Matched Version: {version}")
return "PATCHED"
else:
logging.info(f"{site} - Version does not match: {version}")
else:
logging.info(f"{site} - Failed to fetch XML")
def is_site_compromised(url):
parsed_url = urlparse(url)
site = f"{parsed_url.scheme}://{parsed_url.netloc}"
for ioc in POTENTIALLY_COMPROMISED_FILES:
try:
webshell_path = site + "/vpn/themes/" + ioc
logging.info(f"Making request to {webshell_path} to determine if compromised")
response = requests.get(webshell_path, verify=False, allow_redirects=False, timeout=MAX_RETRIES)
except requests.exceptions.RequestException as e:
logging.error(f"An error occurred while trying to connect to {webshell_path}. Error: {e}")
return
if response.status_code == 200:
print(f"{webshell_path} - [COMPROMISE DETECTED]")
logging.info(f"{webshell_path} is potentially compromised! Evidence of web shell observed!")
elif response.status_code != 404:
logging.info(f"{webshell_path} - Benign Result: {response.text}")
def is_site_vulnerable(url):
try:
logging.info(f"Making request to {url}")
response = requests.get(url, verify=False, timeout=MAX_RETRIES)
except requests.exceptions.RequestException as e:
logging.error(f"An error occurred while trying to connect to {url}. Error: {e}")
print(f"{url} - [UNREACHABLE]")
return
html_content = response.text
soup = BeautifulSoup(html_content, 'html.parser')
# Initialize checks
title_check = False
comment_check = False
icon_check = False
hash_exists = False
hash_check = False
identified_version = None
patched = False
header_check = False
xml_check = False
# Check if Response Headers matches CERT UK Research (aka Patched version)
last_modified = datetime.datetime.strptime(response.headers["Last-Modified"], "%a, %d %b %Y %H:%M:%S %Z")
for patch in PATCHED_VERSIONS:
if last_modified == datetime.datetime.strptime(patch["timestamp"], "%a, %d %b %Y %H:%M:%S %Z"):
logging.info(f"{url} - Patch Check Passed. Not Vulnerable")
patched = True
identified_version = patch["version"]
elif not patched and last_modified < datetime.datetime.strptime("01 Jul 2023 00:00:00 GMT", "%d %b %Y %H:%M:%S %Z"):
header_check = True
logging.info(f"{url} - Header Check Complete. potentially vulnerable (older than 01 Jul 2023)")
elif not patched and "Jul 2023" in response.headers["Last-Modified"]:
header_check = True
logging.info(f"{url} - Header Check Complete. Most Likely Patched (newer than 01 Jul 2023)")
identified_version = None
patched = True
# Check if the title is "Citrix" related
if soup.title.string in ["Citrix Gateway", "NetScaler AAA", "Digital Workplace", "NetScaler Gateway"]:
title_check = True
logging.info(f"{url} - Title Check Passed")
# Check for "frame-busting" HTML comment
if "frame-busting" in html_content:
comment_check = True
logging.info(f"{url} - HTML comment check Passed")
# Check for icon
icon_check = "/vpn/images/AccessGateway.ico" in html_content or "receiver/images/common/icon_vpn.ico" in html_content
for icon in CITRIX_ICON_LOCATIONS:
if icon in html_content:
icon_check = True
logging.info(f"{url} - Icon check Passed")
# Check if ANY hash is identified in HTML content - signifies older version as this was fixed in new releases
pattern = r'v=[a-fA-F0-9]{32}'
# Search for the pattern in the text
match = re.search(pattern, html_content)
# If a match is found
if match and not patched:
hash_exists = True
logging.info(f"{url} - Hash found")
# Check for the presence of identified hashes in the HTML content
for hash_version in hash_versions:
if hash_version["vhash"] in html_content:
hash_check = True
identified_version = hash_version["version"]
logging.info(f"{url} - Version check Passed")
break
else:
logging.info(f"{url} - Hash check Not Found")
# VPN Pluginlist XML Check
xml_check = check_pluginlist_xml(url)
if xml_check:
if xml_check == "PATCHED":
patched = True
# Decision making based on the checks
status = ''
message = ''
if patched:
status = '[PATCHED]'
if identified_version:
message = f"[CERTAIN] [{identified_version}]"
else:
message = f"[FIRM]"
elif (hash_check or title_check and comment_check and icon_check and hash_exists and header_check) and not patched:
status = '[VULNERABLE]'
if hash_check:
message = f"[CERTAIN] [{identified_version}]"
else:
message = f"[FIRM]"
elif (title_check and icon_check and xml_check) and not patched:
status = '[VULNERABLE]'
message = f"[TENTATIVE]"
elif title_check and icon_check and not patched:
status = '[CITRIX DETECTED]'
else:
message = f"[CITRIX NOT DETECTED]"
if status == '[PATCHED]':
logging.info(f"{url} - {status} {message}")
elif status == '[VULNERABLE]':
logging.warning(f"{url} - {status} {message}")
else:
logging.info(f"{url} - {message}")
print(f"{url} - {status} {message}")
def process_urls(urls, iocs):
print(f"Checking list if vulnerable to CVE-2023-3519")
if iocs:
print(f"Checking list if compromised by CVE-2023-3519 (Be patient!)")
for url in urls:
if iocs:
is_site_compromised(url.strip())
is_site_vulnerable(url.strip())
def main():
# Display the banner
print("""
Author: Bryan Smith (@securekomodo)
------------------------
_________ .__ __ .__
\_ ___ \|__|/ |________|__|__ ___
/ \ \/| \ __\_ __ \ \ \/ /
\ \___| || | | | \/ |> <
\______ /__||__| |__| |__/__/\_ \
\/ \/
.___ __
| | ____ ____________ ____ _____/ |_ ___________
| |/ \ / ___/\____ \_/ __ \_/ ___\ __\/ _ \_ __ \\
| | | \\___ \ | |_> > ___/\ \___| | ( <_> ) | \/
|___|___| /____ >| __/ \___ >\___ >__| \____/|__|
\/ \/ |__| \/ \/
CVE-2023-3519 Inspector
------------------------
""")
parser = argparse.ArgumentParser(description="Check for vulnerabilities in Citrix Gateway.")
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('-u', '--url', help="The URL of the Citrix Gateway to check.")
group.add_argument('-f', '--file', help="A file containing a list of URLs to check.")
parser.add_argument('--ioc-check', action='store_true', help='Slower. Performs IOC (Indicator of Compromise) check.')
parser.add_argument('-l', '--log', default='cve_2023_3519_inspector.log', help="Log file to write the output.")
args = parser.parse_args()
logging.basicConfig(filename=args.log, filemode='w', format='%(message)s', level=logging.INFO)
if args.url:
timestamp = datetime.datetime.now()
logging.info(f"Scan started: {timestamp}")
print(f"Scan started: {timestamp}")
print(f"{args.url} - Checking if vulnerable to CVE-2023-3519")
if args.ioc_check:
print(f"{args.url} - Checking if compromised by CVE-2023-3519 (Be patient!)")
is_site_compromised(args.url)
is_site_vulnerable(args.url)
timestamp = datetime.datetime.now()
logging.info(f"Scan Complete: {timestamp}")
print(f"Scan Complete: {timestamp}")
else:
timestamp = datetime.datetime.now()
logging.info(f"Scan started: {timestamp}")
print(f"Scan started: {timestamp}")
with open(args.file, 'r') as file:
if args.ioc_check:
process_urls(file.readlines(), True)
else:
process_urls(file.readlines(), False)
timestamp = datetime.datetime.now()
logging.info(f"Scan Complete: {timestamp}")
print(f"Scan Complete: {timestamp}")
if __name__ == "__main__":
main()