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25. Powershell Remoting Part 6

The Double Hop Problem

Image of Hop

  • Target 1 - Windows Client - Part of a Domain

  • Target 2 - Windows Server - Domain Controller

  • On Attacker

PS C:\Windows\system32> Enable-WSManCredSSP -Role Client -DelegateComputer *

CredSSP Authentication Configuration for WS-Management
CredSSP authentication allows the user credentials on this computer to be sent to a remote computer. If you use CredSSP
 authentication for a connection to a malicious or compromised computer, that computer will have access to your user
name and password. For more information, see the Enable-WSManCredSSP Help topic.
Do you want to enable CredSSP authentication?
[Y] Yes  [N] No  [S] Suspend  [?] Help (default is "Y"): Y

cfg         : http://schemas.microsoft.com/wbem/wsman/1/config/client/auth
lang        : en-US
Basic       : true
Digest      : true
Kerberos    : true
Negotiate   : true
Certificate : true
CredSSP     : true

PS C:\Windows\system32> 
PS C:\Windows\system32> Get-WSManCredSSP
The machine is configured to allow delegating fresh credentials to the following target(s): wsman/*
This computer is not configured to receive credentials from a remote client computer.
PS C:\Windows\system32>
  • Enter-PSSession from Attacker machine on Target 1
PS C:\Users\Windows7-64> Enter-PSSession -ComputerName JOHN-PC -Credential PFPT\Administrator
[john-pc]: PS C:\Users\Administrator\Documents> whoami
pfpt\administrator
[john-pc]: PS C:\Users\Administrator\Documents> Enable-WSManCredSSP -Role Server
[john-pc]: PS C:\Users\Administrator\Documents> Get-WSManCredSSP
[john-pc]: PS C:\Users\Administrator\Documents> exit
  • Enter-PSSession from Attacker machine on Target 1 using Authentication as CredSSP
PS C:\Users\Windows7-64> Enter-PSSession -ComputerName JOHN-PC -Credential PFPT\Administrator -Authentication CredSSP
  • Access remote resources on the Domain Controller i.e. Target 2
PS C:\Users\Windows7-64> Enter-PSSession -ComputerName JOHN-PC -Credential PFPT\Administrator -Authentication CredSSP
[john-pc]: PS C:\Users\Administrator\Documents> ls \\pfpt\sysvol


    Directory: \\pfpt\sysvol


Mode                LastWriteTime     Length Name
----                -------------     ------ ----
d----          7/9/2017  12:59 PM            pfpt.com


PS C:\Users\Administrator>
ADIS Type Accelerators
  • ADSI

Active Directory Service Interfaces is a set of COM interfaces used to access the features of directory services from different network providers.

  • Query the members of Domain Admin group
([ADSI]"LDAP://cn=Domain Admins,cn=Users,dc=<DOMAIN_NAME>,dc=Com").Member

PS C:\Users\Administrator> ([ADSI]"LDAP://cn=Domain Admins,cn=Users,dc=pfpt,dc=Com").Member
CN=Administrator,CN=Users,DC=pfpt,DC=com
PS C:\Users\Administrator>
  • Query the DC for a user to determine the groups he is a member of
([ADSI]"LDAP://cn=<USER>,cn=Users,dc=<DOMAIN_NAME>,dc=Com").MemberOf

PS C:\Users\Administrator> ([ADSI]"LDAP://cn=Administrator,cn=Users,dc=pfpt,dc=Com").MemberOf
CN=Group Policy Creator Owners,CN=Users,DC=pfpt,DC=com
CN=Domain Admins,CN=Users,DC=pfpt,DC=com
CN=Enterprise Admins,CN=Users,DC=pfpt,DC=com
CN=Schema Admins,CN=Users,DC=pfpt,DC=com
CN=Administrators,CN=Builtin,DC=pfpt,DC=com
PS C:\Users\Administrator>