gmh5225 / wspcoerce

PoC to coerce authentication from Windows hosts using MS-WSP

WSPCoerce

PoC to coerce authentication from Windows hosts using MS-WSP

What is this?

It's a tool to interact with remote hosts using the Windows Search Protocol and coerce authentication. The target host will connect over SMB to the listener host using the machine account.

What can I do with this?

• Relay the authentication from the target to another system (if SMB signing is disabled)
• Obtain the TGT of the target (if coercing to a system where unconstrained delegation is enabled)

What are the requirements?

• Must be running in the context of a domain user (no specific privileges required on target system AFAIK)
• 445/TCP open on the target system
• 445/TCP open on the listener system
• Windows Search Service running on the target system

Note: The Windows Search Service is NOT enabled by default on Windows Server so in practice this attack is only effective against Windows workstations.

How do I compile this?

c:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe WSPCoerce.cs

How do I run this?

WSPCoerce.exe <target> <listener>

Notes:

• Can't use an IP address for the target
• Make sure to use a hostname or FQDN for the listener if you want to receive Kerberos auth

Example demo 1 - Machine account NTLMv2 capture

• Target: LABWS1
• Listener: Kali box

Search request sent to LABWS1:

NTLMv2 captured on Responder:

Example demo 2 - Coercion to unconstrained delegation

• Target: LABWS1
• Listener: LABSRV1

Search request sent to LABWS1:

Kerberos TGT on listener (LABSRV1):