Nmap rdp-ntlm-info NSE Script


This page contains detailed information about how to use the rdp-ntlm-info NSE script. For list of all NSE scripts, visit the Nmap NSE Library.

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Overview
Error Messages

Script Overview

Script source code: https://github.com/nmap/nmap/tree/master/scripts/rdp-ntlm-info.nse
Script categories: default, discovery, safe
Target service / protocol: ms-wbt-server
Target network port(s): 3389
List of CVEs: -

Script Description

The rdp-ntlm-info.nse script enumerates information from remote RDP services with CredSSP (NLA) authentication enabled.

Sending an incomplete CredSSP (NTLM) authentication request with null credentials will cause the remote service to respond with a NTLMSSP message disclosing information to include NetBIOS, DNS, and OS build version.

Rdp-ntlm-info NSE Script Arguments

This is a full list of arguments supported by the rdp-ntlm-info.nse script:

smbdomain

The domain to log in with. If you aren't in a domain environment, then anything will (should?) be accepted by the server.

smbhash

A password hash to use when logging in. This is given as a single hex string (32 characters) or a pair of hex strings (both 32 characters, optionally separated by a single character). These hashes are the LanMan or NTLM hash of the user's password, and are stored on disk or in memory. They can be retrieved from memory using the fgdump or pwdump tools.

smbnoguest

Use to disable usage of the 'guest' account.

smbpassword

The password to connect with. Be cautious with this, since some servers will lock accounts if the incorrect password is given. Although it's rare that the Administrator account can be locked out, in the off chance that it can, you could get yourself in trouble. To use a blank password, leave this parameter off altogether.

smbtype

The type of SMB authentication to use. These are the possible options:

  • v1: Sends LMv1 and NTLMv1.
  • LMv1: Sends LMv1 only.
  • NTLMv1: Sends NTLMv1 only (default).
  • v2: Sends LMv2 and NTLMv2.
  • LMv2: Sends LMv2 only.
  • NTLMv2: Doesn't exist; the protocol doesn't support NTLMv2 alone. The default, NTLMv1, is a pretty decent compromise between security and compatibility. If you are paranoid, you might want to use v2 or lmv2 for this. (Actually, if you're paranoid, you should be avoiding this protocol altogether!). If you're using an extremely old system, you might need to set this to v1 or lm, which are less secure but more compatible. For information, see smbauth.lua.

smbusername

The SMB username to log in with. The forms "DOMAIN\username" and "username@DOMAIN" are not understood. To set a domain, use the smbdomain argument.

- - -
To use these script arguments, add them to the Nmap command line using the --script-args arg1=value,[arg2=value,..] syntax. For example:

nmap --script=rdp-ntlm-info --script-args smbdomain=value,smbhash=value <target>

Rdp-ntlm-info NSE Script Example Usage

Here's an example of how to use the rdp-ntlm-info.nse script:

nmap -p 3389 --script rdp-ntlm-info <target>

Rdp-ntlm-info NSE Script Example Output

Here's a sample output from the rdp-ntlm-info.nse script:

3389/tcp open     ms-wbt-server syn-ack ttl 128 Microsoft Terminal Services
| rdp-ntlm-info:
|   Target_Name: W2016
|   NetBIOS_Domain_Name: W2016
|   NetBIOS_Computer_Name: W16GA-SRV01
|   DNS_Domain_Name: W2016.lab
|   DNS_Computer_Name: W16GA-SRV01.W2016.lab
|   DNS_Tree_Name: W2016.lab
|   Product_Version: 10.0.14393
|_  System_Time: 2019-06-13T10:38:35+00:00

Rdp-ntlm-info NSE Script Example XML Output

Here's a sample XML output from the rdp-ntlm-info.nse script produced by providing the -oX <file> Nmap option:

 <elem key="Target_Name">W2016</elem>
 <elem key="NetBIOS_Domain_Name">W2016</elem>
 <elem key="NetBIOS_Computer_Name">W16GA-SRV01</elem>
 <elem key="DNS_Domain_Name">W2016.lab</elem>
 <elem key="DNS_Computer_Name">W16GA-SRV01.W2016.lab</elem>
 <elem key="DNS_Tree_Name">W2016.lab</elem>
 <elem key="Product_Version">10.0.14393</elem>
 <elem key="System_Time">2019-06-13T10:38:35+00:00</elem>

Author

  • Tom Sellers

References

See Also

Related NSE scripts to the rdp-ntlm-info.nse script:

Visit Nmap NSE Library for more scripts.

The rdp-ntlm-info.nse script may fail with the following error messages. Check for the possible causes by using the code snippets highlighted below found in the script source code. This can often times help in identifying the root cause of the problem.

Unable to establish a TLS connection which is required to negotiation CredSSP.

Here is a relevant code snippet related to the "Unable to establish a TLS connection which is required to negotiation CredSSP." error message:

105:	    if status then
106:	      recvtime = os.time()
107:	    end
108:	  else
109:	    comm:close()
110:	    stdnse.debug1("Unable to establish a TLS connection which is required to negotiation CredSSP.")
111:	    return
112:	  end
113:	
114:	  if response == nil then
115:	    return

Version

This page has been created based on Nmap version 7.92.

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