Nmap telnet-ntlm-info NSE Script


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

Script Overview

Script source code: https://github.com/nmap/nmap/tree/master/scripts/telnet-ntlm-info.nse
Script categories: default, discovery, safe
Target service / protocol: telnet
Target network port(s): 23
List of CVEs: -

Script Description

The telnet-ntlm-info.nse script enumerates information from remote Microsoft Telnet services with NTLM authentication enabled.

Sending a MS-TNAP 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.

Telnet-ntlm-info NSE Script Arguments

This is a full list of arguments supported by the telnet-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=telnet-ntlm-info --script-args smbdomain=value,smbhash=value <target>

Telnet-ntlm-info NSE Script Example Usage

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

nmap -p 23 --script telnet-ntlm-info <target>

Telnet-ntlm-info NSE Script Example Output

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

23/tcp   open     telnet
| telnet-ntlm-info:
|   Target_Name: ACTIVETELNET
|   NetBIOS_Domain_Name: ACTIVETELNET
|   NetBIOS_Computer_Name: HOST-TEST2
|   DNS_Domain_Name: somedomain.com
|   DNS_Computer_Name: host-test2.somedomain.com
|   DNS_Tree_Name: somedomain.com
|_  Product_Version: 5.1.2600

Telnet-ntlm-info NSE Script Example XML Output

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

 <elem key="Target_Name">ACTIVETELNET</elem>
 <elem key="NetBIOS_Domain_Name">ACTIVETELNET</elem>
 <elem key="NetBIOS_Computer_Name">HOST-TEST2</elem>
 <elem key="DNS_Domain_Name">somedomain.com</elem>
 <elem key="DNS_Computer_Name">host-test2.somedomain.com</elem>
 <elem key="DNS_Tree_Name">somedomain.com</elem>
 <elem key="Product_Version">5.1.2600</elem>

Author

  • Justin Cacak

References

See Also

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

Visit Nmap NSE Library for more scripts.

Version

This page has been created based on Nmap version 7.92.