Nmap smb-mbenum NSE Script


This page contains detailed information about how to use the smb-mbenum 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/smb-mbenum.nse
Script categories: discovery, safe
Target service / protocol: smb, netbios, tcp, udp
Target network port(s): 137, 139, 445
List of CVEs: -

Script Description

The smb-mbenum.nse script queries information managed by the Windows Master Browser.

Smb-mbenum NSE Script Arguments

This is a full list of arguments supported by the smb-mbenum.nse script:

smb-mbenum.domain

(optional) if not specified, lists the domain of the queried browser

smb-mbenum.filter

(optional) if set, queries the browser for a specific type of server (@see ServerTypes)

smb-mbenum.format

(optional) if set, changes the format of the result returned by the script. There are three possible formats: 1. Ordered by type horizontally 2. Ordered by type vertically 3. Ordered by type vertically with details (default)

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.

randomseed

Set to a value to change the filenames/service names that are randomly generated.

smbbasic

Forces the authentication to use basic security, as opposed to "extended security". Against most modern systems, extended security should work, but there may be cases where you want to force basic. There's a chance that you'll get better results for enumerating users if you turn on basic authentication.

smbport

Override the default port choice. If smbport is open, it's used. It's assumed to be the same protocol as port 445, not port 139. Since it probably isn't possible to change Windows' ports normally, this is mostly useful if you're bouncing through a relay or something.

smbsign

Controls whether or not server signatures are checked in SMB packets. By default, on Windows, server signatures aren't enabled or required. By default, this library will always sign packets if it knows how, and will check signatures if the server says to. Possible values are:

  • force: Always check server signatures, even if server says it doesn't support them (will Probably fail, but is technically more secure).
  • negotiate: [default] Use signatures if server supports them.
  • ignore: Never check server signatures. Not recommended.
  • disable: Don't send signatures, at all, and don't check the server's. not recommended. More information on signatures can be found in smbauth.lua.

- - -
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=smb-mbenum --script-args smb-mbenum.domain=value,smb-mbenum.filter=value <target>

Smb-mbenum NSE Script Example Usage

Here's an example of how to use the smb-mbenum.nse script:

nmap -p 445 <host> --script smb-mbenum

Smb-mbenum NSE Script Example Output

Here's a sample output from the smb-mbenum.nse script:

| smb-mbenum:
|   Backup Browser
|     WIN2K3-EPI-1  5.2  EPiServer 2003 frontend server
|   DFS Root
|     WIN2K3-1      5.2  MSSQL Server backend
|     WIN2K3-EPI-1  5.2  EPiServer 2003 frontend server
|   Master Browser
|     WIN2K3-EPI-1  5.2  EPiServer 2003 frontend server
|   SQL Server
|     WIN2K3-EPI-1  5.2  EPiServer 2003 frontend server
|   Server
|     TIME-CAPSULE  4.32  Time Capsule
|     WIN2K3-1      5.2   MSSQL Server backend
|     WIN2K3-EPI-1  5.2   EPiServer 2003 frontend server
|   Server service
|     TIME-CAPSULE  4.32  Time Capsule
|     WIN2K3-1      5.2   MSSQL Server backend
|     WIN2K3-EPI-1  5.2   EPiServer 2003 frontend server
|   Windows NT/2000/XP/2003 server
|     TIME-CAPSULE  4.32  Time Capsule
|     WIN2K3-1      5.2   MSSQL Server backend
|     WIN2K3-EPI-1  5.2   EPiServer 2003 frontend server
|   Workstation
|     TIME-CAPSULE  4.32  Time Capsule
|     WIN2K3-1      5.2   MSSQL Server backend
|_    WIN2K3-EPI-1  5.2   EPiServer 2003 frontend server

Smb-mbenum NSE Script Example XML Output

There is no sample XML output for this module. However, by providing the -oX <file> option, Nmap will produce a XML output and save it in the file.xml file.

Author

  • Patrik Karlsson

References

See Also

Related NSE scripts to the smb-mbenum.nse script:

Visit Nmap NSE Library for more scripts.

The smb-mbenum.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.

n The argument smb-mbenum.filter contained an invalid value.

Here is a relevant code snippet related to the "n The argument smb-mbenum.filter contained an invalid value." error message:

143:	
144:	  filter = tonumber(filter) or ServerTypes[filter]
145:	  format = tonumber(format)
146:	
147:	  if ( not(filter) ) then
148:	    return "\n The argument smb-mbenum.filter contained an invalid value."
149:	  end
150:	
151:	  if ( not(format) ) then
152:	    return "\n  The argument smb-mbenum.format contained an invalid value."
153:	  end

n The argument smb-mbenum.format contained an invalid value.

Here is a relevant code snippet related to the "n The argument smb-mbenum.format contained an invalid value." error message:

147:	  if ( not(filter) ) then
148:	    return "\n The argument smb-mbenum.filter contained an invalid value."
149:	  end
150:	
151:	  if ( not(format) ) then
152:	    return "\n  The argument smb-mbenum.format contained an invalid value."
153:	  end
154:	
155:	  local errstr = nil
156:	  status, err = smb.negotiate_protocol(smbstate, {})
157:	  if ( not(status) ) then

ERROR: smb.negotiate_protocol failed

Here is a relevant code snippet related to the "ERROR: smb.negotiate_protocol failed" error message:

153:	  end
154:	
155:	  local errstr = nil
156:	  status, err = smb.negotiate_protocol(smbstate, {})
157:	  if ( not(status) ) then
158:	    log("ERROR: smb.negotiate_protocol failed")
159:	    errstr = "\n  ERROR: Failed to connect to browser service: " .. err
160:	  else
161:	
162:	    status, err = smb.start_session(smbstate, {})
163:	    if ( not(status) ) then

n ERROR: Failed to connect to browser service:

Here is a relevant code snippet related to the "n ERROR: Failed to connect to browser service: " error message:

154:	
155:	  local errstr = nil
156:	  status, err = smb.negotiate_protocol(smbstate, {})
157:	  if ( not(status) ) then
158:	    log("ERROR: smb.negotiate_protocol failed")
159:	    errstr = "\n  ERROR: Failed to connect to browser service: " .. err
160:	  else
161:	
162:	    status, err = smb.start_session(smbstate, {})
163:	    if ( not(status) ) then
164:	      log("ERROR: smb.start_session failed")

ERROR: smb.start_session failed

Here is a relevant code snippet related to the "ERROR: smb.start_session failed" error message:

159:	    errstr = "\n  ERROR: Failed to connect to browser service: " .. err
160:	  else
161:	
162:	    status, err = smb.start_session(smbstate, {})
163:	    if ( not(status) ) then
164:	      log("ERROR: smb.start_session failed")
165:	      errstr = "\n  ERROR: Failed to connect to browser service: " .. err
166:	    else
167:	
168:	      status, err = smb.tree_connect(smbstate, path, {})
169:	      if ( not(status) ) then

n ERROR: Failed to connect to browser service:

Here is a relevant code snippet related to the "n ERROR: Failed to connect to browser service: " error message:

160:	  else
161:	
162:	    status, err = smb.start_session(smbstate, {})
163:	    if ( not(status) ) then
164:	      log("ERROR: smb.start_session failed")
165:	      errstr = "\n  ERROR: Failed to connect to browser service: " .. err
166:	    else
167:	
168:	      status, err = smb.tree_connect(smbstate, path, {})
169:	      if ( not(status) ) then
170:	        log("ERROR: smb.tree_connect failed")

ERROR: smb.tree_connect failed

Here is a relevant code snippet related to the "ERROR: smb.tree_connect failed" error message:

165:	      errstr = "\n  ERROR: Failed to connect to browser service: " .. err
166:	    else
167:	
168:	      status, err = smb.tree_connect(smbstate, path, {})
169:	      if ( not(status) ) then
170:	        log("ERROR: smb.tree_connect failed")
171:	        errstr = "\n  ERROR: Failed to connect to browser service: " .. err
172:	      else
173:	
174:	        status, entries = msrpc.rap_netserverenum2(smbstate, domain, filter, detail_level)
175:	        if ( not(status) ) then

n ERROR: Failed to connect to browser service:

Here is a relevant code snippet related to the "n ERROR: Failed to connect to browser service: " error message:

166:	    else
167:	
168:	      status, err = smb.tree_connect(smbstate, path, {})
169:	      if ( not(status) ) then
170:	        log("ERROR: smb.tree_connect failed")
171:	        errstr = "\n  ERROR: Failed to connect to browser service: " .. err
172:	      else
173:	
174:	        status, entries = msrpc.rap_netserverenum2(smbstate, domain, filter, detail_level)
175:	        if ( not(status) ) then
176:	          log("ERROR: msrpc.rap_netserverenum2 failed")

ERROR: msrpc.rap_netserverenum2 failed

Here is a relevant code snippet related to the "ERROR: msrpc.rap_netserverenum2 failed" error message:

171:	        errstr = "\n  ERROR: Failed to connect to browser service: " .. err
172:	      else
173:	
174:	        status, entries = msrpc.rap_netserverenum2(smbstate, domain, filter, detail_level)
175:	        if ( not(status) ) then
176:	          log("ERROR: msrpc.rap_netserverenum2 failed")
177:	          -- 71 == 0x00000047, ERROR_REQ_NOT_ACCEP
178:	          -- http://msdn.microsoft.com/en-us/library/cc224501.aspx
179:	          if entries:match("= 71$") then
180:	            errstr = "Not a master or backup browser"
181:	          else

n ERROR:

Here is a relevant code snippet related to the "n ERROR: " error message:

177:	          -- 71 == 0x00000047, ERROR_REQ_NOT_ACCEP
178:	          -- http://msdn.microsoft.com/en-us/library/cc224501.aspx
179:	          if entries:match("= 71$") then
180:	            errstr = "Not a master or backup browser"
181:	          else
182:	            errstr = "\n  ERROR: " .. entries
183:	          end
184:	        end
185:	      end
186:	
187:	      status, err = smb.tree_disconnect(smbstate)

ERROR: smb.tree_disconnect failed

Here is a relevant code snippet related to the "ERROR: smb.tree_disconnect failed" error message:

183:	          end
184:	        end
185:	      end
186:	
187:	      status, err = smb.tree_disconnect(smbstate)
188:	      if ( not(status) ) then log("ERROR: smb.tree_disconnect failed") end
189:	    end
190:	
191:	    status, err = smb.logoff(smbstate)
192:	    if ( not(status) ) then log("ERROR: smb.logoff failed") end
193:	  end

ERROR: smb.logoff failed

Here is a relevant code snippet related to the "ERROR: smb.logoff failed" error message:

187:	      status, err = smb.tree_disconnect(smbstate)
188:	      if ( not(status) ) then log("ERROR: smb.tree_disconnect failed") end
189:	    end
190:	
191:	    status, err = smb.logoff(smbstate)
192:	    if ( not(status) ) then log("ERROR: smb.logoff failed") end
193:	  end
194:	
195:	  status, err = smb.stop(smbstate)
196:	  if ( not(status) ) then log("ERROR: smb.stop failed") end
197:

ERROR: smb.stop failed

Here is a relevant code snippet related to the "ERROR: smb.stop failed" error message:

191:	    status, err = smb.logoff(smbstate)
192:	    if ( not(status) ) then log("ERROR: smb.logoff failed") end
193:	  end
194:	
195:	  status, err = smb.stop(smbstate)
196:	  if ( not(status) ) then log("ERROR: smb.stop failed") end
197:	
198:	  if errstr then
199:	    return errstr
200:	  end
201:

Version

This page has been created based on Nmap version 7.92.

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