Nmap membase-brute NSE Script


This page contains detailed information about how to use the membase-brute 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/membase-brute.nse
Script categories: intrusive, brute
Target service / protocol: couchbase-tap, tcp
Target network port(s): 11210, 11211
List of CVEs: -

Script Description

The membase-brute.nse script performs brute force password auditing against Couchbase Membase servers.

Membase-brute NSE Script Arguments

This is a full list of arguments supported by the membase-brute.nse script:

membase-brute.bucketname

If specified, password guessing is performed only against this bucket.

creds.global

Credentials to be returned by Credentials.getCredentials regardless of the service.

creds.[service]

Credentials to be returned by Credentials.getCredentials for [service]. E.g. creds.http=admin:password

passdb

The filename of an alternate password database. Default: nselib/data/passwords.lst

unpwdb.passlimit

The maximum number of passwords passwords will return (default unlimited).

unpwdb.timelimit

The maximum amount of time that any iterator will run before stopping. The value is in seconds by default and you can follow it with ms, s, m, or h for milliseconds, seconds, minutes, or hours. For example, unpwdb.timelimit=30m or unpwdb.timelimit=.5h for 30 minutes. The default depends on the timing template level (see the module description). Use the value 0 to disable the time limit.

unpwdb.userlimit

The maximum number of usernames usernames will return (default unlimited).

userdb

The filename of an alternate username database. Default: nselib/data/usernames.lst

brute.credfile

A file containing username and password pairs delimited by '/'

brute.delay

The number of seconds to wait between guesses (default: 0)

brute.emptypass

Guess an empty password for each user (default: false)

brute.firstonly

Stop guessing after first password is found (default: false)

brute.guesses

The number of guesses to perform against each account. (default: 0 (unlimited)). The argument can be used to prevent account lockouts.

brute.mode

Can be user, pass or creds and determines what mode to run the engine in.

  • user - the unpwdb library is used to guess passwords, every password Password is tried for each user. (The user iterator is in the outer loop)
  • pass - the unpwdb library is used to guess passwords, each password Is tried for every user. (The password iterator is in the outer loop)
  • creds - a set of credentials (username and password pairs) are Guessed against the service. This allows for lists of known or common username and password combinations to be tested. If no mode is specified and the script has not added any custom iterator the pass mode will be enabled.

brute.passonly

Iterate over passwords only for services that provide only a password for authentication. (default: false)

brute.retries

The number of times to retry if recoverable failures occur. (default: 2)

brute.start

The number of threads the engine will start with. (default: 5).

brute.threads

The number of initial worker threads, the number of active threads will be automatically adjusted.

brute.unique

Make sure that each password is only guessed once (default: true)

brute.useraspass

Guess the username as password for each user (default: true)

creds.[service]

Credentials to be returned by Credentials.getCredentials for [service]. E.g. creds.http=admin:password

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=membase-brute --script-args membase-brute.bucketname=value,creds.global=value <target>

Membase-brute NSE Script Example Usage

Here's an example of how to use the membase-brute.nse script:

nmap -p 11211 --script membase-brute

Membase-brute NSE Script Example Output

Here's a sample output from the membase-brute.nse script:

PORT      STATE SERVICE
11211/tcp open  unknown
| membase-brute:
|   Accounts
|     buckettest:toledo - Valid credentials
|   Statistics
|_    Performed 5000 guesses in 2 seconds, average tps: 2500

Membase-brute 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 membase-brute.nse script:

Visit Nmap NSE Library for more scripts.

The membase-brute.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.

Incorrect password

Here is a relevant code snippet related to the "Incorrect password" error message:

50:	  end,
51:	
52:	  login = function(self, username, password)
53:	    local status, response = self.helper:login(arg_bucketname or username, password)
54:	    if ( not(status) and "Auth failure" == response ) then
55:	      return false, brute.Error:new( "Incorrect password" )
56:	    elseif ( not(status) ) then
57:	      local err = brute.Error:new( response )
58:	      err:setRetry( true )
59:	      return false, err
60:	    end

Failed to connect to server

Here is a relevant code snippet related to the "Failed to connect to server" error message:

72:	
73:	local function getMechs(host, port)
74:	  local helper = membase.Helper:new(host, port)
75:	  local status, err = helper:connect()
76:	  if ( not(status) ) then
77:	    return false, "Failed to connect to server"
78:	  end
79:	
80:	  local status, response = helper:getSASLMechList()
81:	  if ( not(status) ) then
82:	    stdnse.debug2("Received unexpected response: %s", response)

Received unexpected response

Here is a relevant code snippet related to the "Received unexpected response" error message:

78:	  end
79:	
80:	  local status, response = helper:getSASLMechList()
81:	  if ( not(status) ) then
82:	    stdnse.debug2("Received unexpected response: %s", response)
83:	    return false, "Received unexpected response"
84:	  end
85:	
86:	  helper:close()
87:	  return true, response.mechs
88:	end

Unsupported SASL mechanism

Here is a relevant code snippet related to the "Unsupported SASL mechanism" error message:

93:	
94:	  if ( not(status) ) then
95:	    return fail(mechs)
96:	  end
97:	  if ( not(mechs:match("PLAIN") ) ) then
98:	    return fail("Unsupported SASL mechanism")
99:	  end
100:	
101:	  local result
102:	  local engine = brute.Engine:new(Driver, host, port )
103:

Version

This page has been created based on Nmap version 7.92.

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