Nmap vmauthd-brute NSE Script


This page contains detailed information about how to use the vmauthd-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/vmauthd-brute.nse
Script categories: brute, intrusive
Target service / protocol: ssl/vmware-auth, vmware-auth, tcp
Target network port(s): 902
List of CVEs: -

Script Description

The vmauthd-brute.nse script performs brute force password auditing against the VMWare Authentication Daemon (vmware-authd).

Vmauthd-brute NSE Script Arguments

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

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

- - -
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=vmauthd-brute --script-args creds.global=value,creds.\[service]=value <target>

Vmauthd-brute NSE Script Example Usage

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

nmap -p 902 <ip> --script vmauthd-brute

Vmauthd-brute NSE Script Example Output

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

PORT    STATE SERVICE
902/tcp open  iss-realsecure
| vmauthd-brute:
|   Accounts
|     root:00000 - Valid credentials
|   Statistics
|_    Performed 183 guesses in 40 seconds, average tps: 4

Vmauthd-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

Visit Nmap NSE Library for more scripts.

The vmauthd-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.

Failed to send data to server

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

51:	      self.socket:reconnect_ssl()
52:	    end
53:	
54:	    status = self.socket:send( ("USER %s\r\n"):format(username) )
55:	    if ( not(status) ) then
56:	      local err = brute.Error:new( "Failed to send data to server" )
57:	      err:setRetry( true )
58:	      return false, err
59:	    end
60:	
61:	    local status, response = self.socket:receive_buf(match.pattern_limit("\r\n", 2048), false)

Received unexpected response from server

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

58:	      return false, err
59:	    end
60:	
61:	    local status, response = self.socket:receive_buf(match.pattern_limit("\r\n", 2048), false)
62:	    if ( not(status) or not(response:match("^331") ) ) then
63:	      local err = brute.Error:new( "Received unexpected response from server" )
64:	      err:setRetry( true )
65:	      return false, err
66:	    end
67:	
68:	    status = self.socket:send( ("PASS %s\r\n"):format(password) )

Failed to send data to server

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

65:	      return false, err
66:	    end
67:	
68:	    status = self.socket:send( ("PASS %s\r\n"):format(password) )
69:	    if ( not(status) ) then
70:	      local err = brute.Error:new( "Failed to send data to server" )
71:	      err:setRetry( true )
72:	      return false, err
73:	    end
74:	    status, response = self.socket:receive_buf(match.pattern_limit("\r\n", 2048), false)
75:

Login incorrect

Here is a relevant code snippet related to the "Login incorrect" error message:

75:	
76:	    if ( response:match("^230") ) then
77:	      return true, creds.Account:new(username, password, creds.State.VALID)
78:	    end
79:	
80:	    return false, brute.Error:new( "Login incorrect" )
81:	  end,
82:	
83:	  disconnect = function(self)
84:	    return self.socket:close()
85:	  end

Failed to connect to server

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

89:	local function checkAuthd(host, port)
90:	  local socket = nmap.new_socket()
91:	  local status = socket:connect(host, port)
92:	
93:	  if( not(status) ) then
94:	    return false, "Failed to connect to server"
95:	  end
96:	
97:	  local status, line = socket:receive_buf(match.pattern_limit("\r\n", 2048), false)
98:	  socket:close()
99:	  if ( not(status) ) then

Failed to receive response from server

Here is a relevant code snippet related to the "Failed to receive response from server" error message:

95:	  end
96:	
97:	  local status, line = socket:receive_buf(match.pattern_limit("\r\n", 2048), false)
98:	  socket:close()
99:	  if ( not(status) ) then
100:	    return false, "Failed to receive response from server"
101:	  end
102:	
103:	  if ( not( line:match("^220 VMware Authentication Daemon") ) ) then
104:	    return false, "Failed to detect VMWare Authentication Daemon"
105:	  end

Failed to detect VMWare Authentication Daemon

Here is a relevant code snippet related to the "Failed to detect VMWare Authentication Daemon" error message:

99:	  if ( not(status) ) then
100:	    return false, "Failed to receive response from server"
101:	  end
102:	
103:	  if ( not( line:match("^220 VMware Authentication Daemon") ) ) then
104:	    return false, "Failed to detect VMWare Authentication Daemon"
105:	  end
106:	  return true
107:	end
108:	
109:

Version

This page has been created based on Nmap version 7.92.

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