Nmap nje-node-brute NSE Script


This page contains detailed information about how to use the nje-node-brute NSE script. For list of all NSE scripts, visit the Nmap NSE Library.

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Overview
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Script Overview


Script source code: https://github.com/nmap/nmap/tree/master/scripts/nje-node-brute.nse
Script categories: intrusive, brute
Target service / protocol: nje
Target network port(s): 175, 2252
List of CVEs: -

Script Description


z/OS JES Network Job Entry (NJE) target node name brute force.

NJE node communication is made up of an OHOST and an RHOST. Both fields must be present when conducting the handshake. This script attemtps to determine the target systems NJE node name.

To initiate NJE the client sends a 33 byte record containing the type of record, the hostname (RHOST), IP address (RIP), target (OHOST), target IP (OIP) and a 1 byte response value (R) as outlined below:

0 1 2 3 4 5 6 7 8 9 A B C D E F
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  TYPE       |     RHOST     |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  RIP  |  OHOST      | OIP   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| R |
+-+-+

  • TYPE: Can either be 'OPEN', 'ACK', or 'NAK', in EBCDIC, padded by spaces to make 8 bytes. This script always send 'OPEN' type.
  • RHOST: Node name of the local machine initiating the connection. Set to 'FAKE'.
  • RIP: Hex value of the local systems IP address. Set to '0.0.0.0'
  • OHOST: The value being enumerated to determine the targets NJE node name.
  • OIP: IP address, in hex, of the target system. Set to '0.0.0.0'.
  • R: The response. NJE will send an 'R' of 0x01 if the OHOST is wrong or 0x04 if the OHOST is correct.

By default this script will attempt the brute force a mainframes OHOST. If supplied with the argument nje-node-brute.ohost this script will attempt the bruteforce the RHOST, setting OHOST to the value supplied to the argument.

Since most systems will only have one OHOST name, it is recommended to use the brute.firstonly script argument.

Nje-node-brute NSE Script Arguments


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

nje-node-brute.hostlist

The filename of a list of node names to try. Defaults to "nselib/data/vhosts-default.lst"

nje-node-brute.ohost

The target mainframe OHOST. Used to bruteforce RHOST.

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=nje-node-brute --script-args nje-node-brute.hostlist=value,nje-node-brute.ohost=value <target>

Nje-node-brute NSE Script Example Usage


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

nmap -sV --script=nje-node-brute <target>

nmap --script=nje-node-brute --script-args=hostlist=nje_names.txt -p 175 <target>

Nje-node-brute NSE Script Example Output


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

PORT    STATE SERVICE REASON
175/tcp open  nje     syn-ack
| nje-node-brute:
|   Node Name:
|     POTATO:CACTUS - Valid credentials
|_  Statistics: Performed 6 guesses in 14 seconds, average tps: 0

Nje-node-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


  • Soldier of Fortran

References


See Also


Related NSE scripts to the nje-node-brute.nse script:

Visit Nmap NSE Library for more scripts.

The nje-node-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 connect


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

92:	
93:	  connect = function( self )
94:	    -- the high timeout should take delays into consideration
95:	    local s, r, opts, _ = comm.tryssl(self.host, self.port, '', { timeout = 50000 } )
96:	    if ( not(s) ) then
97:	      stdnse.debug2("Failed to connect")
98:	      return false, "Failed to connect to server"
99:	    end
100:	    self.socket = s
101:	    return true
102:	  end,

Failed to connect to server


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

93:	  connect = function( self )
94:	    -- the high timeout should take delays into consideration
95:	    local s, r, opts, _ = comm.tryssl(self.host, self.port, '', { timeout = 50000 } )
96:	    if ( not(s) ) then
97:	      stdnse.debug2("Failed to connect")
98:	      return false, "Failed to connect to server"
99:	    end
100:	    self.socket = s
101:	    return true
102:	  end,
103:	

ohost


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

110:	    password = string.upper(password)
111:	    stdnse.verbose(2,"Trying... %s", password)
112:	    local openNJE
113:	    if self.options['ohost'] then
114:	      -- One RHOST may have many valid OHOSTs
115:	      if password == self.options['ohost'] then return false, brute.Error:new( "RHOST cannot be OHOST" ) end
116:	      openNJE = openNJEfmt:format(drda.StringUtil.toEBCDIC(("%-8s"):format(password)),
117:	        drda.StringUtil.toEBCDIC(("%-8s"):format(self.options['ohost'])) )
118:	    else
119:	      openNJE = openNJEfmt:format(drda.StringUtil.toEBCDIC(("%-8s"):format('FAKE')),
120:	        drda.StringUtil.toEBCDIC(("%-8s"):format(password)) )

Failed to send


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

118:	    else
119:	      openNJE = openNJEfmt:format(drda.StringUtil.toEBCDIC(("%-8s"):format('FAKE')),
120:	        drda.StringUtil.toEBCDIC(("%-8s"):format(password)) )
121:	    end
122:	    local status, err = self.socket:send( openNJE )
123:	    if not status then return false, "Failed to send" end
124:	    local status, data = self.socket:receive_bytes(33)
125:	    if not status then return false, "Failed to receive" end
126:	    if ( not self.options['ohost'] and ( data:sub(-1) == "\x04" ) ) or
127:	       ( self.options['ohost'] and ( data:sub(-1) == "\0" ) ) then
128:	      -- stdnse.verbose(2,"Valid Node Name Found: %s", password)

Failed to receive


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

120:	        drda.StringUtil.toEBCDIC(("%-8s"):format(password)) )
121:	    end
122:	    local status, err = self.socket:send( openNJE )
123:	    if not status then return false, "Failed to send" end
124:	    local status, data = self.socket:receive_bytes(33)
125:	    if not status then return false, "Failed to receive" end
126:	    if ( not self.options['ohost'] and ( data:sub(-1) == "\x04" ) ) or
127:	       ( self.options['ohost'] and ( data:sub(-1) == "\0" ) ) then
128:	      -- stdnse.verbose(2,"Valid Node Name Found: %s", password)
129:	      return true, creds.Account:new((self.options['ohost'] or "Node Name"), password, creds.State.VALID)
130:	    end

Invalid Node Name


Here is a relevant code snippet related to the "Invalid Node Name" error message:

126:	    if ( not self.options['ohost'] and ( data:sub(-1) == "\x04" ) ) or
127:	       ( self.options['ohost'] and ( data:sub(-1) == "\0" ) ) then
128:	      -- stdnse.verbose(2,"Valid Node Name Found: %s", password)
129:	      return true, creds.Account:new((self.options['ohost'] or "Node Name"), password, creds.State.VALID)
130:	    end
131:	    return false, brute.Error:new( "Invalid Node Name" )
132:	  end,
133:	}
134:	
135:	-- Checks string to see if it follows node naming limitations
136:	local valid_name = function(x)

Version


This page has been created based on Nmap version 7.92.

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