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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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.hostlistThe filename of a list of node names to try. Defaults to "nselib/data/vhosts-default.lst"
nje-node-brute.ohostThe target mainframe OHOST. Used to bruteforce RHOST.
creds.globalCredentials 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
passdbThe filename of an alternate password database. Default: nselib/data/passwords.lst
unpwdb.passlimit
The maximum number of passwords passwords
will return (default unlimited).
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.
The maximum number of usernames usernames
will return (default unlimited).
The filename of an alternate username database. Default: nselib/data/usernames.lst
brute.credfileA file containing username and password pairs delimited by '/'
brute.delayThe number of seconds to wait between guesses (default: 0)
brute.emptypassGuess an empty password for each user (default: false)
brute.firstonlyStop guessing after first password is found (default: false)
brute.guessesThe number of guesses to perform against each account. (default: 0 (unlimited)). The argument can be used to prevent account lockouts.
brute.modeCan 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.
Iterate over passwords only for services that provide only a password for authentication. (default: false)
brute.retriesThe number of times to retry if recoverable failures occur. (default: 2)
brute.startThe number of threads the engine will start with. (default: 5).
brute.threadsThe number of initial worker threads, the number of active threads will be automatically adjusted.
brute.uniqueMake sure that each password is only guessed once (default: true)
brute.useraspassGuess 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
- https://nmap.org/nsedoc/scripts/nje-node-brute.html
- https://github.com/nmap/nmap/tree/master/scripts/nje-node-brute.nse
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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