Nmap backorifice-brute NSE Script

Script Overview

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Script source code: https://github.com/nmap/nmap/tree/master/scripts/backorifice-brute.nse
Script categories: intrusive, brute
Target service / protocol: udp
Target network port(s): 151-222, 1024-1512, 25252, 31337
List of CVEs: -

Script Description

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The backorifice-brute.nse script performs brute force password auditing against the BackOrifice service. The backorifice-brute.ports script argument is mandatory (it specifies ports to run the script against).

Backorifice-brute NSE Script Arguments

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

backorifice-brute.ports

(mandatory) List of UDP ports to run the script against separated with "," ex. "U:31337,25252,151-222", "U:1024-1512"

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=backorifice-brute --script-args backorifice-brute.ports=value,creds.global=value <target>

Backorifice-brute NSE Script Example Usage

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

nmap -sU --script backorifice-brute <host> --script-args backorifice-brute.ports=<ports>

Backorifice-brute NSE Script Example Output

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

PORT       STATE  SERVICE
31337/udp  open   BackOrifice
| backorifice-brute:
|   Accounts:
|     michael => Valid credentials
|   Statistics
|_    Perfomed 60023 guesses in 467 seconds, average tps: 138

Backorifice-brute NSE Script Example XML Output

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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

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• Gorjan Petrovski

References

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• https://nmap.org/nsedoc/scripts/backorifice-brute.html
• https://github.com/nmap/nmap/tree/master/scripts/backorifice-brute.nse

See Also

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Related NSE scripts to the backorifice-brute.nse script:

• backorifice-info.nse

Visit Nmap NSE Library for more scripts.

The backorifice-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.

Response not recognized.

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Here is a relevant code snippet related to the "Response not recognized." error message:

121:	      return true
122:	    else
123:	      if not(status) then
124:	        return false, response
125:	      else
126:	        return false,"Response not recognized."
127:	      end
128:	    end
129:	  end,
130:	
131:	  --- Close the socket

Incorrect password

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

266:	      end
267:	      table.insert( nmap.registry.credentials.backorifice, { password = password } )
268:	      return true, creds.Account:new("", password, creds.State.VALID)
269:	    else
270:	      -- The only indication that the password is incorrect is a timeout
271:	      local err = brute.Error:new( "Incorrect password" )
272:	      err:setRetry(false)
273:	      return false, err
274:	    end
275:	  end,
276: