Nmap iax2-brute NSE Script


This page contains detailed information about how to use the iax2-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/iax2-brute.nse
Script categories: intrusive, brute
Target service / protocol: iax2, udp, tcp
Target network port(s): 4569
List of CVEs: -

Script Description

The iax2-brute.nse script performs brute force password auditing against the Asterisk IAX2 protocol. Guessing fails when a large number of attempts is made due to the maxcallnumber limit (default 2048). In case your getting "ERROR: Too many retries, aborted ..." after a while, this is most likely what's happening. In order to avoid this problem try:

  • reducing the size of your dictionary
  • use the brute delay option to introduce a delay between guesses
  • split the guessing up in chunks and wait for a while between them

Iax2-brute NSE Script Arguments

This is a full list of arguments supported by the iax2-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=iax2-brute --script-args creds.global=value,creds.\[service]=value <target>

Iax2-brute NSE Script Example Usage

Here's an example of how to use the iax2-brute.nse script:

nmap -sU -p 4569 <ip> --script iax2-brute

Iax2-brute NSE Script Example Output

Here's a sample output from the iax2-brute.nse script:

PORT     STATE         SERVICE
4569/udp open|filtered unknown
| iax2-brute:
|   Accounts
|     1002:password12 - Valid credentials
|   Statistics
|_    Performed 1850 guesses in 2 seconds, average tps: 925

Iax2-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 iax2-brute.nse script:

Visit Nmap NSE Library for more scripts.

The iax2-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.

ERROR: Too many retries, aborted ...

Here is a relevant code snippet related to the "ERROR: Too many retries, aborted ..." error message:

4:	local shortport = require "shortport"
5:	
6:	description = [[
7:	Performs brute force password auditing against the Asterisk IAX2 protocol.
8:	Guessing fails when a large number of attempts is made due to the maxcallnumber limit (default 2048).
9:	In case your getting "ERROR: Too many retries, aborted ..." after a while, this is most likely what's happening.
10:	In order to avoid this problem try:
11:	  - reducing the size of your dictionary
12:	  - use the brute delay option to introduce a delay between guesses
13:	  - split the guessing up in chunks and wait for a while between them
14:	]]

Release failed

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

51:	
52:	  login = function(self, username, password)
53:	    local status, resp = self.helper:regRelease(username, password)
54:	    if ( status ) then
55:	      return true, creds.Account:new( username, password, creds.State.VALID )
56:	    elseif ( resp == "Release failed" ) then
57:	      return false, brute.Error:new( "Incorrect password" )
58:	    else
59:	      local err = brute.Error:new(resp)
60:	      err:setRetry(true)
61:	      return false, err

Incorrect password

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

52:	  login = function(self, username, password)
53:	    local status, resp = self.helper:regRelease(username, password)
54:	    if ( status ) then
55:	      return true, creds.Account:new( username, password, creds.State.VALID )
56:	    elseif ( resp == "Release failed" ) then
57:	      return false, brute.Error:new( "Incorrect password" )
58:	    else
59:	      local err = brute.Error:new(resp)
60:	      err:setRetry(true)
61:	      return false, err
62:	    end

Version

This page has been created based on Nmap version 7.92.

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