Nmap cvs-brute-repository NSE Script

Script Overview

---

Script source code: https://github.com/nmap/nmap/tree/master/scripts/cvs-brute-repository.nse
Script categories: intrusive, brute
Target service / protocol: cvspserver
Target network port(s): 2401
List of CVEs: -

Script Description

---

The cvs-brute-repository.nse script attempts to guess the name of the CVS repositories hosted on the remote server. With knowledge of the correct repository name, usernames and passwords can be guessed.

Cvs-brute-repository NSE Script Arguments

---

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

cvs-brute-repository.nodefault

When set the script does not attempt to guess the list of hardcoded repositories

cvs-brute-repository.repofile

A file containing a list of repositories to guess

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=cvs-brute-repository --script-args cvs-brute-repository.nodefault=value,cvs-brute-repository.repofile=value <target>

Cvs-brute-repository NSE Script Example Usage

---

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

nmap -p 2401 --script cvs-brute-repository <host>

Cvs-brute-repository NSE Script Example Output

---

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

PORT     STATE SERVICE    REASON
2401/tcp open  cvspserver syn-ack
| cvs-brute-repository:
|   Repositories
|     /myrepos
|     /demo
|   Statistics
|_    Performed 14 guesses in 1 seconds, average tps: 14

Cvs-brute-repository 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

---

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

See Also

---

Related NSE scripts to the cvs-brute-repository.nse script:

• cvs-brute.nse

Visit Nmap NSE Library for more scripts.

The cvs-brute-repository.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.

Incorrect password

---

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

68:	      -- script can use them later.
69:	      self.host.registry.cvs_repos = self.host.registry.cvs_repos or {}
70:	      table.insert(self.host.registry.cvs_repos, password)
71:	      return true, creds.Account:new(username, password, 0)
72:	    end
73:	    return false, brute.Error:new( "Incorrect password" )
74:	  end,
75:	
76:	  disconnect = function( self )
77:	    self.helper:close()
78:	  end,

Failed to open repository file: %s

---

Here is a relevant code snippet related to the "Failed to open repository file: %s" error message:

97:	  local f
98:	
99:	  if ( repofile ) then
100:	    f = io.open( repofile, "r" )
101:	    if ( not(f) ) then
102:	      return stdnse.format_output(false, ("Failed to open repository file: %s"):format(repofile))
103:	    end
104:	  end
105:	
106:	  local function repository_iterator()
107:	    local function next_repo()