Nmap cvs-brute NSE Script
This page contains detailed information about how to use the cvs-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/cvs-brute.nse
Script categories: intrusive, brute
Target service / protocol: cvspserver
Target network port(s): 2401
List of CVEs: -
Script Description
The cvs-brute.nse script performs brute force password auditing against CVS pserver authentication.
Cvs-brute NSE Script Arguments
This is a full list of arguments supported by the cvs-brute.nse script:
cvs-brute.repoString containing the name of the repository to brute if no repo was given the script checks the registry for any repositories discovered by the cvs-brute-repository script. If the registry contains any discovered repositories, the script attempts to brute force the credentials for the first one.
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=cvs-brute --script-args cvs-brute.repo=value,creds.global=value <target>
Cvs-brute NSE Script Example Usage
Here's an example of how to use the cvs-brute.nse script:
nmap -p 2401 --script cvs-brute <host>
Cvs-brute NSE Script Example Output
Here's a sample output from the cvs-brute.nse script:
2401/tcp open cvspserver syn-ack
| cvs-brute:
| Accounts
| hotchner:francisco - Account is valid
| reid:secret - Account is valid
| Statistics
|_ Performed 544 guesses in 14 seconds, average tps: 38
Cvs-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
- https://nmap.org/nsedoc/scripts/cvs-brute.html
- https://github.com/nmap/nmap/tree/master/scripts/cvs-brute.nse
See Also
Related NSE scripts to the cvs-brute.nse script:
Visit Nmap NSE Library for more scripts.
The cvs-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.
Account invalid
Here is a relevant code snippet related to the "Account invalid" error message:
61: end
62:
63: -- This error seems to indicate that the user does not exist
64: if ( err:match("E PAM start error%: Critical error %- immediate abort\0$") ) then
65: stdnse.debug2("The user %s does not exist", username)
66: local err = brute.Error:new("Account invalid")
67: err:setInvalidAccount(username)
68: return false, err
69: end
70: return false, brute.Error:new( "Incorrect password" )
71: end,
Incorrect password
Here is a relevant code snippet related to the "Incorrect password" error message:
65: stdnse.debug2("The user %s does not exist", username)
66: local err = brute.Error:new("Account invalid")
67: err:setInvalidAccount(username)
68: return false, err
69: end
70: return false, brute.Error:new( "Incorrect password" )
71: end,
72:
73: disconnect = function( self )
74: self.helper:close()
75: end,
ERROR: No CVS repository specified (see cvs-brute.repo)
Here is a relevant code snippet related to the "ERROR: No CVS repository specified (see cvs-brute.repo)" error message:
88: action = function(host, port)
89:
90: local repo = stdnse.get_script_args("cvs-brute.repo") and
91: { stdnse.get_script_args("cvs-brute.repo") } or
92: getDiscoveredRepos(host)
93: if ( not(repo) ) then stdnse.verbose1("ERROR: No CVS repository specified (see cvs-brute.repo)") end
94:
95: local status, result
96:
97: -- If repositories were discovered and not overridden by argument
98: -- only attempt to brute force the first one.
Version
This page has been created based on Nmap version 7.92.
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