FTP Authentication Scanner - Metasploit


This page contains detailed information about how to use the auxiliary/scanner/ftp/ftp_login metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
hide

Module Overview

Name: FTP Authentication Scanner
Module: auxiliary/scanner/ftp/ftp_login
Source code: modules/auxiliary/scanner/ftp/ftp_login.rb
Disclosure date: -
Last modification time: 2021-08-31 17:10:07 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: ftp
Target network port(s): 21, 2121
List of CVEs: CVE-1999-0502

This module will test FTP logins on a range of machines and report successful logins. If you have loaded a database plugin and connected to a database this module will record successful logins and hosts so you can track your access.

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

This module is a scanner module, and is capable of testing against multiple hosts.

msf > use auxiliary/scanner/ftp/ftp_login
msf auxiliary(ftp_login) > show options
    ... show and set options ...
msf auxiliary(ftp_login) > set RHOSTS ip-range
msf auxiliary(ftp_login) > exploit

Other examples of setting the RHOSTS option:

Example 1:

msf auxiliary(ftp_login) > set RHOSTS 192.168.1.3-192.168.1.200

Example 2:

msf auxiliary(ftp_login) > set RHOSTS 192.168.1.1/24

Example 3:

msf auxiliary(ftp_login) > set RHOSTS file:/tmp/ip_list.txt

Required Options

  • RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'

Knowledge Base

Description

This module will test FTP logins on a range of machines and report successful logins. If you have loaded a database plugin and connected to a database this module will record successful logins and hosts so you can track your access.

Vulnerable Application

Install ftp server on Kali Linux:

  1. apt-get install vsftpd

  2. Allow local users to log in and to allow ftp uploads by editing file /etc/vsftpd.conf uncommenting the following:

    local_enable=YES
write_enable=YES
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd.chroot_list

  3. Create the file /etc/vsftpd.chroot_list and add the local users you want allow to connect to FTP server. Start service and test connections:

  4. service vsftpd start

Installing FTP for IIS 7.5 in Windows:

IIS 7.5 for Windows Server 2008 R2:

  1. On the taskbar, click Start, point to Administrative Tools, and then click Server Manager.
  2. In the Server Manager hierarchy pane, expand Roles, and then click Web Server (IIS).
  3. In the Web Server (IIS) pane, scroll to the Role Services section, and then click Add Role Services.
  4. On the Select Role Services page of the Add Role Services Wizard, expand FTP Server.
  5. Select FTP Service. (Note: To support ASP.NET Membership or IIS Manager authentication for the FTP service, you will also need to select FTP Extensibility.)
  6. Click Next.
  7. On the Confirm Installation Selections page, click Install.
  8. On the Results page, click Close.

IIS 7.5 for Windows 7:

  1. On the taskbar, click Start, and then click Control Panel.
  2. In Control Panel, click Programs and Features, and then click Turn Windows Features on or off.
  3. Expand Internet Information Services, then FTP Server.
  4. Select FTP Service. (Note: To support ASP.NET Membership or IIS Manager authentication for the FTP service, you will also need to select FTP Extensibility.)
  5. Click OK.

Verification Steps

  1. Do: use auxiliary/scanner/ftp/ftp_login
  2. Do: set RHOSTS [IP]
  3. Do: set RPORT [IP]
  4. Do: run

Scenarios

msf> use auxiliary/scanner/ftp/ftp_login
msf auxiliary(ftp_login) > set RHOSTS ftp.openbsd.org
msf auxiliary(ftp_login) > set USERNAME ftp
msf auxiliary(ftp_login) > set PASSWORD [email protected]
msf auxiliary(ftp_login) > run
[*] 129.128.5.191:21 - Starting FTP login sweep
[+] 129.128.5.191:21 - LOGIN SUCCESSFUL: ftp:[email protected]
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
msf auxiliary(ftp_login) >

Go back to menu.

Msfconsole Usage

Here is how the scanner/ftp/ftp_login auxiliary module looks in the msfconsole:

msf6 > use auxiliary/scanner/ftp/ftp_login

msf6 auxiliary(scanner/ftp/ftp_login) > show info

       Name: FTP Authentication Scanner
     Module: auxiliary/scanner/ftp/ftp_login
    License: Metasploit Framework License (BSD)
       Rank: Normal

Provided by:
  todb <[email protected]>

Check supported:
  No

Basic options:
  Name              Current Setting  Required  Description
  ----              ---------------  --------  -----------
  BLANK_PASSWORDS   false            no        Try blank passwords for all users
  BRUTEFORCE_SPEED  5                yes       How fast to bruteforce, from 0 to 5
  DB_ALL_CREDS      false            no        Try each user/password couple stored in the current database
  DB_ALL_PASS       false            no        Add all passwords in the current database to the list
  DB_ALL_USERS      false            no        Add all users in the current database to the list
  PASSWORD                           no        A specific password to authenticate with
  PASS_FILE                          no        File containing passwords, one per line
  Proxies                            no        A proxy chain of format type:host:port[,type:host:port][...]
  RECORD_GUEST      false            no        Record anonymous/guest logins to the database
  RHOSTS                             yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT             21               yes       The target port (TCP)
  STOP_ON_SUCCESS   false            yes       Stop guessing when a credential works for a host
  THREADS           1                yes       The number of concurrent threads (max one per host)
  USERNAME                           no        A specific username to authenticate as
  USERPASS_FILE                      no        File containing users and passwords separated by space, one pair per line
  USER_AS_PASS      false            no        Try the username as the password for all users
  USER_FILE                          no        File containing usernames, one per line
  VERBOSE           true             yes       Whether to print output for all attempts

Description:
  This module will test FTP logins on a range of machines and report 
  successful logins. If you have loaded a database plugin and 
  connected to a database this module will record successful logins 
  and hosts so you can track your access.

References:
  https://nvd.nist.gov/vuln/detail/CVE-1999-0502

Module Options

This is a complete list of options available in the scanner/ftp/ftp_login auxiliary module:

msf6 auxiliary(scanner/ftp/ftp_login) > show options

Module options (auxiliary/scanner/ftp/ftp_login):

   Name              Current Setting  Required  Description
   ----              ---------------  --------  -----------
   BLANK_PASSWORDS   false            no        Try blank passwords for all users
   BRUTEFORCE_SPEED  5                yes       How fast to bruteforce, from 0 to 5
   DB_ALL_CREDS      false            no        Try each user/password couple stored in the current database
   DB_ALL_PASS       false            no        Add all passwords in the current database to the list
   DB_ALL_USERS      false            no        Add all users in the current database to the list
   PASSWORD                           no        A specific password to authenticate with
   PASS_FILE                          no        File containing passwords, one per line
   Proxies                            no        A proxy chain of format type:host:port[,type:host:port][...]
   RECORD_GUEST      false            no        Record anonymous/guest logins to the database
   RHOSTS                             yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT             21               yes       The target port (TCP)
   STOP_ON_SUCCESS   false            yes       Stop guessing when a credential works for a host
   THREADS           1                yes       The number of concurrent threads (max one per host)
   USERNAME                           no        A specific username to authenticate as
   USERPASS_FILE                      no        File containing users and passwords separated by space, one pair per line
   USER_AS_PASS      false            no        Try the username as the password for all users
   USER_FILE                          no        File containing usernames, one per line
   VERBOSE           true             yes       Whether to print output for all attempts

Advanced Options

Here is a complete list of advanced options supported by the scanner/ftp/ftp_login auxiliary module:

msf6 auxiliary(scanner/ftp/ftp_login) > show advanced

Module advanced options (auxiliary/scanner/ftp/ftp_login):

   Name                  Current Setting  Required  Description
   ----                  ---------------  --------  -----------
   CHOST                                  no        The local client address
   CPORT                                  no        The local client port
   ConnectTimeout        10               yes       Maximum number of seconds to establish a TCP connection
   FTPDEBUG              false            no        Whether or not to print verbose debug statements
   FTPTimeout            16               yes       The number of seconds to wait for a reply from an FTP command
   MaxGuessesPerService  0                no        Maximum number of credentials to try per service instance. If set to zero or a non-number, this option will not be used.
   MaxGuessesPerUser     0                no        Maximum guesses for a particular username for the service instance. Note that users are considered unique among different services, so a user at 10.1.1.1:22 is different from one at 10.2.2.2:
                                                    22, and both will be tried up to the MaxGuessesPerUser limit. If set to zero or a non-number, this option will not be used.
   MaxMinutesPerService  0                no        Maximum time in minutes to bruteforce the service instance. If set to zero or a non-number, this option will not be used.
   PassiveMode           false            no        Set true for extended passive (EPSV) ftp mode.
   REMOVE_PASS_FILE      false            yes       Automatically delete the PASS_FILE on module completion
   REMOVE_USERPASS_FILE  false            yes       Automatically delete the USERPASS_FILE on module completion
   REMOVE_USER_FILE      false            yes       Automatically delete the USER_FILE on module completion
   SINGLE_SESSION        false            no        Disconnect after every login attempt
   SSL                   false            no        Negotiate SSL/TLS for outgoing connections
   SSLCipher                              no        String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
   SSLVerifyMode         PEER             no        SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
   SSLVersion            Auto             yes       Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
   ShowProgress          true             yes       Display progress messages during a scan
   ShowProgressPercent   10               yes       The interval in percent that progress should be shown
   TRANSITION_DELAY      0                no        Amount of time (in minutes) to delay before transitioning to the next user in the array (or password when PASSWORD_SPRAY=true)
   WORKSPACE                              no        Specify the workspace for this module

Auxiliary Actions

This is a list of all auxiliary actions that the scanner/ftp/ftp_login module can do:

msf6 auxiliary(scanner/ftp/ftp_login) > show actions

Auxiliary actions:

   Name  Description
   ----  -----------

Evasion Options

Here is the full list of possible evasion options supported by the scanner/ftp/ftp_login auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(scanner/ftp/ftp_login) > show evasion

Module evasion options:

   Name                Current Setting  Required  Description
   ----                ---------------  --------  -----------
   TCP::max_send_size  0                no        Maxiumum tcp segment size.  (0 = disable)
   TCP::send_delay     0                no        Delays inserted before every send.  (0 = disable)

Go back to menu.

Error Messages

This module may fail with the following error messages:

Error Messages

Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.

<IP>:<RPORT> - LOGIN FAILED: <RESULT.CREDENTIAL> (<RESULT.STATUS>: <RESULT.PROOF>)

Here is a relevant code snippet related to the "<IP>:<RPORT> - LOGIN FAILED: <RESULT.CREDENTIAL> (<RESULT.STATUS>: <RESULT.PROOF>)" error message:

93:	        create_credential_login(credential_data)
94:	
95:	        print_good "#{ip}:#{rport} - Login Successful: #{result.credential}"
96:	      else
97:	        invalidate_login(credential_data)
98:	        vprint_error "#{ip}:#{rport} - LOGIN FAILED: #{result.credential} (#{result.status}: #{result.proof})"
99:	      end
100:	    end
101:	
102:	  end
103:

Go back to menu.

References

See Also

Check also the following modules related to this module:

Related Nessus plugins:

Authors

todb

Version

This page has been produced using Metasploit Framework version 6.1.29-dev. For more modules, visit the Metasploit Module Library.

Go back to menu.