Simple FTP Fuzzer - Metasploit
This page contains detailed information about how to use the auxiliary/fuzzers/ftp/ftp_pre_post metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Simple FTP Fuzzer
Module: auxiliary/fuzzers/ftp/ftp_pre_post
Source code: modules/auxiliary/fuzzers/ftp/ftp_pre_post.rb
Disclosure date: -
Last modification time: 2019-03-05 03:38:51 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 21
List of CVEs: -
This module will connect to a FTP server and perform pre- and post-authentication fuzzing
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/fuzzers/ftp/ftp_pre_post
msf auxiliary(ftp_pre_post) > show options
... show and set options ...
msf auxiliary(ftp_pre_post) > set RHOSTS ip-range
msf auxiliary(ftp_pre_post) > exploit
Other examples of setting the RHOSTS option:
Example 1:
msf auxiliary(ftp_pre_post) > set RHOSTS 192.168.1.3-192.168.1.200
Example 2:
msf auxiliary(ftp_pre_post) > set RHOSTS 192.168.1.1/24
Example 3:
msf auxiliary(ftp_pre_post) > set RHOSTS file:/tmp/ip_list.txt
Required Options
- RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
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Msfconsole Usage
Here is how the fuzzers/ftp/ftp_pre_post auxiliary module looks in the msfconsole:
msf6 > use auxiliary/fuzzers/ftp/ftp_pre_post
msf6 auxiliary(fuzzers/ftp/ftp_pre_post) > show info
Name: Simple FTP Fuzzer
Module: auxiliary/fuzzers/ftp/ftp_pre_post
License: Metasploit Framework License (BSD)
Rank: Normal
Provided by:
corelanc0d3r <[email protected]>
jduck <[email protected]>
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
CONNRESET true no Break on CONNRESET error
DELAY 1 no Delay between connections in seconds
ENDSIZE 20000 no Fuzzing string endsize
FASTFUZZ true no Only fuzz with cyclic pattern
PASS [email protected] no Password
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 21 yes The target port (TCP)
STARTATSTAGE 1 no Start at this test stage
STARTSIZE 10 no Fuzzing string startsize
STEPSIZE 10 no Increase string size each iteration with this number of chars
STOPAFTER 2 no Stop after x number of consecutive errors
THREADS 1 yes The number of concurrent threads (max one per host)
USER anonymous no Username
Description:
This module will connect to a FTP server and perform pre- and
post-authentication fuzzing
Module Options
This is a complete list of options available in the fuzzers/ftp/ftp_pre_post auxiliary module:
msf6 auxiliary(fuzzers/ftp/ftp_pre_post) > show options
Module options (auxiliary/fuzzers/ftp/ftp_pre_post):
Name Current Setting Required Description
---- --------------- -------- -----------
CONNRESET true no Break on CONNRESET error
DELAY 1 no Delay between connections in seconds
ENDSIZE 20000 no Fuzzing string endsize
FASTFUZZ true no Only fuzz with cyclic pattern
PASS [email protected] no Password
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 21 yes The target port (TCP)
STARTATSTAGE 1 no Start at this test stage
STARTSIZE 10 no Fuzzing string startsize
STEPSIZE 10 no Increase string size each iteration with this number of chars
STOPAFTER 2 no Stop after x number of consecutive errors
THREADS 1 yes The number of concurrent threads (max one per host)
USER anonymous no Username
Advanced Options
Here is a complete list of advanced options supported by the fuzzers/ftp/ftp_pre_post auxiliary module:
msf6 auxiliary(fuzzers/ftp/ftp_pre_post) > show advanced
Module advanced options (auxiliary/fuzzers/ftp/ftp_pre_post):
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
ExpandCrash false no Expand any crash strings
FtpCommands ABOR ACCT ALLO APPE AUTH CWD CDUP DELE FEAT HELP HOST LANG LIST MDTM MK no Commands to fuzz at stages 4 and 5
D MLST MODE NLST NLST -al NOOP OPTS PASV PORT PROT PWD REIN REST RETR R
MD RNFR RNTO SIZE SITE SITE CHMOD SITE CHOWN SITE EXEC SITE MSG SITE PS
WD SITE ZONE SITE WHO SMNT STAT STOR STOU STRU SYST TYPE XCUP XCRC XCWD
XMKD XPWD XRMD
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
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
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
Auxiliary Actions
This is a list of all auxiliary actions that the fuzzers/ftp/ftp_pre_post module can do:
msf6 auxiliary(fuzzers/ftp/ftp_pre_post) > show actions
Auxiliary actions:
Name Description
---- -----------
Evasion Options
Here is the full list of possible evasion options supported by the fuzzers/ftp/ftp_pre_post auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 auxiliary(fuzzers/ftp/ftp_pre_post) > 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)
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Error Messages
This module may fail with the following error messages:
Error Messages
- STOPAFTER
- CONNRESET
- Exception <ERROR_CNT> of <NR_ERRORS>
- Rex::ConnectionRefused
- System does not respond - exiting nown
- Error: <E.CLASS> <E> <E.BACKTRACE>n
- Exception triggered, need <VALUE> more exception(s) before interrupting process
- STOPAFTER
- Exception <ERROR_CNT> of <NR_ERRORS>
- Rex::ConnectionRefused
- System does not respond - exiting nown
- Error: <E.CLASS> <E> <E.BACKTRACE>n
- Exception triggered, need <VALUE> more exception(s) before interrupting process
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.
STOPAFTER
Here is a relevant code snippet related to the "STOPAFTER" error message:
23: OptInt.new('STARTATSTAGE', [ false, "Start at this test stage",1]),
24: OptInt.new('STEPSIZE', [ false, "Increase string size each iteration with this number of chars",10]),
25: OptInt.new('DELAY', [ false, "Delay between connections in seconds",1]),
26: OptInt.new('STARTSIZE', [ false, "Fuzzing string startsize",10]),
27: OptInt.new('ENDSIZE', [ false, "Fuzzing string endsize",20000]),
28: OptInt.new('STOPAFTER', [ false, "Stop after x number of consecutive errors",2]),
29: OptString.new('USER', [ false, "Username",'anonymous']),
30: OptString.new('PASS', [ false, "Password",'[email protected]']),
31: OptBool.new('FASTFUZZ', [ false, "Only fuzz with cyclic pattern",true]),
32: OptBool.new('CONNRESET', [ false, "Break on CONNRESET error",true]),
33: ])
CONNRESET
Here is a relevant code snippet related to the "CONNRESET" error message:
27: OptInt.new('ENDSIZE', [ false, "Fuzzing string endsize",20000]),
28: OptInt.new('STOPAFTER', [ false, "Stop after x number of consecutive errors",2]),
29: OptString.new('USER', [ false, "Username",'anonymous']),
30: OptString.new('PASS', [ false, "Password",'[email protected]']),
31: OptBool.new('FASTFUZZ', [ false, "Only fuzz with cyclic pattern",true]),
32: OptBool.new('CONNRESET', [ false, "Break on CONNRESET error",true]),
33: ])
34:
35: @evilchars = [
36: 'A','a','%s','%d','%n','%x','%p','-1','0','0xfffffffe','0xffffffff','A/','//','/..','//..',
37: 'A%20','./A','.A',',A','A:','!A','&A','?A','\A','../A/','..?','//A:','\\A','{A','$A','A*',
Exception <ERROR_CNT> of <NR_ERRORS>
Here is a relevant code snippet related to the "Exception <ERROR_CNT> of <NR_ERRORS>" error message:
106:
107: count += datastore['STEPSIZE']
108:
109: rescue ::Exception => e
110: @error_cnt += 1
111: print_status("Exception #{@error_cnt} of #{@nr_errors}")
112: if (e.class.name == 'Rex::ConnectionRefused') or (e.class.name == 'EOFError') or (e.class.name == 'Errno::ECONNRESET' and datastore['CONNRESET']) or (e.class.name == 'Errno::EPIPE')
113: if datastore['ExpandCrash']
114: print_status("Crash string : #{prepend}#{evil}")
115: else
116: print_status("Crash string : #{prepend}#{evilstr} x #{count}")
Rex::ConnectionRefused
Here is a relevant code snippet related to the "Rex::ConnectionRefused" error message:
107: count += datastore['STEPSIZE']
108:
109: rescue ::Exception => e
110: @error_cnt += 1
111: print_status("Exception #{@error_cnt} of #{@nr_errors}")
112: if (e.class.name == 'Rex::ConnectionRefused') or (e.class.name == 'EOFError') or (e.class.name == 'Errno::ECONNRESET' and datastore['CONNRESET']) or (e.class.name == 'Errno::EPIPE')
113: if datastore['ExpandCrash']
114: print_status("Crash string : #{prepend}#{evil}")
115: else
116: print_status("Crash string : #{prepend}#{evilstr} x #{count}")
117: end
System does not respond - exiting nown
Here is a relevant code snippet related to the "System does not respond - exiting nown" error message:
114: print_status("Crash string : #{prepend}#{evil}")
115: else
116: print_status("Crash string : #{prepend}#{evilstr} x #{count}")
117: end
118: if @error_cnt >= @nr_errors
119: print_status("System does not respond - exiting now\n")
120: @stopprocess = true
121: print_error("Error: #{e.class} #{e} #{e.backtrace}\n")
122: return
123: else
124: print_status("Exception triggered, need #{@nr_errors - @error_cnt} more exception(s) before interrupting process")
Error: <E.CLASS> <E> <E.BACKTRACE>n
Here is a relevant code snippet related to the "Error: <E.CLASS> <E> <E.BACKTRACE>n" error message:
116: print_status("Crash string : #{prepend}#{evilstr} x #{count}")
117: end
118: if @error_cnt >= @nr_errors
119: print_status("System does not respond - exiting now\n")
120: @stopprocess = true
121: print_error("Error: #{e.class} #{e} #{e.backtrace}\n")
122: return
123: else
124: print_status("Exception triggered, need #{@nr_errors - @error_cnt} more exception(s) before interrupting process")
125: select(nil,nil,nil,3) #wait 3 seconds
126: end
Exception triggered, need <VALUE> more exception(s) before interrupting process
Here is a relevant code snippet related to the "Exception triggered, need <VALUE> more exception(s) before interrupting process" error message:
119: print_status("System does not respond - exiting now\n")
120: @stopprocess = true
121: print_error("Error: #{e.class} #{e} #{e.backtrace}\n")
122: return
123: else
124: print_status("Exception triggered, need #{@nr_errors - @error_cnt} more exception(s) before interrupting process")
125: select(nil,nil,nil,3) #wait 3 seconds
126: end
127: end
128: if @error_cnt >= @nr_errors
129: count += datastore['STEPSIZE']
STOPAFTER
Here is a relevant code snippet related to the "STOPAFTER" error message:
145:
146: def run_host(ip)
147:
148: startstage = datastore['STARTATSTAGE']
149:
150: @nr_errors = datastore['STOPAFTER']
151: @error_cnt = 0
152: @stopprocess = false
153:
154: if datastore['FASTFUZZ']
155: @evilchars = ['']
Exception <ERROR_CNT> of <NR_ERRORS>
Here is a relevant code snippet related to the "Exception <ERROR_CNT> of <NR_ERRORS>" error message:
222: select(nil, nil, nil, datastore['DELAY'])
223: @error_cnt = 0
224: end
225: rescue ::Exception => e
226: @error_cnt += 1
227: print_status("Exception #{@error_cnt} of #{@nr_errors}")
228: if (e.class.name == 'Rex::ConnectionRefused') or (e.class.name == 'EOFError') or (e.class.name == 'Errno::ECONNRESET' and datastore['CONNRESET']) or (e.class.name == 'Errno::EPIPE')
229: if @error_cnt >= @nr_errors
230: print_status("System does not respond - exiting now\n")
231: @stopprocess = true
232: print_error("Error: #{e.class} #{e} #{e.backtrace}\n")
Rex::ConnectionRefused
Here is a relevant code snippet related to the "Rex::ConnectionRefused" error message:
223: @error_cnt = 0
224: end
225: rescue ::Exception => e
226: @error_cnt += 1
227: print_status("Exception #{@error_cnt} of #{@nr_errors}")
228: if (e.class.name == 'Rex::ConnectionRefused') or (e.class.name == 'EOFError') or (e.class.name == 'Errno::ECONNRESET' and datastore['CONNRESET']) or (e.class.name == 'Errno::EPIPE')
229: if @error_cnt >= @nr_errors
230: print_status("System does not respond - exiting now\n")
231: @stopprocess = true
232: print_error("Error: #{e.class} #{e} #{e.backtrace}\n")
233: return
System does not respond - exiting nown
Here is a relevant code snippet related to the "System does not respond - exiting nown" error message:
225: rescue ::Exception => e
226: @error_cnt += 1
227: print_status("Exception #{@error_cnt} of #{@nr_errors}")
228: if (e.class.name == 'Rex::ConnectionRefused') or (e.class.name == 'EOFError') or (e.class.name == 'Errno::ECONNRESET' and datastore['CONNRESET']) or (e.class.name == 'Errno::EPIPE')
229: if @error_cnt >= @nr_errors
230: print_status("System does not respond - exiting now\n")
231: @stopprocess = true
232: print_error("Error: #{e.class} #{e} #{e.backtrace}\n")
233: return
234: else
235: print_status("Exception triggered, need #{@nr_errors - @error_cnt} more exception(s) before interrupting process")
Error: <E.CLASS> <E> <E.BACKTRACE>n
Here is a relevant code snippet related to the "Error: <E.CLASS> <E> <E.BACKTRACE>n" error message:
227: print_status("Exception #{@error_cnt} of #{@nr_errors}")
228: if (e.class.name == 'Rex::ConnectionRefused') or (e.class.name == 'EOFError') or (e.class.name == 'Errno::ECONNRESET' and datastore['CONNRESET']) or (e.class.name == 'Errno::EPIPE')
229: if @error_cnt >= @nr_errors
230: print_status("System does not respond - exiting now\n")
231: @stopprocess = true
232: print_error("Error: #{e.class} #{e} #{e.backtrace}\n")
233: return
234: else
235: print_status("Exception triggered, need #{@nr_errors - @error_cnt} more exception(s) before interrupting process")
236: select(nil,nil,nil,3) #wait 3 seconds
237: end
Exception triggered, need <VALUE> more exception(s) before interrupting process
Here is a relevant code snippet related to the "Exception triggered, need <VALUE> more exception(s) before interrupting process" error message:
230: print_status("System does not respond - exiting now\n")
231: @stopprocess = true
232: print_error("Error: #{e.class} #{e} #{e.backtrace}\n")
233: return
234: else
235: print_status("Exception triggered, need #{@nr_errors - @error_cnt} more exception(s) before interrupting process")
236: select(nil,nil,nil,3) #wait 3 seconds
237: end
238: end
239: if @error_cnt >= @nr_errors
240: @error_cnt = 0
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Related Pull Requests
- #11523 Merged Pull Request: MSF5: Remove unneeded RHOST deregister in scanners
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #2525 Merged Pull Request: Change module boilerplate
- #1228 Merged Pull Request: MSFTIDY cleanup #1 - auxiliary
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See Also
Check also the following modules related to this module:
- exploit/linux/samba/chain_reply
- exploit/windows/ftp/32bitftp_list_reply
- exploit/windows/ftp/aasync_list_reply
- exploit/windows/ftp/filewrangler_list_reply
- exploit/windows/ftp/ftpgetter_pwd_reply
- exploit/windows/ftp/ftpshell51_pwd_reply
- exploit/windows/ftp/ftpsynch_list_reply
- exploit/windows/ftp/gekkomgr_list_reply
- exploit/windows/ftp/leapftp_list_reply
- exploit/windows/ftp/leapftp_pasv_reply
- exploit/windows/ftp/odin_list_reply
- exploit/windows/ftp/seagull_list_reply
- auxiliary/fuzzers/ftp/client_ftp
- auxiliary/scanner/ftp/ftp_login
- auxiliary/scanner/ftp/ftp_version
- exploit/mainframe/ftp/ftp_jcl_creds
- auxiliary/dos/windows/ftp/filezilla_admin_user
- auxiliary/dos/windows/ftp/filezilla_server_port
- auxiliary/dos/windows/ftp/guildftp_cwdlist
- auxiliary/dos/windows/ftp/iis75_ftpd_iac_bof
- auxiliary/dos/windows/ftp/iis_list_exhaustion
- auxiliary/dos/windows/ftp/solarftp_user
- auxiliary/dos/windows/ftp/titan626_site
- auxiliary/dos/windows/ftp/vicftps50_list
- auxiliary/dos/windows/ftp/winftp230_nlst
- auxiliary/dos/windows/ftp/xmeasy560_nlst
- auxiliary/dos/windows/ftp/xmeasy570_nlst
- auxiliary/scanner/ftp/anonymous
- auxiliary/scanner/ftp/bison_ftp_traversal
- auxiliary/scanner/ftp/colorado_ftp_traversal
- auxiliary/scanner/ftp/easy_file_sharing_ftp
- auxiliary/scanner/ftp/konica_ftp_traversal
- auxiliary/scanner/ftp/pcman_ftp_traversal
- auxiliary/scanner/ftp/titanftp_xcrc_traversal
- auxiliary/dos/http/dell_openmanage_post
Authors
- corelanc0d3r <peter.ve[at]corelan.be>
- jduck
Version
This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.
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