Cisco SNMP

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Pentesting Cisco Networks

SNMP functions over UDP with ports 161/UDP for general messages and 162/UDP for trap messages. This protocol relies on community strings, serving as passwords that enable communication between SNMP agents and servers. These strings are pivotal for they determine access levels, specifically read-only (RO) or read-write (RW) permissions. A notable attack vector for pentesters is the brute-forcing of community strings, aiming to infiltrate network devices.

A practical tool for executing such brute-force attacks is onesixtyone, which necessitates a list of potential community strings and the IP addresses of the targets:

bash
onesixtyone -c communitystrings -i targets

cisco_config_tftp

The Metasploit framework features the cisco_config_tftp module, facilitating the extraction of device configurations, contingent upon acquiring an RW community string. Essential parameters for this operation include:

  • RW community string (COMMUNITY)
  • Attacker's IP (LHOST)
  • Target device's IP (RHOSTS)
  • Destination path for the configuration files (OUTPUTDIR)

Upon configuration, this module enables the download of device settings directly to a specified folder.

snmp_enum

Another Metasploit module, snmp_enum, specializes in gathering detailed hardware information. It operates with either type of community string and requires the target's IP address for successful execution:

bash
msf6 auxiliary(scanner/snmp/snmp_enum) > set COMMUNITY public
msf6 auxiliary(scanner/snmp/snmp_enum) > set RHOSTS 10.10.100.10
msf6 auxiliary(scanner/snmp/snmp_enum) > exploit

References

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