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SNMP

Introduction

  • Simple Network Management Protocol (SNMP) is a protocol for monitoring different devices in the network

  • It can contain different information about devices, including logs and credentials

  • By default, SNMNP runs on port 161 UDP

  • SNMP often requires a "community string" to authenticate

SNMP Enumeration

CommandDescription

snmpwalk -v2c -c <FQDN/IP>

Querying OIDs using snmpwalk.

onesixtyone -c community-strings.list <FQDN/IP>

Bruteforcing community strings of the SNMP service.

braa @<FQDN/IP>:.1.*

Bruteforcing SNMP service OIDs.

snmp-check -c

Enumerate SNMP

SNMP Enumeration using snmpwalk

The following examples are given using the public community string. Replace it with your community string if needed.

  1. List all Windows Users: snmpwalk -v <snmp-version> -c <string> <IP> 1.3.6.1.4.1.77.1.2.25

  2. List all running processes: snmpwalk-v <snmp-version> -c <string> <IP> 1.3.6.1.2.1.25.4.2.1.2

  3. List all installed software: snmpwalk -v <snmp-version> -c <string> <IP> 1.3.6.1.2.1.25.6.3.1.2

  4. List TCP listening ports: snmpwalk -v <snmp-version> -c <string> <IP> 1.3.6.1.2.1.6.13.1.3

  5. Enumerate all info (might be too verbose): snmpwalk -v <snmp-version> -c <community-string> <IP> .1

  6. Get extended objects (might reveal some otherwise hidden info): snmpwalk -v <snmp-version> -c <string> <IP> NET-SNMP-EXTEND-MIB::nsExtendObjects

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