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Logstash is used for collecting, transforming and outputting logs. This is realized by using **pipelines**, which contain input, filter and output modules. The service gets interesting when having compromised a machine which is running Logstash as a service.
In here you can find the paths to the **.conf** files, which contain the configured pipelines. If the **Elasticsearch output module** is used, **pipelines** are likely to **contain** valid **credentials** for an Elasticsearch instance. Those credentials have often more privileges, since Logstash has to write data to Elasticsearch. If wildcards are used, Logstash tries to run all pipelines located in that folder matching the wildcard.
Before trying to elevate your own privileges you should check which user is running the logstash service, since this will be the user, you will be owning afterwards. Per default the logstash service runs with the privileges of the **logstash** user.
Check whether you have **one** of the required rights:
* **/etc/logstash/pipelines.yml** contains a wildcard and you are allowed to write into the specified folder
Further **one** of the requirements must be met:
* You are able to restart the logstash service **or**
* **/etc/logstash/logstash.yml** contains the entry **config.reload.automatic: true**
If a wildcard is specified, try to create a file matching that wildcard. Following content can be written into the file to execute commands:
```bash
input {
exec {
command => "whoami"
interval => 120
}
}
output {
file {
path => "/tmp/output.log"
codec => rubydebug
}
}
```
The **interval** specifies the time in seconds. In this example the **whoami** command is executed every 120 seconds. The output of the command is saved into **/tmp/output.log**.
If **/etc/logstash/logstash.yml** contains the entry **config.reload.automatic: true** you only have to wait until the command gets executed, since Logstash will automatically recognize new pipeline configuration files or any changes in existing pipeline configurations. Otherwise trigger a restart of the logstash service.
If no wildcard is used, you can apply those changes to an existing pipeline configuration. **Make sure you do not break things!**
- 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)!
- **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](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)**.
