Arbitrary File Write Vulnerability in Spring Cloud Data Flow

Spring Cloud Data Flow is a microservices-based Streaming and Batch data processing in Cloud Foundry and Kubernetes. The Skipper server has the ability to receive upload package requests. However, due to improper sanitization for upload path, a malicious user who has access to skipper server api can use a crafted upload request to write arbitrary file to any location on file system, may even compromises the server.