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Nov 8, 2019 · Information Security

How to Exploit Apache Commons FileUpload Deserialization: Payloads, Code Walkthrough, and Fixes

This article dissects the Apache Commons FileUpload DiskFileItem deserialization flaw, explains how readObject can be abused to write arbitrary files or directories depending on FileUpload and JDK versions, demonstrates payload construction with ysoserial, provides full Java code analysis, and outlines mitigation strategies.