File Upload Security Best Practices Guide

This guide outlines best practices for ensuring file upload security to prevent cyberattacks. It begins by identifying the significant security risks associated with unsecure file transfers in the cloud, including vulnerabilities such as remote code execution and malware distribution. The document details various protective measures, including blocking malicious uploads, employing antivirus scanning, and limiting upload access to authenticated users. It emphasizes the importance of renaming original filenames to unique identifiers to avoid path traversal attacks and suggests processing files in a secure environment. Additionally, the guide discusses the need to sanitize metadata and contents of uploaded files, encrypt sensitive uploads, and enforce strict access controls. Continuous auditing of upload activities is also recommended to detect suspicious patterns. The document concludes with a brief explanation of file upload vulnerabilities and the concept of unrestricted file uploads, highlighting the risks they pose to security.