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Prerequisites & Requirements

• Basic knowledge of HTTP protocols and web applications
• Understanding of Server-Side Request Forgery (SSRF) vulnerabilities
• Knowledge of URL parsing differences between Python libraries
• Familiarity with Flask web framework
• Basic understanding of localhost/private IP restrictions
• Experience with URL encoding and special characters

What will you learn?

• How URL parsing confusion vulnerabilities work
• The differences between urllib.parse and requests library URL handling
• SSRF exploitation techniques and bypass methods
• How to identify parsing inconsistencies between different libraries
• The importance of consistent input validation across all components
• How to use backslash (\) and @ characters to confuse URL parsers
• Directory traversal techniques in URL paths

Tools

• Python 3 - For writing exploitation scripts
• Web Browser - For manual testing and payload delivery
• Text Editor - For analyzing source code