hunt-file-upload

To test file upload vulnerabilities for RCE and XSS, audit insecure endpoints like /upload or /avatar by systematically applying bypass techniques such as extension manipulation, magic byte spoofing, and null byte injection to verify server-side execution handling.

Common file upload bypass techniques in pentesting include extension manipulation, magic byte spoofing, and null byte injection. These methods test whether endpoints improperly validate file types, allowing malicious payloads like PHP shells or XSS SVGs to execute.

Yes, you can detect SSRF through file upload features by systematically validating endpoints like /import or /upload. Testing verifies if server-side document processing can be coerced into triggering Server-Side Request Forgery via malicious file payloads.

Magic byte spoofing works to bypass web application upload restrictions when servers rely solely on file header inspection. By injecting valid magic bytes into a malicious file, attackers can disguise payloads to evade inadequate validation filters.

The best way to audit an avatar upload feature for security flaws is to systematically test the endpoint against multiple bypass methods. Verify whether the application accepts malicious PHP shells or SVG files containing XSS payloads through extension manipulation.

Null byte injection bypasses file extension validation by exploiting string termination handling in server-side code. Injecting a null character truncates the filename, tricking the server into processing a benign extension while executing the malicious actual extension.