The project is a specialized security tool designed to automate the testing of web application file upload forms. It helps security researchers and developers identify vulnerabilities like Remote Code Execution (RCE) by attempting to bypass upload filters through various obfuscation and manipulation techniques. Key Features and Objectives
: Probes the server to identify the backend language (PHP, Node.js, Python, .NET) and the web server type (Apache, Nginx, IIS) to tailor the payloads. Bypass Testing Extension Fuzzing : Tries variants like , or double extensions like Content-Type Spoofing : Modifies the Content-Type header (e.g., changing application/x-php image/jpeg ) to fool basic filters. Magic Byte Injection
SecRule FILES_TMP_CONTENT "@contains <?php" "id:10001,deny,msg:'PHP script in upload'" fileupload gunner project
File upload vulnerabilities are critical because they can lead to full system compromise. If an attacker can successfully upload a web shell, they can gain persistent access to the server. Tools like FileUpload Gunner streamline the OWASP File Upload Cheat Sheet testing process, ensuring that developers implement robust defenses such as:
Attackers upload malicious.pdf.exe . Many filters check only the last extension. : The project iterates over all dot-separated segments and blocks if any non-whitelisted extension appears after the first dot. The project is a specialized security tool designed
: The primary goal is to upload a web shell, allowing the attacker to run arbitrary commands on the server.
// Whitelist of allowed mime types and extensions const ALLOWED_MIME = ['image/jpeg', 'image/png', 'application/pdf']; const MAX_SIZE = 2 * 1024 * 1024; // 2MB Bypass Testing Extension Fuzzing : Tries variants like
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A true Gunner must understand both attack and defense. Here are three advanced techniques the project helps you master.