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File Upload Bypass

Upload malicious files. Bypass filters. Execute code. Web shells and backdoors.

📖 Theory Panel Active

File upload vulnerabilities occur when web applications fail to properly validate uploaded files, allowing attackers to upload malicious files (web shells, backdoors) that can be executed on the server.

Impact:

  • • Remote Code Execution (RCE)
  • • Complete server compromise
  • • Data exfiltration
  • • Privilege escalation
  • • Persistent backdoor access

📡 Interactive Simulation Mode

Upload Console

Ready to Upload

Vulnerable Configuration

Weak Extension Check
Only checking file extension, not content
Client-Side Validation Only
Easily bypassed with proxy tools
Executable Uploads Directory
PHP scripts can execute in /uploads/

Secure File Upload

  • Content Type Validation: Parse file content, not just extension
  • Rename Files: Use random/hash-based names
  • Separate Storage: Store outside web root
  • Disable Execution: Configure web server to block script execution
  • File Size Limits: Prevent DoS via large files
  • Antivirus Scanning: Scan all uploads

OPSEC: Authorized Testing Only

Uploading webshells is illegal without explicit authorization. Always implement proper file validation, content-type checking, and execute uploads in sandboxed environments. Critical OWASP Top 10 vulnerability.

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