About Command Injection
Command Injection vulnerabilities occur when an attacker can inject and execute arbitrary commands on the server. This happens when user input is directly used in system commands without proper validation or sanitization.
Common Command Injection Attack Types
Basic Command Injection: Simple command injection using basic payloads
Filter Bypass: Bypassing security filters and WAFs
File Upload Injection: Exploiting command injection through file upload functionality
Advanced Techniques: Complex methods to bypass modern protections
RCE via Injection: Achieving remote code execution through command injection
Common Vulnerable Functions
PHP: system(), exec(), shell_exec(), passthru(), popen()
Python: os.system(), subprocess.call(), subprocess.run()
Node.js: child_process.exec(), child_process.spawn()
Java: Runtime.exec(), ProcessBuilder
C#: Process.Start(), Process.StartInfo
Real-World Impact
Remote Code Execution (RCE) on the server
File system access and arbitrary file operations
Bypass authentication and authorization mechanisms
Data exfiltration and sensitive information disclosure
Server compromise and lateral movement
Compliance violations and security breaches