OS Command Injection Vulnerability Uncovered and MitigatedOS Command Injection Vulnerability Uncovered and Mitigated
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Usama Rasheed
• Jun 28
🚨 Vulnerability Spotlight: OS Command Injection
⚠️ The Flaw: Unsanitized input in a "Ping Device" feature allowed arbitrary command execution directly on the server shell.
🕵️‍♂️ The Exploit (via Burp Suite): Instead of a normal IP, I injected shell metacharacters: 127.0.0.1; cat /etc/passwd. Result: The backend blindly executed it, leaking sensitive OS files and confirming unauthorized system access.
🛡️ The Fix: ✅ Stop Direct Execution: Never pass raw input to exec() or system(). ✅ Strict Allow-listing: Validate inputs with Regex (e.g., enforce standard IPv4 format). ✅ Command Escaping: Neutralize malicious operators using escapeshellarg().
Rule of thumb: Never trust user input!
CybersecurityBurp Suiteinfosec
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