Shell Exec

How Command Injection happens in PHP shell execution and how to fix it

A command injection vulnerability in `sitrecServer/windProxy.php` allowed user-controlled input to reach a shell command without proper sanitization, creating a remote code execution risk. The `$cycleHour` parameter was passed directly as a format integer (`%d`) into a `sprintf`-built shell command, bypassing the `escapeshellarg()` protection applied to all other arguments. The fix casts `$cycleHour` to an integer and wraps it with `escapeshellarg()`, closing the injection path entirely.