What are the security implications of using external commands in PHP scripts?

Using external commands in PHP scripts can pose security risks such as command injection attacks if user input is not properly sanitized. To mitigate these risks, it is important to validate and sanitize user input before passing it to external commands. Additionally, using functions like escapeshellarg() or escapeshellcmd() can help prevent command injection vulnerabilities. 

$user_input = $_POST['user_input']; // Assuming user input is coming from a form

// Sanitize user input using escapeshellarg()
$command = 'ls ' . escapeshellarg($user_input);

// Execute the command safely
$output = shell_exec($command);
echo $output;

Keywords

shell_exec system exec security vulnerabilities command injection

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