What is the main issue with the dl.php script in the forum thread?

The main issue with the dl.php script in the forum thread is that it is vulnerable to directory traversal attacks. This means that users can potentially access files outside of the intended directory, leading to a security risk. To solve this issue, you should sanitize the input parameter to ensure that it only allows access to files within the specified directory. 

// Sanitize the input parameter to prevent directory traversal attacks
$file = $_GET['file'];
$allowed_directory = '/path/to/allowed/directory/';
$full_path = realpath($allowed_directory . $file);

if (strpos($full_path, $allowed_directory) === 0 && file_exists($full_path)) {
    // Serve the file
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . basename($full_path) . '"');
    readfile($full_path);
} else {
    // Handle invalid file request
    echo 'Invalid file request';
}

Keywords

dl.php script forum thread error issue

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