What potential issues can arise when handling sessions in PHP, as seen in the provided code snippet?

One potential issue that can arise when handling sessions in PHP is the possibility of session fixation attacks, where an attacker sets a user's session ID to a known value. To prevent this, it is recommended to regenerate the session ID whenever a user's privilege level changes or upon successful login. This can be achieved by calling session_regenerate_id(true) in the appropriate places in the code. 

// Start or resume a session
session_start();

// Check if the session ID needs to be regenerated
if (isset($_SESSION['privilege_level_changed']) && $_SESSION['privilege_level_changed']) {
    session_regenerate_id(true);
    $_SESSION['privilege_level_changed'] = false;
}

// Code to handle privilege level changes or successful login
// Set $_SESSION['privilege_level_changed'] = true; when privilege level changes or upon successful login

Keywords

session fixation session hijacking session_regenerate_id session_destroy session_start

Related Questions