CodeIgniter before 2.2.0 makes it easier for attackers to decode session cookies by leveraging fallback to a custom XOR-based encryption scheme when the Mcrypt extension for PHP is not available.Referenceshttps://beyondbinary.io/articles/seagate-nas-rce/http://packetstormsecurity.com/files/130609/Seagate-Business-NAS-Unauthenticated-Remote-Command-Execution.htmlhttps://www.dionach.com/blog/codeigniter-session-decoding-vulnerabilityhttps://codeigniter.com/userguide2/changelog.html
