QNAP QTS before 4.2.4 Build 20170313 allows local users to obtain sensitive Domain Administrator password information by reading data in an XOR format within the /etc/config/uLinux.conf configuration file.
https://www.qnap.com/en/support/con_show.php?cid=113
https://www.qnap.com/en-us/releasenotes/
https://www.exploit-db.com/exploits/41745/
http://www.ush.it/team/ush/hack-qnap/qnap.txt
http://www.securitytracker.com/id/1038091