In the older version, 6.4 for example, when an ordinary user attempted su command, he/she would get Permission denied error.<br />
In 7.1.1503, an ordinary user can attempt su command and gets root access with no extra authentication required. After some checking, I believe the issue is here:<br />
(CentOS 6.4) -rwsr-x--- 1 root wheel 34904 Apr 4 2013 su*<br />
(CentOS 7.1) -rwsr-xr-x. 1 root root 32064 Mar 6 06:59 su
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