SQL injection vulnerability in links/index.php in ATutor 1.5.3.1 and earlier allows remote authenticated users to execute arbitrary SQL commands via the (1) desc or (2) asc parameters.
https://www.exploit-db.com/exploits/2088
https://exchange.xforce.ibmcloud.com/vulnerabilities/28082
http://www.vupen.com/english/advisories/2006/3074
http://www.securityfocus.com/bid/19232
http://www.securityfocus.com/archive/1/441711/100/0/threaded
http://securityreason.com/securityalert/1330