source: https://www.securityfocus.com/bid/15221/info

ATutor is prone to multiple vulnerabilities.

These issues can allow remote attackers to execute arbitrary PHP commands and carry out local file include and cross-site scripting attacks.

ATutor 1.5.1-pl1 and prior versions are affected.

http://www.example.com/documentation/common/print.php?section=[file]%00