SaphpLesson 3.0 does not initialize array variables, which allows remote attackers to obtain the full path via an non-array (1) hrow parameter to (a) show.php or (b) index.php; the (2) Lsnrow parameter to (c) showcat.php; or the (3) rows parameter to index.php.
http://www.vupen.com/english/advisories/2006/1708
http://www.securityfocus.com/archive/1/433052/100/0/threaded