The startup script in packages/RedHat/ntop.init in ntop before 3.2, when ntop.conf is writable by users besides root, creates temporary files insecurely, which allows remote attackers to execute arbitrary code.
http://www.vupen.com/english/advisories/2005/2251
http://www.securityfocus.com/bid/15242
http://secunia.com/advisories/17382
http://listgateway.unipi.it/pipermail/ntop-dev/2005-March/005296.html