apage.cgi in WebAPP 0.9.9.2.1, and possibly earlier versions, allows remote attackers to execute arbitrary commands via shell metacharacters in the f parameter.
http://www.vupen.com/english/advisories/2005/0554
http://www.soulblack.com.ar/repo/tools/sbwebapp.txt
http://www.securityfocus.com/archive/1/449573/100/200/threaded
http://www.securityfocus.com/archive/1/449517/100/200/threaded