Stack-based buffer overflow in ppp in SCO Unixware 7.1.3 and 7.1.4, and possibly earlier versions, allows local users to execute arbitrary code via a long argument to the (1) prompt or (2) defprompt command.
http://www.securityfocus.com/bid/15159
http://www.idefense.com/application/poi/display?type=vulnerabilities
http://securitytracker.com/id?1015098