CoreServices in Apple Mac OS X 10.4.11 treats .ief as a safe file type, which allows remote attackers to force Safari users into opening an .ief file in AppleWorks, even when the "Open 'Safe' files" preference is set.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41312
http://www.vupen.com/english/advisories/2008/0924/references
http://www.us-cert.gov/cas/techalerts/TA08-079A.html
http://www.securitytracker.com/id?1019671
http://www.securityfocus.com/bid/28384
http://www.securityfocus.com/bid/28304
http://secunia.com/advisories/29420
http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html