WebKit in Apple Safari 3 Beta before Update 3.0.3, and iPhone before 1.0.1, does not properly handle the interaction between International Domain Name (IDN) support and Unicode fonts, which allows remote attackers to create a URL containing "look-alike characters" (homographs) and possibly perform phishing attacks.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35716
http://www.vupen.com/english/advisories/2007/2731
http://www.vupen.com/english/advisories/2007/2730
http://www.securitytracker.com/id?1018488
http://secunia.com/advisories/26287
http://isc.sans.org/diary.html?storyid=3214