Apple iTunes before 8.1 does not properly inform the user about the origin of an authentication request, which makes it easier for remote podcast servers to trick a user into providing a username and password when subscribing to a crafted podcast.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5336
https://exchange.xforce.ibmcloud.com/vulnerabilities/49201
http://www.vupen.com/english/advisories/2009/0702
http://www.securityfocus.com/bid/34094
http://support.apple.com/kb/HT3487
http://securitytracker.com/id?1021843
http://secunia.com/advisories/34254
http://lists.apple.com/archives/security-announce//2009/Mar/msg00001.html