CoreFoundation, as used in Apple iTunes before 10.5, does not properly perform string tokenization, which allows man-in-the-middle attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via unspecified vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16919
http://www.securityfocus.com/bid/50067
http://support.apple.com/kb/HT5002
http://support.apple.com/kb/HT4999
http://support.apple.com/kb/HT4981
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00001.html
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00000.html