This indicates an attack attempt against a buffer-overflow vulnerability in Apple itunes.
The vulnerability is caused by an error when the vulnerable software handles
an overly long itms uri. It allows a remote attacker to execute arbitrary code by tricking the user to visit a malicious url.
Apple iTunes versions prior to 8.2
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to Apple iTunes version 8.2 or later, available from the following web site: