The remote host is vulnerable to a remote code execution attack.
According to its banner, the version of iTunes installed on the remote host is older than 9.0.1. Such versions are potentially affected by a remote buffer overflow when opening specially crafted '.pls' files. An attacker could exploit this flaw to execute arbitrary code on the remote host subject to the privileges of the user running the application.
Upgrade to iTunes 9.0.1 or later.