Apple has released iTunes 9.2 for Windows systems to address multiple vulnerabilities affecting the ColorSync, ImageIO, and WebKit packages. These vulnerabilities may allow an attacker to execute arbitrary code or cause a denial-of-service condition.

US-CERT: http://www.us-cert.gov/current/index.html#apple_releases_itunes_9_2

Apple advisory: http://support.apple.com/kb/HT4220