Unspecified vulnerability in JustSystems Corporation ATOK 2006 through 2009 and ATOK flat-rate service, and Just Smile 4 with the ATOK Smile module, allows physically proximate users to bypass the screen lock and execute commands with system privileges via unknown vectors related to "launching external applications."
http://www.securityfocus.com/bid/36220
http://www.justsystems.com/jp/info/js09003.html
http://secunia.com/advisories/36560