Stack-based buffer overflow in the HandleAction function in RealPlayer 10.5 (6.0.12.1040) and earlier allows remote attackers to execute arbitrary code via a long ShowPreferences argument.
http://www.securityfocus.com/bid/12311
http://www.kb.cert.org/vuls/id/698390
http://service.real.com/help/faq/security/040928_player/EN/
http://marc.info/?l=bugtraq&m=110616636318261&w=2
http://marc.info/?l=bugtraq&m=109707741022291&w=2
http://archives.neohapsis.com/archives/ntbugtraq/2005-q1/0046.html